Arm length control device for force arm regulator

Abstract

The invention provides an arm length control device for a force arm regulator, and belongs to the technical field of force arm regulators, the arm length control device specifically comprises a shell, a first switch and a second switch are arranged in the shell, and a driving mechanism is closed after contacts of the first switch and the second switch are pressed; a guide rail; the sliding block is fixedly connected with the output shaft; a pressing block is fixed to the movable rod, one end of the pressing block is located between contacts of the first switch and the second switch, a first check block and a second check block are fixed to the movable rod, and the sliding block and the pressing block are both located between the first check block and the second check block; the sliding block moves along with stretching and retracting of the output shaft, the sliding block moves in the first direction to push the first check block to move till the pressing block presses a contact of the first switch, and the sliding block moves in the second direction to push the second check block to move till the pressing block presses a contact of the second switch. Large-range arm length adjustment can be guaranteed in a limited space, and the reliability of the arm length of the control force arm is improved.

Description

Technical Field

[0001] The present application relates to the field of a lever arm adjuster, and in particular to an arm length control device for a lever arm adjuster. Background Art

[0002] At present, in order to ensure that the aircraft has relatively consistent control performance at different flight speeds and different flight altitudes, the transmission ratio of the joystick to the spring load mechanism and the rudder surface is adjusted by changing the arm size of the lever adjuster, so that the pilot has a consistent control feeling, reduces the burden on the pilot, achieves better human-machine efficiency, and increases the safety of aircraft control. At present, the linear lever adjuster usually adopts a reducer, and the screw drives the cone pin or cam to directly press the micro switch with a spring sheet, which plays the power-off function of the lever adjuster, thereby outputting different arm lengths. This method will be found during use. Because the position of the cone pin or cam pressing the micro switch spring sheet is not easy to control, it will change due to the change of the operator, the arm length adjustment range is small, and the elastic force of the cantilever spring sheet changes after long-term work, affecting the size of the entire arm length. The inertial sliding of the lever adjuster strengthens the impact on the switch, which greatly reduces the life of the entire micro switch and affects the reliability of the mission. Summary of the invention

[0003] In view of this, the present application provides an arm length control device for a lever arm adjuster, which solves the problems in the prior art, can ensure a wide range of arm length adjustment in a limited space, and improves the reliability of controlling the lever arm length.

[0004] The arm length control device for a lever arm adjuster provided in the present application adopts the following technical solution:

[0005] An arm length control device for a lever arm adjuster, the lever arm adjuster comprises a driving mechanism, an output shaft and a lever arm, the driving mechanism is used to drive the output shaft to extend and retract, the lever arm is connected to the extension shaft, the lever arm drives the lever arm to extend and retract, and the arm length control device comprises:

[0006] A housing is fixedly arranged relative to the outer shell of the lever arm adjuster, wherein a first switch and a second switch are arranged in the housing, wherein contacts of the first switch and the second switch are arranged opposite to each other, wherein the first switch and the second switch are both electrically connected to the driving mechanism, and wherein the driving mechanism is turned off when the contacts of the first switch and the second switch are pressed;

[0007] A guide rail is fixed in the housing, wherein the length direction of the guide rail is parallel to the extension direction of the output shaft;

[0008] A slider is slidably disposed on the guide rail, and the slider is fixedly connected to the output shaft;

[0009] A movable rod is slidably mounted on the housing, wherein the sliding direction of the movable rod is parallel to the telescopic direction of the output shaft, a pressure block is fixed on the movable rod, one end of the pressure block is located between the contacts of the first switch and the second switch, a first block and a second block are fixed on the movable rod, the slider and the pressure block are both located between the first block and the second block, the slider is used to abut against one end of the first block toward the second block, and the slider is used to abut against one end of the second block toward the first block;

[0010] The slider moves with the extension and retraction of the output shaft. The slider moves in a first direction to push the first stopper until the pressure block presses the contact of the first switch. The slider moves in a second direction to push the second stopper until the pressure block presses the contact of the second switch.

[0011] Optionally, when there are gaps between the slider and the first stopper and between the slider and the second stopper, one side of the pressing block contacts the contact of the first switch, and the other side of the pressing block contacts the second switch, and the force exerted by the pressing block on the first switch and the second switch is less than the force exerted on successfully pressing the contact;

[0012] The distance between the opposite end faces of the first stopper and the second stopper is a, the distance b between the end faces of the first stopper and the second stopper used for abutting the slider, and the lever arm stroke of the lever arm adjuster is L, L=ba.

