Positioning tool for zero setting of circular shell hollow shaft angular displacement potentiometer

Abstract

The utility model discloses a positioning tool for zero setting of a circular shell hollow shaft angular displacement potentiometer, which comprises a positioning base, a rotating shaft positioning rod, a shell positioning sleeve, a reset pressure spring, a reset ejector rod, a magnet mounting plate, a first magnet, a second magnet and a magnetic bolt, a non-circular positioning rod mounting hole is formed in the middle of the groove bottom of the potentiometer mounting sinking groove, a positioning rod mounting column at the lower end of the rotating shaft positioning rod is arranged in the positioning rod mounting hole, and rotating shaft positioning strips are arranged on the two opposite sides of the upper end of the rotating shaft positioning rod correspondingly; the shell positioning sleeve, the reset pressure spring, the reset ejector rod, the magnet mounting plate, the first magnet, the second magnet and the magnetic bolt jointly achieve the positioning function of the shell. According to the positioning tool, the rotating shaft and the shell of the circular shell hollow shaft angular displacement potentiometer can be quickly positioned and released respectively, the assembling and disassembling operation is simple, convenient, quick and reliable, and the assembling and disassembling efficiency is improved.

Description

Technical Field

[0001] The utility model relates to a positioning tool for zeroing an angular displacement potentiometer, in particular to a positioning tool for zeroing an angular displacement potentiometer with a circular shell and a hollow shaft. Background Art

[0002] With the miniaturization and informatization of products, electric servo mechanisms have occupied a major position in more and more servo control systems, and the angular displacement potentiometers for position feedback used in conjunction with them have also been widely used.

[0003] refer to Figure 1 The basic structure of the angular displacement potentiometer includes a housing 2, a rotating shaft 9, an insulating sleeve 6, a collector ring 5, a brush 3, a resistor 4 and a cover plate (the cover plate is not shown in the figure because the cover plate is not installed during the zero adjustment process before leaving the factory, and the cover plate is installed after zero adjustment. However, this application is aimed at improving the zero adjustment positioning tooling, so the cover plate is not shown in the figure). The rotating shaft 9 passes through the corresponding through hole on the housing 2 and is connected to the housing 2 through the bearing 7. The resistor 4 generally adopts a conductive plastic resistor and is installed in the housing 2. The insulating sleeve 6 is sleeved on the rotating shaft 9, the collector ring 5 is sleeved on the insulating sleeve 6, the brush 3 is installed on the collector ring 5 and contacts the resistor band of the resistor 4, and the inner end of the lead wire 1 is connected to the resistor 4. When in use, the rotating shaft 9 drives the brush 3 to contact and slide on the resistor band of the resistor 4, generating a changing electrical signal, which has a corresponding relationship with the rotation angle of the rotating shaft 9, thereby realizing the angular displacement detection function or the function of controlling the size of the output electrical signal through the angular displacement change.

[0004] The angular displacement potentiometer needs to be adjusted to the zero position (i.e., zeroed) before leaving the factory. Before starting the zeroing, the rotating shaft 9 and the housing 2 of the angular displacement potentiometer need to be positioned respectively, and then the collector ring 5 is rotated to drive the brush 3 to rotate. After rotating to the preset zero position, it is cured, and then the cover plate is installed to obtain the finished potentiometer.

[0005] For a potentiometer whose housing 2 has mounting ears, it is relatively easy to position the rotating shaft 9 and the housing 2 respectively. However, for an angular displacement potentiometer whose housing 2 is circular and has no other protruding parts such as mounting ears, it is difficult to effectively position the housing 2. Figure 1 The circular shell hollow shaft angular displacement potentiometer in the present invention has a circular shell 2 and no other protruding parts such as mounting ears. A shell screw hole 11 is provided on one side of the shell wall of the shell 2. The rotating shaft 9 is a hollow shaft and both ends of the rotating shaft 9 are exposed outside the shell 2. A rotating shaft boss 10 with a larger outer diameter is provided at one end of the rotating shaft 9, and opening grooves 8 are respectively provided on opposite sides of the circumferential wall of the other end of the rotating shaft 9.

