Detection device for electrical equipment

Abstract

The invention discloses a detection device for electrical equipment, and relates to the technical field of electrical maintenance. Comprising an operating rod, a detection structure is installed on the operating rod and comprises a rail rod, the rail rod is installed at one end of the operating rod in a T shape, detection probes are installed at the two ends of the rail rod respectively, a traction base is slidably installed on the operating rod, and the two sides of the traction base are connected with the detection probes through connecting rods respectively; the traction seat is connected with a positioning rod which is connected with a traction rope; a control structure is mounted at one end of the operating rod and comprises a control rod, and a control block is slidably mounted in the control rod; a rope loop is installed on the control block, a positioning block is arranged in the operating rod, and the traction rope is wound around the rope loop to be connected with the positioning block. The device can be accurately controlled at a longer distance for detection, and is convenient to operate and higher in safety.

Description

Technical Field

[0001] The invention relates to the technical field of electrical maintenance, in particular to a detection device for electrical equipment. Background Art

[0002] Electrical equipment is a general term for generators, transformers, power lines, circuit breakers and other equipment in the power system. The important role that electricity plays in our lives and production cannot be ignored, and it has become an important energy source in our production and life. The most critical factor for the normal operation and transmission of electricity in a power plant is electrical equipment. Maintaining good insulation of distribution lines and electrical equipment is the most basic element to ensure personal safety and the normal operation of electrical equipment. Whether the performance of electrical insulation is good can be measured by measuring parameters such as its insulation resistance, withstand voltage, leakage current and dielectric loss.

[0003] Electrical safety distance refers to the safe and reliable distance that humans and objects can approach live parts without causing danger. For example, a certain distance should be maintained between live parts and the ground, between live parts and live parts, between live parts and humans, and between live parts and other facilities and equipment. Usually, when working near distribution lines and transformers and distribution devices, the line safety distance, transformer and distribution device safety distance, maintenance safety distance, and operation safety distance should be considered. If electrical equipment is not installed and used in accordance with safety regulations, it may cause safety accidents. Electrical safety accidents are mainly caused by electric shock and circuit failure.

[0004] Electrical equipment needs to be inspected and maintained regularly. When a fault occurs, detection equipment is also needed to determine the fault location. The detection equipment currently used is generally a handheld device or a portable device. The detection device is plugged with wires, and the probes are connected with the wires. The probes are contacted with different detection positions on the electrical equipment, and the current equipment usage is judged based on whether the readings are reasonable. Since a large number of points need to be checked and measured during the detection process, in order to improve flexibility, it is generally used to hold the detection device in one hand and control two probes to contact the detection points on the equipment with the other hand. However, when measuring with this method, the distance between the staff and the equipment is very small, and it is easy to come into contact with the equipment, which may cause safety accidents. Summary of the invention

[0005] The purpose of the present invention is to provide a detection device for electrical equipment to solve the problems raised in the above background technology. A device is proposed that can monitor the equipment at a long distance and can flexibly adjust the spacing and position of the probe to meet the needs of measuring between various spacings.

[0006] To achieve the above object, the present invention provides the following technical solutions: A detection device for electrical equipment, comprising an operating rod, a detection structure installed on the operating rod, the detection structure comprising a track rod, the track rod being T-shaped and installed at one end of the operating rod, sliders being slidably installed at both ends of the track rod, a detection probe being installed on the slider, a traction seat being slidably installed on the operating rod, and the two sides of the traction seat being connected to the sliders through connecting rods; a portion of the traction seat located inside the operating rod is connected to a positioning rod, and the positioning rod is connected to a traction rope; a control structure is installed at one end of the operating rod away from the detection structure, the control structure comprising a control rod installed on the operating rod, a control block being slidably installed inside the control rod, and handles located outside the control rod are respectively connected on both sides of the control block; a rope loop is installed on the control block, a positioning block is arranged inside the operating rod, and the traction rope passes around the rope loop and connects to the positioning block; A positioning cylinder is installed on the operating rod, a rotating seat is installed on the positioning cylinder, and the rotating seat is connected to the detector; Protective structures are respectively installed at both ends of the track rod, and the protective structures are used to protect the detection probe.