[0013] Optionally, the movable rod and the shell are slidably matched, and the shell is provided with an elastic component connected to the movable rod. When the slider applies a force to the first stop block, the elastic component has a force on the movable rod to move the pressure block away from the first switch contact. When the slider applies a force to the second stop block, the elastic component has a force on the movable rod to move the pressure block away from the second switch contact.

[0014] Optionally, the elastic component includes a fixed shaft, a first bushing, a second bushing, a first sleeve, a second sleeve, a connecting rod and a first spring, one end of the fixed shaft is fixed to the housing, the length direction of the fixed shaft is parallel to the length direction of the guide rail, the first bushing and the second bushing are slidably sleeved on the fixed shaft, the first sleeve is slidably sleeved on the outer periphery of the first bushing, the second sleeve is slidably sleeved on the outer periphery of the second bushing, the outer walls of the first sleeve and the second sleeve are connected by a connecting rod, the connecting rod is fixedly connected to the movable rod, and the first spring is sleeved on the outer periphery of the fixed shaft;

[0015] The first bushing is located on one end of the fixed shaft connecting housing, and the second bushing is located on the other end of the fixed shaft. The fixed shaft is provided with a limit ring that abuts against one end of the second bushing away from the first bushing, and the limit ring limits the displacement of the second bushing in a direction away from the first bushing. The end of the first bushing close to the second bushing is provided with a first ring stage, and the first ring stage abuts against the end surface of the first sleeve facing the second sleeve. The end of the second bushing close to the first bushing is provided with a second ring stage, and the second ring stage abuts against the end surface of the second sleeve facing the first sleeve.

[0016] The first spring is located between the first sleeve and the second sleeve, one end of the first spring is sleeved on the outer periphery of the end of the first bushing close to the second bushing, the other end of the first spring is sleeved on the outer periphery of the end of the second bushing close to the first bushing, and two end surfaces of the first spring abut against the opposite end surfaces of the first ring platform and the second ring platform;

[0017] When the slider applies pressure to the first stopper, the second sleeve drives the second bushing to move toward the side away from the limiting ring, and the end of the first bushing away from the second bushing abuts against the shell, and the second ring stage applies pressure to the first spring to compress the first spring; when the slider applies pressure to the second stopper, the first sleeve drives the first bushing to move toward the side close to the limiting ring, and the second bushing abuts against the limiting ring, and the first ring stage applies pressure to the first spring to compress the first spring.

[0018] Optionally, two opposite connecting plates are provided on the connecting rod, one side of the two connecting plates is connected to the connecting rod, the two connecting plates are spaced apart, and through grooves are provided on the opposite sides of the two connecting plates, the through grooves of the two connecting plates are combined into matching holes for the movable rod to pass through, and the two connecting plates are fixedly connected by bolts at one end away from the connecting rod so that the two connecting plates clamp the movable rod.

[0019] Optionally, the pressing block includes a first fixed block and a second fixed block that are fixed on the movable rod and arranged opposite to each other, and a receiving groove is provided on opposite sides of the first fixed block and the second fixed block, and the receiving grooves of the first fixed block and the second fixed block are connected to form a cavity structure, and a second spring is provided in the cavity structure, and the first fixed block is provided with a first sliding hole connected to the receiving groove, and the second fixed block is provided with a second sliding hole connected to the receiving groove, a first pressing rod is provided for sliding in the first sliding hole, and a second pressing rod is provided for sliding in the second sliding hole, the first pressing rod is used to press the first switch, and the second pressing rod is used to press the second switch, the opposite ends of the first pressing rod and the second pressing rod are located in the receiving groove, and an abutment ring is provided on the end of the receiving groove of the first pressing rod and the second pressing rod, the second spring is located between the two abutment rings, the end face of the second spring abuts the two abutment rings, and the ends of the first pressing rod and the second pressing rod close to each other extend into the second spring.

[0020] Optionally, the first fixing block and the second fixing block are connected by bolts.