[0006] The traditional method for positioning the above-mentioned circular shell hollow shaft angular displacement potentiometer before zeroing is to use different clamping components and screws to position the rotating shaft 9 and the shell 2 respectively, which has the following defects: it involves many clamping components, the loading and unloading operations are time-consuming and labor-intensive, the efficiency is low, and the application is inconvenient; the positioning before zeroing of other angular displacement potentiometers also requires screw connection, which also has the problem of being time-consuming and labor-intensive. Utility Model Content

[0007] The purpose of the utility model is to provide a positioning tool for zeroing a circular shell hollow shaft angular displacement potentiometer, which is convenient to operate and quick to connect, in order to solve the above problems.

[0008] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0009] A positioning tool for zeroing a circular shell hollow shaft angular displacement potentiometer, comprising a positioning base, a rotating shaft positioning rod, a shell positioning sleeve, a reset compression spring, a reset push rod, a magnet mounting plate, a first magnet, a second magnet and a magnetic latch, wherein a circular potentiometer mounting groove is provided on the top of the positioning base, a rotating shaft boss mounting groove is provided in the middle of the groove bottom of the potentiometer mounting groove, a non-circular positioning rod mounting hole is provided in the middle of the groove bottom of the rotating shaft boss mounting groove, and the positioning rod mounting hole extends downward to the lower surface of the positioning base, a non-circular positioning rod mounting column is provided at the lower end of the vertical and cylindrical rotating shaft positioning rod, the positioning rod mounting column is placed in the positioning rod mounting hole, and protruding rotating shaft positioning strips are respectively provided on opposite sides of the upper end of the rotating shaft positioning rod, and an upper end opening and a lower end sealing are provided on the positioning base near the potentiometer mounting groove. The first and second magnets are both mounted on the magnet mounting plate and arranged up and down. The upper ends of the reset compression spring and the reset ejector rod are both placed in the housing positioning sleeve and the reset compression spring enables the reset ejector rod to have a downward elastic force. The lower end of the reset ejector rod is placed outside the housing positioning sleeve and contacts with the bottom of the lower hole of the base countersunk hole. A transverse latch through hole is provided on the positioning base between the base countersunk hole and the potentiometer mounting groove. The magnetic latch is placed in the latch through hole. There is a mutually repelling transverse magnetic force between the first magnet and the magnetic latch, and there is a mutually attractive transverse magnetic force between the second magnet and the magnetic latch.

[0010] Preferably, in order to facilitate the automatic upward resetting of the outer shell positioning sleeve, the upper end of the reset push rod is provided with a push rod boss with an increased outer diameter, the reset push rod passes through the corresponding through hole at the lower end of the outer shell positioning sleeve, the lower end of the reset compression spring contacts the push rod boss, the upper end of the outer shell positioning sleeve is open and its inner wall is provided with an internal thread and a tightening screw is installed, and the upper end of the reset compression spring contacts the lower end of the tightening screw.

[0011] Preferably, in order to facilitate processing and assembly, a top plate is installed on the positioning base at a position above the base countersunk hole, and a vertical top plate through hole is provided on the top plate. The outer shell positioning sleeve passes through the top plate through hole, and the magnet mounting plate is located below the top plate and cannot pass through the top plate through hole from bottom to top.

[0012] Preferably, in order to facilitate the passage of the lead wire of the potentiometer, an open groove is provided on the side of the groove wall of the potentiometer installation groove opposite to the base countersunk hole.