[0007] As a further solution of the present invention: the detection probe is connected to a primary wire, the detector is connected to a secondary wire, the primary wire and the secondary wire are respectively installed on an operating rod, and the primary wire is connected to the secondary wire.

[0008] As a further solution of the present invention: a baffle is fixedly installed on the operating rod and is located between the traction seat and the positioning cylinder, the positioning rod passes through the baffle, and primary sliding grooves are respectively opened on both sides of the operating rod, the traction seat passes through the primary sliding groove and is connected to a support rod, the support rod is rotatably connected to the connecting rod, and a primary spring is connected between the traction seat and the baffle.

[0009] As a further solution of the present invention: a damping rotary joint is installed on the sliding block, the damping rotary joint is connected to an extension rod, and the extension rod is connected to a detection probe.

[0010] As a further solution of the present invention: two rows of symmetrical transmission rods are rotatably mounted on the control block, bow-tie-shaped rotors are obliquely mounted on the transmission rods, torsion springs connected to the rotors are mounted on the transmission rods, and a positioning bar located between the two rows of rotors is mounted on the control block.

[0011] As a further solution of the present invention: a limit bar located outside the rotor is installed in the control rod, two sides of the control rod are provided with secondary slide grooves, the handle passes through the secondary slide grooves, and a top plate is installed at one end of the control rod away from the operating rod.

[0012] As a further solution of the present invention: a symmetrical mounting groove is opened in the control block, a transmission gear located in the mounting groove is installed on the transmission rod, a driving gear meshing with the transmission gear is installed in the mounting groove, one end of the handle is inserted into the mounting groove and is rotatably connected to the control block, and the handle is connected to the driving gear through a bevel gear.

[0013] As a further solution of the present invention: the protective structure includes a mounting plate, support plates are respectively connected to both sides of the mounting plate, a sliding bar is installed on the inner side of the support plate, both ends of the track rod are provided with grooves corresponding to the sliding bar, the sliding bar is embedded in the groove, the end of the support plate away from the mounting plate is connected to a protective plate, and a U-shaped groove is provided on the protective plate.

[0014] As a further solution of the present invention: a strip-shaped through groove is opened on the support plate, a primary rack is arranged on the inner wall of the through groove, through grooves located inside the rack are opened at both ends of the track rod, and mutually symmetrical sliding plates are slidably installed in the through grooves, and secondary springs are connected between the sliding plates. A pressure block is installed on the sliding plate, and secondary racks are respectively arranged on both sides of the pressure block, and a pressure plate is arranged on the surface of the pressure block.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The detection device for electrical equipment described above is used. The device uses an operating rod to control the detection probe to perform detection on the electrical equipment to be detected. The device can change the distance between the two detection probes at any time by adjusting the position of the handle to meet the needs of flexibly adjusting the detection distance under different circumstances. Compared with directly holding the detection probe for monitoring, the device can significantly increase the distance between the operator and the equipment to be detected. When the equipment has problems such as leakage, the possibility of safety risks caused by problems such as accidental touch or arc breakdown is reduced, which significantly improves safety. The detection device for the above-mentioned electrical equipment is adopted, and the device directly fixes the detector on the operating rod, and the angle can be adjusted according to the needs, that is, the device no longer needs to hold the detector with one hand and control the wiring with the other hand, but can be operated with both hands, while ensuring that the detector is easy to operate and view. The device is convenient for one person to complete the detection work, and is flexible and convenient to use, with high detection efficiency. In addition, the device can also perform detection within a larger spacing range. The spacing between the two detection probes is significantly larger than the spacing range that can be achieved by operating the two detection probes with one hand at the same time, and it is more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The figure is a schematic diagram of the structure of the detection device of the electrical equipment.

[0017] Figure 2 It is a schematic diagram of the bottom structure of the detection device of electrical equipment.

[0018] Figure 3 It is a schematic diagram of the cross-sectional structure of a detection device for electrical equipment.

[0019] Figure 4 It is a schematic diagram of the structure inside the control rod in the detection device of the electrical equipment.

[0020] Figure 5 It is a schematic diagram of the structure of the rotor in the detection device of the electrical equipment.