[0021] In summary, this application includes the following beneficial technical effects:

[0022] It can ensure a wide range of arm length adjustment in a limited space, and ensure that each press is in the same position, can work for a long time, avoid hard contact when pressing the switch, greatly alleviate the impact damage of the motor inertial slip on the switch, and achieve rapid rebound during reversing. It is easy to debug and has a simple structure, so as to reliably and accurately control the arm length of the large and small arms. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 This is a structural schematic diagram of the lever arm regulator of an embodiment of the present application;

[0025] Figure 2 This is a schematic diagram of the structure of the arm length control device of this application;

[0026] Figure 3 This is a schematic diagram of the structure of the elastic component of this application;

[0027] Figure 4 This is a schematic diagram of the structure of the first sleeve, the second sleeve and the connecting rod of the present application;

[0028] Figure 5This is a schematic diagram of the structure of the briquette for this application.

[0029] Explanation of the accompanying drawings: 1. driving mechanism; 11. output shaft; 12. lever arm; 13. transmission mechanism; 2. housing; 21. first switch; 22. second switch; 3. guide rail; 4. slider; 5. movable rod; 51. first stop block; 52. second stop block; 53. clamping ring; 6. pressure block; 61. first fixed block; 62. second fixed block; 63. second spring; 64. first pressing rod; 65. second pressing rod; 66. abutting ring platform; 7. elastic component; 71. fixed shaft; 72. first bushing; 721. first ring platform; 73. second bushing; 731. second ring platform; 732. limiting ring; 74. first sleeve; 75. second sleeve; 76. connecting rod; 761. connecting plate; 762. through groove; 77. first spring. DETAILED DESCRIPTION

[0030] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0031] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0032] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0033] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The illustrations only show the components related to the present application rather than being drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0034] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects described may be practiced without these specific details.

[0035] An embodiment of the present application provides an arm length control device for a lever arm adjuster.

[0036] like Figure 1 As shown, the lever arm adjuster includes a driving mechanism 1, an output shaft 11 and a lever arm 12. The driving mechanism 1 is used to drive the output shaft 11 to extend and retract. The driving mechanism 1 includes a motor. The output end of the motor is connected to the output shaft 11 through a transmission mechanism 13. When the motor is started, the output shaft 11 is driven to extend and retract through the transmission mechanism 13. The lever arm 12 is connected to the output shaft 11, and the lever arm 12 drives the lever arm 12 to extend and retract.

[0037] like Figure 2 As shown, an arm length control device for a lever arm adjuster comprises:

[0038] The housing 2 is fixedly arranged relative to the housing of the lever arm adjuster, and a first switch 21 and a second switch 22 are arranged in the housing 2. The contacts of the first switch 21 and the second switch 22 are arranged opposite to each other, and the first switch 21 and the second switch 22 are both electrically connected to the drive mechanism 1. When the contacts of the first switch 21 and the second switch 22 are pressed, the drive mechanism 1 is turned off. In the embodiment of the present application, the housing 2 is fixed in the housing of the lever arm adjuster.

[0039] The guide rail 3 is fixed in the housing 2 , and the length direction of the guide rail 3 is parallel to the extension direction of the output shaft 11 .

[0040] The slider 4 is slidably disposed on the guide rail 3 , and the slider 4 is fixedly connected to the output shaft 11 .

[0041] The movable rod 5 is slidably installed on the shell 2, and the sliding direction of the movable rod 5 is parallel to the extension and retraction direction of the output shaft 11. A pressure block 6 is fixed on the movable rod 5, and one end of the pressure block 6 is located between the contacts of the first switch 21 and the second switch 22. A first block 51 and a second block 52 are fixed on the movable rod 5. The slider 4 and the pressure block 6 are both located between the first block 51 and the second block 52. The slider 4 is used to abut one end of the first block 51 toward the second block 52, and the slider 4 is used to abut one end of the second block 52 toward the first block 51.

[0042] The slider 4 moves as the output shaft 11 extends and retracts. The slider 4 moves in a first direction to push the first stop block 51 until the pressure block 6 presses the contact of the first switch 21 . The slider 4 moves in a second direction to push the second stop block 52 until the pressure block 6 presses the contact of the second switch 22 .

[0043] In the present application, the arm length control device as a whole is in the shape along the length direction of the output shaft 11, and there is no need to set a reducer to cooperate with the cam structure. Moreover, the slider 4 and the pressure block 6 that control the first switch 21 and the second switch 22 are moved along the extension and retraction direction of the output shaft 11. The formation of the slider 4 can fully utilize the space in the length direction of the arm adjuster, and the stroke of the slider 4 is large, thereby increasing the range of arm length control.