[0013] The beneficial effects of the utility model are:

[0014] The utility model integrates a positioning base, a rotating shaft positioning rod, a housing positioning sleeve, a reset compression spring, a reset push rod, a magnet mounting plate, a first magnet, a second magnet and a magnetic latch to form an integral positioning tool. The rotating shaft positioning rod can be used to realize the functions of quickly positioning and releasing the positioning of the rotating shaft of the circular housing hollow shaft angular displacement potentiometer. By pressing and releasing the housing positioning sleeve, the first magnet and the second magnet can be driven to move vertically, thereby controlling the first magnet or the second magnet to correspond to the magnetic latch, thereby realizing the rapid control of the lateral movement of the magnetic latch, thereby realizing the functions of quickly positioning and releasing the positioning of the housing of the circular housing hollow shaft angular displacement potentiometer. Finally, a positioning tool is used to realize the functions of quickly positioning and releasing the positioning of the rotating shaft and the housing of the circular housing hollow shaft angular displacement potentiometer, respectively. The loading and unloading operations are simple, convenient, fast and reliable, and the assembly and disassembly efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the main cross-sectional structure of the circular shell hollow shaft angular displacement potentiometer of the utility model without the cover plate;

[0016] Figure 2 It is a schematic diagram of the main cross-sectional structure of the positioning tool used for zeroing the circular shell hollow shaft angular displacement potentiometer of the utility model;

[0017] Figure 3 It is a schematic diagram of the main structure of the rotating shaft positioning rod of the positioning tool used for zeroing the circular shell hollow shaft angular displacement potentiometer described in the utility model;

[0018] Figure 4It is a top view structural schematic diagram of a rotating shaft positioning rod of a positioning tool for zeroing a circular housing hollow shaft angular displacement potentiometer according to the utility model;

[0019] Figure 5 It is a bottom view structural schematic diagram of the rotating shaft positioning rod of the positioning tool used for zeroing the circular shell hollow shaft angular displacement potentiometer described in the utility model;

[0020] Figure 6 This is one of the main cross-sectional structural schematic diagrams of the positioning tooling used for zeroing the circular shell hollow shaft angular displacement potentiometer described in the utility model, in which the shell of the potentiometer is in a positioning state;

[0021] Figure 7 This is the second schematic diagram of the main cross-sectional structure of the positioning tooling used for zeroing the circular shell hollow shaft angular displacement potentiometer described in the utility model, in which the shell of the potentiometer is in a released positioning state. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings:

[0023] like Figure 2-Figure 5As shown, the positioning tool for zeroing the circular shell hollow shaft angular displacement potentiometer of the utility model comprises a positioning base 12, a shaft positioning rod 16, a shell positioning sleeve 24, a reset compression spring 26, a reset push rod 28, a magnet mounting plate 22, a first magnet 21, a second magnet 20 and a magnetic latch 18. A circular potentiometer mounting groove 14 is provided on the positioning base 12, a shaft boss mounting groove 15 is provided in the middle of the bottom of the groove of the potentiometer mounting groove 14, and the shaft boss mounting groove 15 is provided on the bottom of the groove of the potentiometer mounting groove 14. A non-circular (flat in the figure) positioning rod mounting hole (not marked in the figure) is provided in the middle of the bottom of the groove 15, and the positioning rod mounting hole extends downward to the lower surface of the positioning base 12, and a non-circular (flat in the figure) positioning rod mounting column 17 is provided at the lower end of the vertical and cylindrical rotating shaft positioning rod 16, and the positioning rod mounting column 17 is placed in the positioning rod mounting hole, and the upper ends of the rotating shaft positioning rod 16 are respectively provided with protruding rotating shaft positioning strips 29 on opposite sides, and the positioning base 12 is close to the electric A base countersunk hole (not marked in the figure) with an upper end open and a lower end closed is provided at the position of the potentiometer mounting groove 14. The magnet mounting plate 22 is connected to the shell positioning sleeve 24 provided with an inner cavity and both are placed in the base countersunk hole and the magnet mounting plate 22 is close to the potentiometer mounting groove 14. The first magnet 21 and the second magnet 20 are both mounted on the magnet mounting plate 22 and arranged up and down. The upper ends of the reset compression spring 26 and the reset push rod 28 are both placed in the shell positioning sleeve 24 and the reset compression spring 26 makes the reset push rod 28 have a downward elastic force. The lower end of the reset push rod 28 is placed outside the shell positioning sleeve 24 and contacts with the bottom of the lower hole of the base countersunk hole. A transverse latch through hole 19 is provided on the positioning base 12 at a position between the base countersunk hole and the potentiometer mounting groove 14. The magnetic latch 18 is placed in the latch through hole 19. There is a mutually repelling transverse magnetic force between the first magnet 21 and the magnetic latch 18, and there is a mutually attractive transverse magnetic force between the second magnet 20 and the magnetic latch 18.

