Pressure plate position detection device of backstop

Abstract

The utility model provides a pressure plate position detection device of a backstop, the pressure plate position detection device is simple in structure, basically does not need maintenance, and is rapid and accurate in detection, the backstop comprises an input shaft and an output shaft which are directly or indirectly rotatably arranged on a casing, the output shaft is provided with a pressure plate which is matched with the output shaft in a spiral line, and when the pressure plate rotates relative to the output shaft, the pressure plate can rotate relative to the output shaft. The pressure plate axially moves left and right on the output shaft, a sliding ring which can rotate relative to the pressure plate but cannot axially move left and right is arranged on the periphery of the pressure plate, and an anti-rotation mechanism which can limit rotation of the sliding ring but cannot limit left and right movement of the sliding ring is arranged between the periphery of the sliding ring and the machine shell. An upper ball head at the upper end of the swing rod is hinged to the spherical hinge seat, the left side and the right side of a lower ball head at the lower end of the swing rod make contact with the inner walls of the left side and the right side of the groove in the sliding ring, and the lower ball head can vertically slide relative to the groove. A Hall sensor and a magnet which are opposite are arranged on the upper ball head and the machine shell opposite to the upper ball head, and the output of the Hall sensor is connected with a controller.

Description

Technical Field

[0001] This patent relates to a position detection device, specifically, a pressure plate position detection device for a backstop. Background Art

[0002] There are two types of backstops: one-way backstops and two-way backstops. A one-way backstop is a one-way backstop transmission mechanism that can drive the output shaft to rotate in the forward direction when the input shaft rotates in a certain direction, and can drive the output shaft to rotate in the reverse direction when the input shaft rotates in the opposite direction, but the output shaft cannot rotate in the reverse direction under the action of external force when the input shaft does not rotate.

[0003] A bidirectional check transmission mechanism refers to a bidirectional check transmission mechanism in which the output shaft can rotate in the forward direction when the input shaft rotates in a certain direction, and can drive the output shaft to rotate in the reverse direction when the input shaft rotates in the opposite direction. When the input shaft does not rotate, the output shaft cannot rotate in the forward or reverse direction under the action of external force.

[0004] The output shaft of the backstop is generally provided with a pressure plate that matches the output shaft in a spiral line, and the pressure plate moves left and right while rotating on the output shaft. In order to control the backstop, the axial position of the pressure plate needs to be detected.

[0005] The conventional pressure plate position detection device of the backstop adopts a travel switch, which has a complex installation structure, low detection accuracy, severe time delay and high maintenance cost. Summary of the invention

[0006] The purpose of this patent is to provide a pressure plate position detection device for a backstop, which has a simple structure, requires little maintenance, and has fast and accurate detection.

[0007] To achieve the above purpose, this patent adopts the following technical solutions:

[0008] A pressure plate position detection device for a backstop, the backstop comprises an input shaft and an output shaft which are directly or indirectly rotatably arranged on a casing, a pressure plate which is arranged on the output shaft and matches the output shaft with a spiral line, when the pressure plate rotates relative to the output shaft, the pressure plate moves axially left and right on the output shaft, a slip ring which can rotate relative to the pressure plate but cannot move axially left and right is arranged on the outer periphery of the pressure plate, an anti-rotation mechanism which can limit the rotation of the slip ring but cannot limit its left and right movement is arranged between the outer periphery of the slip ring and the casing, a ball joint seat is arranged on the casing, an upper ball head at the upper end of a swing rod is hinged to the ball joint seat, the left and right sides of the lower ball head at the lower end of the swing rod are in contact with the left and right inner walls of a groove on the slip ring, and the lower ball head can slide up and down relative to the groove; relative Hall sensors and magnets are arranged on the upper ball head and the casing opposite to the upper ball head, and the output of the Hall sensor is connected to a controller.

[0009] In the pressure plate position detection device of the above-mentioned backstop, the groove on the slip ring is a cylindrical hole with a circular cross-section, and the inner wall of the cylindrical hole contacts the lower ball head.