[0021] Figure 6 It is a schematic diagram of the structure inside the control block in the detection device of the electrical equipment.

[0022] Figure 7 It is a structural schematic diagram of the cross section of the track rod in the detection device of the electrical equipment.

[0023] Figure 8 It is a structural schematic diagram of the protective structure in the detection device of electrical equipment.

[0024] In the figure: 1-operating rod; 11-baffle; 12-positioning cylinder; 13-rotating seat; 14-primary slide groove; 15-positioning block; 2-detection structure; 21-primary spring; 22-track rod; 221-through groove; 222-groove; 23-traction seat; 231-support rod; 24-positioning rod; 25-connecting rod; 26-slider; 261-extension rod; 262-damping rotary joint; 27-detection probe; 271-primary wire; 28-traction rope; 3-protection structure; 31-mounting plate; 32-support plate; 321-through groove; 322-slide; 323-primary rack; 33-protective plate; 331-U-shaped groove; 34-pressure plate; 35-pressure block; 36-secondary rack; 37-sliding plate; 38-secondary spring; 4-detector; 41-secondary wire; 5-control structure; 51-control rod; 511-secondary slide groove; 512-limiting bar; 52-handle; 53-top plate; 54-control block; 541-positioning bar; 542-mounting groove; 55-rope loop; 56-rotor; 561-torsion spring; 562-transmission gear; 563-transmission rod; 57-driving gear; 58-bevel gear. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figures 1 to 8In an embodiment of the present invention, a detection device for electrical equipment includes an operating rod 1, a detection structure 2 is installed on the operating rod 1, and the detection structure 2 includes a track rod 22, the track rod 22 is T-shaped and installed at one end of the operating rod 1, sliders 26 are slidably installed at both ends of the track rod 22, and a detection probe 27 is installed on the slider 26, a traction seat 23 is slidably installed on the operating rod 1, and the two sides of the traction seat 23 are respectively connected to the slider 26 through a connecting rod 25; the part of the traction seat 23 located inside the operating rod 1 is connected to a positioning rod 24, and the positioning rod 24 is connected to a traction rope 28; a control structure 5 is installed at one end of the operating rod 1 away from the detection structure 2, and the control structure 5 includes a control rod 51 installed on the operating rod 1, a control block 54 is slidably installed inside the control rod 51, and the two sides of the control block 54 are respectively connected to a handle 52 located outside the control rod 51; a rope ring 55 is installed on the control block 54, and a positioning block 15 is arranged inside the operating rod 1, and the traction rope 28 passes around the rope ring 55 to connect the positioning block 15; The operating rod 1 is provided with a positioning cylinder 12, the positioning cylinder 12 is provided with a rotating seat 13, and the rotating seat 13 is connected to the detector 4; Protection structures 3 are respectively installed at both ends of the track rod 22 , and the protection structures 3 are used to protect the detection probe 27 .

[0027] The device is provided with a manually operable control structure 5 at one end of the operating rod 1, and an operating structure is installed at the other end for controlling the detection probe 27 to contact the electrical equipment to be detected. Two opposing sliders 26 are installed on the horizontally placed track rod 22, and each slider 26 is respectively provided with a detection end. The slider 26 is connected to the traction seat 23 located in the operating rod 1 through a connecting rod 25. The sliding of the traction seat 23 can drive the distance between the two detection probes 27 to change, so as to meet the demand for detection at different positions.

[0028] The traction seat 23 is connected by the positioning rod 24 and the traction rope 28. The other end of the traction rope 28 is fixed and passed through the rope loop 55. The user holds the operating rod 1 with one hand and moves the handle 52 with the other hand to drive the control block 54 to move, and traction is generated on the traction rod, so that the traction seat 23 slides, and then the spacing of the detection probes 27 can be changed at any time during use, realizing a flexible and convenient detection process. Since the traction rope 28 uses a structure similar to the traction of a movable pulley, the moving distance of the handle 52 can be transmitted to the slider 26 twice, so as to realize a large range of adjustment of the spacing of the detection probes 27 under the premise of a small manual operation range, improve the convenience of use, and expand the detection range.