[0044] When there are gaps between the slider 4 and the first stopper 51 and between the slider 4 and the second stopper 52, one side of the pressing block 6 contacts the contact of the first switch 21, and the other side of the pressing block 6 contacts the second switch 22, and the force exerted by the pressing block 6 on the first switch 21 and the second switch 22 is less than the force for successfully pressing the contacts, that is, when there are gaps between the slider 4 and the first stopper 51 and between the slider 4 and the second stopper 52, the pressing block 6 contacts the first switch 21 and the second switch 22, but there is no pressing force on the first switch 21 and the second switch 22, and the first switch 21 and the second switch 22 are not successfully pressed; the distance between the opposite end faces of the first stopper 51 and the second stopper 52 is a, the distance between the end faces of the slider 4 used to abut the first stopper 51 and the second stopper 52 is b, and the stroke of the force arm 12 of the force arm adjuster is L, L=ba. The travel of the slider 4 and the lever arm 12 is almost the same. When the lever arm 12 is extended to the maximum length, the slider 4 moves to the position of the second stopper 52, the slider 4 abuts and applies pressure to the second stopper 52, the pressure block 6 presses the second switch 22, and the drive mechanism 1 stops; when the lever arm 12 is retracted to the minimum length, the slider 4 moves to the position of the first stopper 51, the slider 4 abuts and applies pressure to the first stopper 51, the pressure block 6 presses the first switch 21, and the drive mechanism 1 stops. In the process of controlling the lever arm 12, the first stopper 51, the second stopper 52 and the pressure block 6 only move slightly, the travel is short, and the reliability is higher.

[0045] like Figure 2 and Figure 3 As shown, both ends of the movable rod 5 are slidably matched with the housing 2, and an elastic component 7 connected to the movable rod 5 is provided on the housing 2. When the slider 4 applies a force to the first stopper 51, the elastic component 7 has a force on the movable rod 5 to make the pressing block 6 away from the contact of the first switch 21. When the slider 4 applies a force to the second stopper 52, the elastic component 7 has a force on the movable rod 5 to make the pressing block 6 away from the contact of the second switch 22. The setting of the elastic component 7 can quickly reset the pressing block 6 and the first switch 21 and the second switch 22 after the slider 4 and the first stopper 51 or the slider 4 and the second stopper 52 are separated.

[0046] like Figure 3As shown, the elastic component 7 includes a fixed shaft 71, a first bushing 72, a second bushing 73, a first sleeve 74, a second sleeve 75, a connecting rod 76 and a first spring 77. One end of the fixed shaft 71 is fixed to the housing 2, and the length direction of the fixed shaft 71 is parallel to the length direction of the guide rail 3. The first bushing 72 and the second bushing 73 are slidably sleeved on the fixed shaft 71, the first sleeve 74 is slidably sleeved on the outer periphery of the first bushing 72, and the second sleeve 75 is slidably sleeved on the outer periphery of the second bushing 73. The outer walls of the first sleeve 74 and the second sleeve 75 are connected by a connecting rod 76, and the connecting rod 76 is fixedly connected to the movable rod 5. The first spring 77 is sleeved on the outer periphery of the fixed shaft 71; the first bushing 72 is located on one end of the fixed shaft 71 connected to the housing 2, and the second bushing 73 is located on the other end of the fixed shaft 71. The fixed shaft 71 is provided with a second bushing 73 away from the first One end of the bushing 72 abuts against a limit ring 732, and the limit ring 732 limits the displacement of the second bushing 73 in the direction away from the first bushing 72. A first ring stage 721 is provided at the end of the first bushing 72 close to the second bushing 73, and the first ring stage 721 abuts against the end surface of the first sleeve 74 facing the second sleeve 75. A second ring stage 731 is provided at the end of the second bushing 73 close to the first bushing 72, and the second ring stage 731 abuts against the end surface of the second sleeve 75 facing the first sleeve 74. The first spring 77 is located between the first sleeve 74 and the second sleeve 75. One end of the first spring 77 is sleeved on the outer periphery of the end of the first bushing 72 close to the second bushing 73, and the other end of the first spring 77 is sleeved on the outer periphery of the end of the second bushing 73 close to the first bushing 72. The two end surfaces of the first spring 77 abut against the opposite end surfaces of the first ring stage 721 and the second ring stage 731.