[0010] The pressure plate position detection device of the above-mentioned backstop, the anti-rotation mechanism includes an anti-rotation plate and an anti-rotation groove; a protruding anti-rotation plate is arranged on the outer periphery of the slip ring, and the anti-rotation plate extends into the anti-rotation groove located on the casing and extending parallel to the axis of the output shaft, or a protruding anti-rotation plate is arranged on the casing, and the anti-rotation plate extends into the anti-rotation groove located on the outer periphery of the slip ring and extending parallel to the axis of the output shaft.

[0011] The pressure plate position detection device of the backstop mentioned above has two opposite anti-rotation plates in the circumferential direction of the slip ring, and the rocker rod passes between the two anti-rotation plates.

[0012] The pressure plate position detection device of the above-mentioned backstop is provided with a Hall sensor on the top of the upper ball head, and a magnet opposite to the Hall sensor is provided on the casing, or a magnet is provided on the top of the upper ball head, and a Hall sensor opposite to the magnet is provided on the casing.

[0013] In the pressure plate position detection device of the backstop mentioned above, the left and right sides of the slip ring and the left and right sides of the pressure plate have matching annular grooves and flanges.

[0014] In the pressure plate position detection device of the above-mentioned backstop, the slip ring is semi-annular.

[0015] Beneficial effects of this patent:

[0016] When the pressure plate rotates relative to the output shaft, the slip ring cannot rotate due to the anti-rotation mechanism between the slip ring and the housing (such as the anti-rotation plate on the slip ring extending into the anti-rotation groove on the housing extending parallel to the axis of the output shaft), but the slip ring can move left and right with the pressure plate relative to the housing. When the slip ring moves left and right, the lower ball head of the swing arm moves left and right with the slip ring and slides up and down relative to the groove, and the upper ball head of the swing arm swings left and right around the center of the upper ball head, so that the relative position or angle between the Hall sensor and the magnet changes, resulting in a change in the output electrical signal of the Hall sensor. The controller can determine the axial position of the pressure plate relative to the output shaft based on the electrical signal of the inserted Hall sensor.

[0017] Hall sensors, controllers, etc. belong to the prior art. They basically do not require maintenance during use, have accurate detection, and are easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of a pressure plate position detection device of a backstop, etc.;

[0019] Figure 2 It is a schematic diagram of the housing, pendulum, sensor housing, etc.;

[0020] Figure 3 It is a schematic diagram of the relative relationship between the pendulum rod, sensor housing, slip ring, etc.;

[0021] Figure 4 It is a schematic diagram of the relative relationship between the slip ring, pressure plate, anti-rotation plate, etc.

[0022] Figure 5 This is a schematic diagram of a slip ring.

[0023] Figure 6 It is a schematic diagram of the pressure plate. DETAILED DESCRIPTION

[0024] See also Figure 1 As shown, the backstop includes an input shaft 11 rotatably arranged on a one-way sleeve 12 and an output shaft 21 rotatably arranged on a one-way sleeve 22. The one-way sleeve 12 is rotatably arranged on the housing through a one-way bearing 13, and the one-way sleeve 22 is rotatably arranged on the housing through a one-way bearing 23. The one-way sleeve 12 and the one-way sleeve 22 can rotate in opposite directions relative to the housing. A pressure plate seat 15 is arranged on the output shaft 21 and is matched with the output shaft in a spiral line. The pressure plate 3 is fixed on the outer periphery of the pressure plate seat 15. When the pressure plate seat 15 rotates relative to the output shaft 21 under the action of other components in the backstop, the pressure plate seat 15 and the pressure plate 3 move axially left and right on the output shaft 2, which belongs to the prior art.

[0025] The pressure plate position detection device of the backstop includes a slip ring 4, a rocker rod 7, a magnet 8, a Hall sensor 9, a controller, etc.

[0026] An annular groove 31 centered on the axis of the output shaft is formed on the inner walls of the left and right side walls of the pressure plate 3 .

[0027] The left and right flanges 41 of the semi-annular slip ring 4 are slidably disposed in the annular groove 31 .

[0028] Two protruding anti-rotation plates 5 are arranged on the outer periphery of the slip ring, and the anti-rotation plates extend into anti-rotation grooves 61 on the housing 6 and extending parallel to the axis of the output shaft. The sensor housing 63 is fixed on the housing 6.