[0029] In this device, the detector 4 is fixed on the operating rod 1. When the device is picked up, the data on the detector 4 can be conveniently viewed or operated. The detector 4 can be rotated to a certain angle as needed to facilitate the operator to view the corresponding data from the front. The protective structure 3 located at both ends of the track rod 22 is used to protect the monitoring probe when the device is not in use, to prevent the detection probe 27 from being directly exposed during transportation and storage, and to improve safety. As another embodiment of the present invention, please refer to Figure 2 and Figure 3 The detection probe 27 is connected to the primary wire 271, and the detector 4 is connected to the secondary wire 41. The primary wire 271 and the secondary wire 41 are respectively installed on the operating rod 1, and the primary wire 271 is connected to the secondary wire 41. The primary wire 271 and the secondary wire 41 are used to form a circuit connection between the detection probe 27 and the detector 4. Different sockets are generally provided on the detector 4 for various different detection functions. Different data detection can be completed by connecting the secondary wire 41 to different sockets.

[0030] See also Figures 1 to 3 The operating rod 1 is fixedly mounted with a baffle plate 11 between the traction seat 23 and the positioning cylinder 12, the positioning rod 24 passes through the baffle plate 11, and the operating rod 1 is provided with a primary slide groove 14 on both sides, the traction seat 23 passes through the primary slide groove 14 and is connected with a support rod 231, the support rod 231 is rotatably connected with the connecting rod 25, and a primary spring 21 is connected between the traction seat 23 and the baffle plate 11. The baffle plate 11 is used to cooperate with the traction seat 23, the primary slide groove 14 enables the traction seat 23 to realize the linkage of the internal and external structures of the operating rod 1, and the primary spring 21 is used to push the traction seat 23, so that after the operator releases the handle 52, the slider 26 and the handle 52 have the effect of automatically resetting.

[0031] See also Figure 3 and Figure 7 The slider 26 is provided with a damping rotary joint 262, which is connected to an extension rod 261, and the extension rod 261 is connected to the detection probe 27. The extension rod 261 enables the detection probe 27 to rotate around the slider 26 to a certain area and expand the spacing range of the detection probe 27 itself. The damping rotary joint 262 enables the extension rod 261 to be stable at any angle after being rotated, thereby meeting the adjustment requirements of the detection probe 27.

[0032] See also Figures 4 to 6Two rows of symmetrical transmission rods 563 are rotatably mounted on the control block 54, a bow-tie-shaped rotor 56 is obliquely mounted on the transmission rod 563, a torsion spring 561 connected to the rotor 56 is mounted on the transmission rod 563, and a positioning bar 541 located between the two rows of rotors 56 is mounted on the control block 54. The transmission rod 563 is used to limit the rotor 56. The outer end of the rotor 56 is approximately arc-shaped, and the center of the arc is located on one side of the transmission rod 563. Before use, the transmission rod 563 and the torsion spring 561 make the rotor 56 tend to be placed horizontally between the positioning bar 541 and the limit bar 512 in the control rod 51 and remain stable. However, due to the small distance between the two, the rotor 56 is forced to remain in an inclined state. In this state, when the handle 52 pulls the control block 54 away from the operating rod 1, the rotor 56 will not cause resistance. After the handle 52 is released, when the primary spring 21 pulls the control block 54 back, the rotor 56 will be stuck between the positioning bar 541 and the limit bar 512, preventing the control block 54 from resetting. That is, when the device is used, the staff can adjust the distance between the detection probes 27 and then perform the detection without having to keep the control of the handle 52 at all times during the detection process, which is more convenient to use.

[0033] See also Figures 4 to 6 The control rod 51 is provided with a limit bar 512 located outside the rotor 56, and the control rod 51 is provided with secondary slide grooves 511 on both sides. The handle 52 passes through the secondary slide grooves 511, and a top plate 53 is provided at one end of the control rod 51 away from the operating rod 1. The limit bar 512 is used to cooperate with the rotor 56 to limit the position of the control block 54, and the secondary slider 26 is used to limit the sliding range of the handle 52. The top plate 53 is located at the end of the control rod 51, so that the operator can press the top plate 53 and the handle 52 from both ends at the same time, and control the handle 52 to move toward the top plate 53. It should be noted that the structure of using the rotor 56 in the present device to achieve a one-way braking effect is not a restrictive structure, and similar effects can be achieved by using other ratchet or rack structures. However, although the ratchet and rack structures can lock the position at any time, they can only be locked at points separated by a small spacing, and the structure of the movable pulley in the present device will enlarge this spacing. In addition, since the positions of the connecting rod 25 and the slider 26 need to be converted using a trigonometric function relationship, the equidistant fixed-point locking cannot meet the use requirements of locking at any time in the present device. Therefore, using the rotor 56 for locking is less restricted.