[0047] When the slider 4 applies pressure to the first stopper 51, the second sleeve 75 drives the second bushing 73 to move away from the limiting ring 732, and the second ring stage 731 pushes the first spring 77 to move away from the limiting ring 732. At the same time, it pushes the first bushing 72 to move so that the end of the first bushing 72 away from the second bushing 73 abuts against the housing 2, and the end of the first spring 77 abuts against the first ring stage 721 and cannot continue to move. The second ring stage 731 continues to apply pressure to the first spring 77 to compress the first spring 77. When the slider 4 applies pressure to the second stopper 52, the first sleeve 74 drives the first bushing 72 to move toward the side close to the stop ring 732, and the first ring stage 721 pushes the first spring 77 to move toward the side close to the stop ring 732, and at the same time pushes the second bushing 73 to move, so that the end of the second bushing 73 away from the first bushing 72 abuts against the stop ring 732, and the end of the first spring 77 abutting against the first ring stage 721 cannot continue to move, and the first ring stage 721 continues to apply pressure to the first spring 77 to compress the first spring 77. When the slider 4 moves and separates from the first stopper 51 or the second stopper 52, the first spring 77 resets and extends, driving the movable rod 5 and the pressure block 6 to reset.

[0048] In the embodiment of the present application, when the slider 4 does not contact the first stopper 51 and the second stopper 52, the first bushing 72 abuts against the housing 2, and the second bushing 73 abuts against the limit ring 732, so that the initial state of the first spring 77 is a compressed state, which can effectively ensure the stability of the movable rod 5 when the slider 4 does not contact the first stopper 51 and the second stopper 52, and prevent the movable rod 5 from shaking randomly and causing the pressure block 6 to accidentally touch the first switch 21 or the second switch 22. When the slider 4 applies pressure to the first stopper 51 and the second stopper 52, the first spring 77 is compressed, and when the slider 4 leaves the first stopper 51 and the second stopper 52 and applies pressure, the first spring 77 is reset.

[0049] like Figure 3 and Figure 4 As shown, two opposite connecting plates 761 are provided on the connecting rod 76, one side of the two connecting plates 761 is connected to the connecting rod 76, the two connecting plates 761 are spaced apart, and through grooves 762 are provided on the opposite sides of the two connecting plates 761, the through grooves 762 of the two connecting plates 761 are combined into matching holes for the movable rod 5 to pass through, and the ends of the two connecting plates 761 away from the connecting rod 76 are fixedly connected by bolts so that the two connecting plates 761 clamp the movable rod 5.

[0050] like Figure 2 and Figure 5As shown, the pressing block 6 includes a first fixed block 61 and a second fixed block 62 fixed on the movable rod 5 and arranged opposite to each other, and a receiving groove is provided on the opposite sides of the first fixed block 61 and the second fixed block 62. The receiving grooves of the first fixed block 61 and the second fixed block 62 are connected to form a cavity structure, and a second spring 63 is provided in the cavity structure. The first fixed block 61 is provided with a first sliding hole connected to the receiving groove, and the second fixed block 62 is provided with a second sliding hole connected to the receiving groove. A first pressing rod 64 is provided to slide in the first sliding hole, and a second pressing rod 65 is provided to slide in the second sliding hole. The end of the first pressing rod 64 away from the receiving groove extends out of the first sliding hole for pressing the first switch 21, and the end of the second pressing rod 65 away from the receiving groove extends out of the second sliding hole for pressing the second switch 22. The opposite ends of the first pressing rod 64 and the second pressing rod 65 are located in the receiving groove. The ends of the receiving grooves of the first pressing rod 64 and the second pressing rod 65 are provided with abutment rings 66. The second spring 63 is located between the two abutment rings 66. The end surface of the second spring 63 abuts the two abutment rings 66. The ends of the first pressing rod 64 and the second pressing rod 65 close to each other extend into the second spring 63. Before the second spring 63 is compressed to the limit position, the elastic force generated is greater than the elastic force of the spring sheets of the first switch 21 and the second switch 22, so that the second spring 63 can provide sufficient force to successfully press the first switch 21 and the second switch 22. The second spring 63 enables the first pressing rod 64 to achieve soft contact with the first switch 21 and the second pressing rod 65 to achieve soft contact with the second switch 22, thereby avoiding excessive force on the switches that may damage the switches and extending the service life of the first switch 21 and the second switch 22.