[0029] The swing rod 7 passes through between the two anti-rotation plates 5. The upper ball head 71 at the upper end of the swing rod 7 is hinged to the ball joint seat 62 arranged on the sensor housing 63, and the lower ball head 72 at the lower end of the swing rod extends into the cylindrical hole 42 with a circular cross section opened on the slip ring. The inner wall of the cylindrical hole 42 contacts the lower ball head 72, and the lower ball head 72 can slide up and down relative to the cylindrical hole 42.

[0030] A magnet 8 is embedded in the top of the upper ball head 71, and a Hall sensor 9 opposite to the magnet 8 is arranged on the sensor housing 63. The output of the Hall sensor is connected to the controller.

[0031] The utility model is a pressure plate position detection structure of a backstop, which is used to detect the real-time axial position of the pressure plate in the backstop. A slip ring that moves axially with the pressure plate is arranged in the mechanism, a structure for preventing the slip ring from rotating is arranged between the slip ring and the stationary casing (the slip ring is provided with an anti-rotation plate, the casing is provided with a corresponding anti-rotation groove, or vice versa), and a structure that can rotate but cannot move axially relative to the pressure plate is arranged between the slip ring and the pressure plate (a partial flange of the slip ring is embedded in the annular groove on the pressure plate, or vice versa, or the slip ring is embedded in the annular groove of the pressure plate as a whole). A groove or concave hole that matches with the lower ball head of the swing rod is arranged on the slip ring, and the upper ball head of the swing rod is hinged in the sensor housing. The movement of the slip ring drives the swing rod to swing, so that the direction of the magnetic force lines of the magnet on the swing rod changes relative to the angle of the sensor Hall chip. The sensor chip detects the direction of the magnetic force lines to detect the axial position of the pressure plate.

Claims

1. A pressure plate position detection device for a backstop, wherein the backstop comprises an input shaft and an output shaft which are directly or indirectly rotatably arranged on a housing, and a pressure plate which is matched with the output shaft in a spiral line is arranged on the output shaft. When the pressure plate rotates relative to the output shaft, the pressure plate moves axially left and right on the output shaft, and is characterized in that: A slip ring is arranged on the periphery of the pressure plate, which can rotate relative to the pressure plate but cannot move axially left and right. An anti-rotation mechanism is arranged between the periphery of the slip ring and the casing, which can limit the rotation of the slip ring but cannot limit its left and right movement. A ball joint seat is arranged on the casing, an upper ball head at the upper end of the swing rod is hinged to the ball joint seat, and the left and right sides of the lower ball head at the lower end of the swing rod are in contact with the left and right inner walls of the groove on the slip ring, and the lower ball head can slide up and down relative to the groove; relative Hall sensors and magnets are arranged on the upper ball head and the casing opposite to the upper ball head, and the output of the Hall sensor is connected to the controller.

2. The pressure plate position detection device of the backstop according to claim 1, characterized in that: The groove on the slip ring is a cylindrical hole with a circular cross section, and the inner wall of the cylindrical hole contacts the lower ball head.

3. The pressure plate position detection device of the backstop according to claim 1, characterized in that: The anti-rotation mechanism includes an anti-rotation plate and an anti-rotation groove; a protruding anti-rotation plate is arranged on the outer periphery of the slip ring, and the anti-rotation plate extends into the anti-rotation groove located on the housing and extending parallel to the axis of the output shaft, or a protruding anti-rotation plate is arranged on the housing, and the anti-rotation plate extends into the anti-rotation groove located on the outer periphery of the slip ring and extending parallel to the axis of the output shaft.

4. The pressure plate position detection device of the backstop according to claim 3, characterized in that: There are two opposite anti-rotation plates in the circumferential direction of the slip ring, and the rocker rod passes between the two anti-rotation plates.

5. The pressure plate position detection device of the backstop according to claim 1, characterized in that: A Hall sensor is arranged on the top of the upper ball head, and a magnet opposite to the Hall sensor is arranged on the casing. Alternatively, a magnet is arranged on the top of the upper ball head, and a Hall sensor opposite to the magnet is arranged on the casing.

6. The pressure plate position detection device of the backstop according to claim 1, characterized in that: The left and right sides of the slip ring and the left and right sides of the pressure plate are provided with matching annular grooves and flanges.

7. The pressure plate position detection device of the backstop according to claim 1, characterized in that: The slip ring is semi-annular.

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