Issuse with refresh QWebEngineView

Question

i try reload an html file that i created with plotly with opening the app its loading but when i try to reload with a button my app stop working

class Window1(QWidget):
    def __init__(self):
        super().__init__()
        self.setGeometry(700, 350, 400, 400)
        self.setWindowTitle("Data Downloader")
        self.UI()
        # self.setWindowIcon(QtGui.QIcon("bs.jpg"))
    def UI(self):
        #self.plot_widget = QWebEngineView()
        self.dldata = QPushButton("Start", self)
        self.dldata.move(250, 25)
        self.dldata.clicked.connect(self.chartshow)
        self.browser = QWebEngineView(self)
        self.browser.move(1, 100)
        self.browser.setFixedWidth(400)
        self.browser.setFixedHeight(400)
        url = QUrl.fromLocalFile(r"\ht.html")
        self.browser.load(url)
    def chartshow(self):
        while 1 :
          self.browser.reload()
          time.sleep(10)
def main():
    app = QtWidgets.QApplication(sys.argv)
    window = Window1()
    window.show()
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()

I think there is something about qwidget or qmain window but I don't know how to fix that!