[0034] See also Figures 4 to 6The control block 54 has symmetrical mounting grooves 542, the transmission rod 563 is mounted with a transmission gear 562 in the mounting groove 542, the mounting groove 542 is mounted with a driving gear 57 meshing with the transmission gear 562, one end of the handle 52 is inserted into the mounting groove 542 and is rotatably connected to the control block 54, and the handle 52 is connected to the driving gear 57 via a bevel gear 58. By rotating the handle 52 slightly, the bevel gear 58 cooperates with the meshing transmission between the driving gear 57 and the transmission gear 562, so that multiple transmission rods 563 on the same side can be rotated, and the transmission rods 563 are rotated until the rotor 56 is parallel to the position of the positioning bar 541 in the natural state, so that the rotor 56 will not be stuck between the positioning bar 541 and the limit bar 512, and the control block 54 can be automatically reset at this time to adjust the position next time.

[0035] See also Figure 1 , Figure 2 , Figure 7 and Figure 8 The protection structure 3 includes a mounting plate 31, and support plates 32 are connected to both sides of the mounting plate 31, and a slide bar 322 is installed inside the support plate 32. Both ends of the track rod 22 are provided with grooves 222 corresponding to the slide bar 322, and the slide bar 322 is embedded in the groove 222. The end of the support plate 32 away from the mounting plate 31 is connected to a protection plate 33, and a U-shaped groove 331 is provided on the protection plate 33. The mounting plate 31 is located on the back of the track rod 22, and the support plate 32 clamps the track plate from both sides. The protection plate 33 is located at the outermost side. The support plate 32 can slide on the track rod 22 to change the distance between the protection plate 33 and the track rod 22. When the mounting plate 31 is attached to the track rod 22, the protection plate 33 is at the farthest distance and is located outside the detection probe 27. The detection probe 27 is rotated to the area covered by the protection plate 33 to avoid collision with other external devices. When monitoring is performed, the protection plate 33 is moved to a position that fits the track rod 22 , and the U-shaped groove 331 on the protection plate 33 allows the slider 26 to slide normally, thus not interfering with the detection process.

[0036] See also Figure 1 , Figure 2 , Figure 7 and Figure 8The support plate 32 is provided with a strip-shaped through groove 321, and a primary rack 323 is arranged on the inner wall of the through groove 321. Both ends of the track rod 22 are provided with through grooves 221 located inside the rack. Mutually symmetrical sliding plates 37 are slidably installed in the through grooves 221. A secondary spring 38 is connected between the sliding plates 37. A pressing block 35 is installed on the sliding plate 37. Secondary racks 36 are arranged on both sides of the pressing block 35, and a pressing plate 34 is arranged on the surface of the pressing block 35. The headphone spring pushes the sliding plate 37 outward, so that the secondary rack 36 is buckled in the position engaged with the primary rack 323, limiting the sliding of the support plate 32. When the position of the support plate 32 needs to be adjusted, the pressing plate 34 is pinched from both sides and squeezed inward, so that the secondary rack 36 can move inward and disengage from the primary rack 323. The primary ruler is no longer restricted and can slide smoothly.

[0037] The working principle of the present invention is: The device uses an operating rod 1, fixes the detector 4 on the operating rod 1, and sets a horizontal track rod 22 at one end of the operating rod 1. Two detection probes 27 are relatively set on the track rod 22 and can slide relatively under control. The other end of the operating rod 1 is provided with a control structure 5, and the spacing of the detection probes 27 can be adjusted by moving the handle 52. When in use, one hand holds the operating rod 1, and the other hand adjusts the spacing of the detection probes 27, and moves the detection probes 27 to the position to be detected, so that flexible detection can be performed. Since the distance between the operator and the electrical equipment to be detected is increased, safety can be significantly improved. In addition, the adjustment process of the device is simple and convenient, with high efficiency, and can quickly complete multi-point detection work, and it is very safe and convenient to use.