[0024] like Figure 2-Figure 5 As shown, the utility model also discloses the following more optimized specific structures:

[0025] In order to facilitate the automatic upward reset of the outer shell positioning sleeve 24, the upper end of the reset push rod 28 is provided with a push rod boss 27 with an increased outer diameter. The reset push rod 28 passes through the corresponding through hole at the lower end of the outer shell positioning sleeve 24, and the lower end of the reset compression spring 26 contacts the push rod boss 27. The upper end of the outer shell positioning sleeve 24 is open and its inner wall is provided with an internal thread and a tightening screw 23 is installed. The upper end of the reset compression spring 26 contacts the lower end of the tightening screw 23.

[0026] To facilitate processing and assembly, a top plate 25 is installed on the positioning base 12 at a position above the base countersunk hole. The top plate 25 is provided with a vertical top plate through hole (not marked in the figure). The shell positioning sleeve 24 passes through the top plate through hole. The magnet mounting plate 22 is located below the top plate 25 and cannot pass through the top plate through hole from bottom to top.

[0027] In order to facilitate the lead wire 1 of the potentiometer to pass through, an opening groove 13 is provided on the side of the groove wall of the potentiometer installation groove 14 opposite to the base countersunk hole.

[0028] like Figure 1-Figure 7 As shown, when in use, first press the housing positioning sleeve 24 from top to bottom by hand, at this time the second magnet 20 and the magnetic latch 18 correspond to each other, the second magnet 20 attracts the magnetic latch 18 to move to a position close to each other, then place the circular housing hollow shaft angular displacement potentiometer in the potentiometer mounting groove 14, place the shaft boss 10 of the shaft 9 in the shaft boss mounting groove 15, align the housing screw hole 11 of the housing 2 of the circular housing hollow shaft angular displacement potentiometer with the latch through hole 19 on the positioning base 12, loosen the housing positioning sleeve 24, the housing positioning sleeve 24 is reset upward under the action of the reset compression spring 26, the first magnet 21 and the magnetic latch 18 correspond to each other, the first magnet 21 pushes the magnetic latch 18 to a position away from each other. The magnetic latch 18 is placed in the latch through hole 19 and the shell screw hole 11 at the same time (if the magnetic latch 18 does not directly enter the shell screw hole 11, the shell 2 is properly rotated until it can no longer rotate, which means that the magnetic latch 18 has entered the shell screw hole 11), so as to realize the positioning of the shell 2 of the circular shell hollow shaft angular displacement potentiometer; and then the lower end of the shaft positioning rod 16 is inserted from top to bottom into the central through hole of the shaft 9 of the circular shell hollow shaft angular displacement potentiometer until the positioning rod mounting column 17 is placed in the positioning rod mounting hole, and the two shaft positioning strips 29 on the shaft positioning rod 16 are respectively placed in the two open grooves 8 of the shaft 9, so as to realize the installation of the circular shell hollow shaft angular displacement potentiometer and the positioning of the shaft 9. In the above process, the shaft positioning rod 16 can also be installed first, and then the circular shell hollow shaft angular displacement potentiometer can be installed. After installation, the shaft 9 is first positioned, and then the shell 2 is rotated appropriately to align the shell screw hole 11 with the latch through hole 19. After the magnetic latch 18 is placed in the latch through hole 19 and the shell screw hole 11 at the same time, the shell 2 is positioned. After positioning is completed, the rotating collector ring 5 drives the brush 3 to rotate, and after rotating to the preset zero position, it is solidified, and then the cover plate is installed to obtain the finished potentiometer. When removing the potentiometer, first press the shell positioning sleeve 24 from top to bottom by hand, and the second magnet 20 attracts and moves the magnetic latch 18 to a position close to each other, and then the circular shell hollow shaft angular displacement potentiometer can be taken out from bottom to top, which is very convenient.