[0051] The first fixing block 61 and the second fixing block 62 are connected by bolts, and holes matching with the movable rod 5 are provided on the first fixing block 61 and the second fixing block 62, and the movable rod 5 is provided with a clamping groove on the opposite sides of the first fixing block 61 and the second fixing block 62, and a clamping ring 53 is provided in the clamping groove, and the two clamping rings 53 fix the pressing block 6 on the movable rod 5.

[0052] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. An arm length control device for a lever arm adjuster, the lever arm adjuster comprising a driving mechanism (1), an output shaft (11) and a lever arm (12), the driving mechanism (1) being used to drive the output shaft (11) to extend and retract, the lever arm (12) being connected to the extension shaft, the lever arm (12) driving the lever arm (12) to extend and retract, characterized in that: The arm length control device includes: A housing (2) is fixedly arranged relative to the outer shell of the lever arm adjuster, a first switch (21) and a second switch (22) are arranged in the housing (2), contacts of the first switch (21) and the second switch (22) are arranged opposite to each other, the first switch (21) and the second switch (22) are both electrically connected to the driving mechanism (1), and the driving mechanism (1) is turned off when the contacts of the first switch (21) and the second switch (22) are pressed; A guide rail (3) is fixed in the housing (2), and the length direction of the guide rail (3) is parallel to the extension direction of the output shaft (11); A slider (4) is slidably disposed on the guide rail (3), and the slider (4) and the output shaft (11) are fixedly connected; A movable rod (5) is slidably mounted on the housing (2); the sliding direction of the movable rod (5) is parallel to the telescopic direction of the output shaft (11); a pressure block (6) is fixed on the movable rod (5); one end of the pressure block (6) is located between the contacts of the first switch (21) and the second switch (22); a first stop block (51) and a second stop block (52) are fixed on the movable rod (5); the slider (4) and the pressure block (6) are both located between the first stop block (51) and the second stop block (52); the slider (4) is used to abut against one end of the first stop block (51) facing the second stop block (52); and the slider (4) is used to abut against one end of the second stop block (52) facing the first stop block (51); The slider (4) moves as the output shaft (11) expands and contracts; the slider (4) moves in a first direction to push the first stopper (51) until the pressure block (6) presses the contact of the first switch (21); the slider (4) moves in a second direction to push the second stopper (52) until the pressure block (6) presses the contact of the second switch (22).

2. The arm length control device for the lever arm adjuster according to claim 1, characterized in that: When there are gaps between the slider (4) and the first stopper (51), and between the slider (4) and the second stopper (52), one side of the pressing block (6) contacts the contact of the first switch (21), and the other side of the pressing block (6) contacts the second switch (22), and the force exerted by the pressing block (6) on the first switch (21) and the second switch (22) is less than the force exerted on the contact successfully; The distance between the opposite end faces of the first stopper (51) and the second stopper (52) is a, the distance b between the end faces of the first stopper (51) and the second stopper (52) used for abutting the slider (4) is a, and the stroke of the force arm (12) of the force arm adjuster is L, L=ba.

3. The arm length control device for the lever arm adjuster according to claim 2, characterized in that: The movable rod (5) and the housing (2) are slidably matched, and an elastic component (7) connected to the movable rod (5) is provided on the housing (2); when the slider (4) applies a force to the first stopper (51), the elastic component (7) has a force on the movable rod (5) to move the pressing block (6) away from the contact of the first switch (21); when the slider (4) applies a force to the second stopper (52), the elastic component (7) has a force on the movable rod (5) to move the pressing block (6) away from the contact of the second switch (22).