[0038] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A detection device for electrical equipment, comprising an operating rod, characterized in that: The operating rod is provided with a detection structure, and the detection structure comprises a track rod, and the track rod is T-shaped and installed at one end of the operating rod, and sliders are slidably installed at both ends of the track rod, and a detection probe is installed on the slider, and a traction seat is slidably installed on the operating rod, and the two sides of the traction seat are respectively connected to the sliders through connecting rods; the part of the traction seat located inside the operating rod is connected to a positioning rod, and the positioning rod is connected to a traction rope; a control structure is installed at one end of the operating rod away from the detection structure, and the control structure comprises a control rod installed on the operating rod, and a control block is slidably installed inside the control rod, and the two sides of the control block are respectively connected to handles located outside the control rod; a rope loop is installed on the control block, and a positioning block is arranged inside the operating rod, and the traction rope passes around the rope loop to connect the positioning block; A positioning cylinder is installed on the operating rod, a rotating seat is installed on the positioning cylinder, and the rotating seat is connected to the detector; Protective structures are respectively installed at both ends of the track rod, and the protective structures are used to protect the detection probe.

2. The detection device for electrical equipment according to claim 1, characterized in that: The detection probe is connected to a primary wire, the detector is connected to a secondary wire, the primary wire and the secondary wire are respectively installed on an operating rod, and the primary wire is communicated with the secondary wire.

3. The detection device for electrical equipment according to claim 1, characterized in that: A baffle is fixedly installed on the operating rod and is located between the traction seat and the positioning cylinder. The positioning rod passes through the baffle. A primary sliding groove is opened on both sides of the operating rod. The traction seat passes through the primary sliding groove and is connected to a support rod. The support rod is rotatably connected to the connecting rod. A primary spring is connected between the traction seat and the baffle.

4. The detection device for electrical equipment according to claim 1, characterized in that: A damping rotary joint is installed on the sliding block, the damping rotary joint is connected to an extension rod, and the extension rod is connected to a detection probe.

5. The detection device for electrical equipment according to claim 1, characterized in that: Two rows of symmetrical transmission rods are rotatably mounted on the control block, a bow-tie-shaped rotor is obliquely mounted on the transmission rod, a torsion spring connected to the rotor is mounted on the transmission rod, and a positioning bar located between the two rows of rotors is mounted on the control block.

6. The detection device for electrical equipment according to claim 5, characterized in that: A limit bar located outside the rotor is installed in the control rod, two sides of the control rod are provided with secondary sliding grooves, the handle passes through the secondary sliding grooves, and a top plate is installed at one end of the control rod away from the operating rod.

7. The detection device for electrical equipment according to claim 6, characterized in that: A symmetrical mounting groove is provided in the control block, a transmission gear located in the mounting groove is installed on the transmission rod, a driving gear meshing with the transmission gear is installed in the mounting groove, one end of the handle is inserted into the mounting groove and is rotatably connected to the control block, and the handle is connected to the driving gear through a bevel gear.

8. The detection device for electrical equipment according to claim 1, characterized in that: The protective structure includes a mounting plate, support plates are connected to both sides of the mounting plate, a slide bar is installed on the inner side of the support plate, grooves corresponding to the slide bar are opened at both ends of the track rod, the slide bar is embedded in the groove, and a protective plate is connected to the end of the support plate away from the mounting plate, and a U-shaped groove is opened on the protective plate.

9. The detection device for electrical equipment according to claim 8, characterized in that: The support plate is provided with a strip-shaped through groove, and a primary rack is arranged on the inner wall of the through groove. Through grooves located inside the rack are arranged at both ends of the track rod, and mutually symmetrical sliding plates are slidably installed in the through grooves. A secondary spring is connected between the sliding plates, and a pressure block is installed on the sliding plate. Secondary racks are respectively arranged on both sides of the pressure block, and a pressure plate is arranged on the surface of the pressure block.

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