[0029] The above embodiments are only preferred embodiments of the present utility model and are not limitations on the technical solutions of the present utility model. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present utility model.

Claims

1. A positioning fixture for zeroing a circular hollow shaft angular displacement potentiometer, comprising a positioning base, characterized in that: It also includes a shaft positioning rod, a shell positioning sleeve, a reset compression spring, a reset push rod, a magnet mounting plate, a first magnet, a second magnet and a magnetic latch, wherein a circular potentiometer mounting groove is provided on the top of the positioning base, a shaft boss mounting groove is provided in the middle of the groove bottom of the potentiometer mounting groove, a non-circular positioning rod mounting hole is provided in the middle of the groove bottom of the shaft boss mounting groove, and the positioning rod mounting hole extends downward to the lower surface of the positioning base, a non-circular positioning rod mounting column is provided at the lower end of the vertical and cylindrical shaft positioning rod, the positioning rod mounting column is placed in the positioning rod mounting hole, and protruding shaft positioning strips are respectively provided on the opposite sides of the upper end of the shaft positioning rod, a base countersunk hole with an upper end opening and a lower end closed is provided on the positioning base near the potentiometer mounting groove, and the magnet mounting plate and the device The outer shell positioning sleeves with inner cavities are connected to each other and are both placed in the base countersunk holes and the magnet mounting plate is close to the potentiometer mounting groove. The first magnet and the second magnet are both mounted on the magnet mounting plate and arranged up and down. The upper ends of the reset compression spring and the reset push rod are both placed in the outer shell positioning sleeve and the reset compression spring enables the reset push rod to have a downward elastic force. The lower end of the reset push rod is placed outside the outer shell positioning sleeve and contacts with the bottom of the lower hole of the base countersunk hole. A transverse latch through hole is provided on the positioning base between the base countersunk hole and the potentiometer mounting groove. The magnetic latch is placed in the latch through hole. There is a mutually repulsive transverse magnetic force between the first magnet and the magnetic latch, and there is a mutually attractive transverse magnetic force between the second magnet and the magnetic latch.

2. The positioning fixture for zeroing the circular housing hollow shaft angular displacement potentiometer according to claim 1 is characterized in that: The upper end of the reset push rod is provided with a push rod boss with an increased outer diameter, and the reset push rod passes through the corresponding through hole at the lower end of the outer shell positioning sleeve, and the lower end of the reset compression spring contacts the push rod boss, the upper end of the outer shell positioning sleeve is open and its inner wall is provided with an internal thread and a tightening screw is installed, and the upper end of the reset compression spring contacts the lower end of the tightening screw.

3. The positioning fixture for zeroing the circular housing hollow shaft angular displacement potentiometer according to claim 2, characterized in that: A top plate is installed on the positioning base at a position above the base countersunk hole, and a vertical top plate through hole is provided on the top plate. The shell positioning sleeve passes through the top plate through hole, and the magnet mounting plate is located below the top plate and cannot pass through the top plate through hole from bottom to top.

4. The positioning fixture for zeroing the circular housing hollow shaft angular displacement potentiometer according to claim 1, 2 or 3, characterized in that: An open groove is provided on the side of the groove wall of the potentiometer installation groove opposite to the base countersunk hole.

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