4. The arm length control device for the lever arm adjuster according to claim 3, characterized in that: The elastic component (7) comprises a fixed shaft (71), a first bushing (72), a second bushing (73), a first sleeve (74), a second sleeve (75), a connecting rod (76) and a first spring (77); one end of the fixed shaft (71) is fixed on the housing (2); the length direction of the fixed shaft (71) is parallel to the length direction of the guide rail (3); the first bushing (72) and the second bushing (73) are slidably sleeved on the fixed shaft (71); the first sleeve (74) is slidably sleeved on the outer periphery of the first bushing (72); the second sleeve (75) is slidably sleeved on the outer periphery of the second bushing (73); the outer walls of the first sleeve (74) and the second sleeve (75) are connected by a connecting rod (76); the connecting rod (76) is fixedly connected to the movable rod (5); and the first spring (77) is sleeved on the outer periphery of the fixed shaft (71); The first bushing (72) is located on one end of the fixed shaft (71) connected to the housing (2), and the second bushing (73) is located on the other end of the fixed shaft (71). The fixed shaft (71) is provided with a limiting ring (732) which abuts against one end of the second bushing (73) away from the first bushing (72), and the limiting ring (732) limits the displacement of the second bushing (73) in a direction away from the first bushing (72). The end of the first bushing (72) close to the second bushing (73) is provided with a first ring platform (721), and the first ring platform (721) abuts against the end surface of the first sleeve (74) facing the second sleeve (75). The end of the second bushing (73) close to the first bushing (72) is provided with a second ring platform (731), and the second ring platform (731) abuts against the end surface of the second sleeve (75) facing the first sleeve (74); The first spring (77) is located between the first sleeve (74) and the second sleeve (75), one end of the first spring (77) is sleeved on the outer periphery of the end of the first bushing (72) close to the second bushing (73), the other end of the first spring (77) is sleeved on the outer periphery of the end of the second bushing (73) close to the first bushing (72), and two end surfaces of the first spring (77) abut against the opposite end surfaces of the first ring platform (721) and the second ring platform (731); When the slider (4) applies pressure to the first stopper (51), the second sleeve (75) drives the second bushing (73) to move toward a side away from the limiting ring (732), and the end of the first bushing (72) away from the second bushing (73) abuts against the housing (2), and the second ring stage (731) applies pressure to the first spring (77) so that the first spring (77) is compressed; when the slider (4) applies pressure to the second stopper (52), the first sleeve (74) drives the first bushing (72) to move toward a side close to the limiting ring (732), and the second bushing (73) abuts against the limiting ring (732), and the first ring stage (721) applies pressure to the first spring (77) so that the first spring (77) is compressed.

5. The arm length control device for the lever arm adjuster according to claim 4, characterized in that: The connecting rod (76) is provided with two connecting plates (761) opposite to each other. One side of the two connecting plates (761) is connected to the connecting rod (76). The two connecting plates (761) are arranged at intervals, and through grooves (762) are provided on the opposite sides of the two connecting plates (761). The through grooves (762) of the two connecting plates (761) are combined into a matching hole for the movable rod (5) to pass through. The ends of the two connecting plates (761) away from the connecting rod (76) are fixedly connected by bolts so that the two connecting plates (761) clamp the movable rod (5).

6. The arm length control device for the lever arm adjuster according to claim 3, characterized in that: The pressing block (6) comprises a first fixed block (61) and a second fixed block (62) which are fixed on the movable rod (5) and arranged opposite to each other, a receiving groove is provided on the opposite sides of the first fixed block (61) and the second fixed block (62), the receiving grooves of the first fixed block (61) and the second fixed block (62) are connected to form a cavity structure, a second spring (63) is provided in the cavity structure, a first sliding hole connected to the receiving groove is provided on the first fixed block (61), a second sliding hole connected to the receiving groove is provided on the second fixed block (62), a first pressing rod (64) is provided to slide in the first sliding hole, and a second pressing rod (64) is provided to slide in the second sliding hole. Two pressing rods (65), the first pressing rod (64) is used to press the first switch (21), and the second pressing rod (65) is used to press the second switch (22), the opposite ends of the first pressing rod (64) and the second pressing rod (65) are located in the receiving groove, and the ends of the receiving grooves of the first pressing rod (64) and the second pressing rod (65) are provided with abutment rings (66), the second spring (63) is located between the two abutment rings (66), the end surface of the second spring (63) abuts the two abutment rings (66), and the ends of the first pressing rod (64) and the second pressing rod (65) that are close to each other extend into the second spring (63).

7. The arm length control device for the lever arm adjuster according to claim 6, characterized in that: The first fixing block (61) and the second fixing block (62) are connected by bolts.

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