A device cleaning device for logistics support

Abstract

The application discloses a device cleaning device for logistics guarantee, and particularly relates to the technical field of logistics guarantee, which comprises a box body, a scrubbing mechanism arranged in the box body, a spraying mechanism arranged on the scrubbing mechanism, a lifting mechanism arranged below the box body, a reciprocating driving mechanism arranged below the box body, a vibration assembly arranged below the box body, and a connecting frame, an upper moving frame and a lower moving frame arranged above and below the connecting frame respectively, and an L-shaped rod fixedly connected to the connecting frame. The above components facilitate the cleaning of the transformer.

Description

Technical Field

[0001] This invention relates to the field of logistics support technology, specifically to a cleaning device for logistics support equipment. Background Technology

[0002] Logistics support equipment encompasses many fields. It is used to ensure the normal operation of various locations and the comfortable living conditions of personnel. Common logistics support equipment in power supply departments mainly includes generators, transformers, high-voltage ring main units, distribution cabinets, power cabinets, and control boxes.

[0003] During use, dry-type transformers typically accumulate dust and dirt both inside and outside, which affects their heat dissipation performance and reduces their service life. Therefore, it is necessary to clean the transformer. External cleaning is relatively simple and convenient, usually done by spraying the surface with a high-pressure water gun when the power is off.

[0004] In current technology, cleaning the interior of a dry-type transformer usually requires disassembling the transformer while the power is off, followed by manual brushing of the interior. The entire disassembly and assembly process is quite cumbersome. Furthermore, the transformer contains many electronic components, and the internal space is small, making cleaning difficult due to the cramped working space. After cleaning, some cleaning agent remains inside the transformer, which needs to be drained to avoid affecting its normal operation. Current technology typically uses a hair dryer to dry it, but since transformers are usually installed in high positions, the hair dryer needs to be placed accordingly, making it very inconvenient to use. Summary of the Invention

[0005] The purpose of this invention is to provide a cleaning device for logistics support equipment to solve the problem of inconvenient internal cleaning of transformers mentioned in the background art.

[0006] This invention can be achieved through the following technical solution: It includes a housing, inside which a scrubbing mechanism is provided for cleaning the inner wall of the housing and the coils; the scrubbing mechanism is equipped with a spraying mechanism; a lifting mechanism is provided below the housing, which drives the scrubbing mechanism to move and thus scrub the housing; a reciprocating drive mechanism is provided below the housing, and the lifting mechanism and the reciprocating drive mechanism are connected; a vibration component is provided below the housing, which cooperates with the reciprocating drive mechanism to cause the housing to vibrate intermittently.

[0007] A further technical improvement of the present invention is that: the scrubbing mechanism includes a connecting frame, an upper moving frame and a lower moving frame are respectively provided above and below the connecting frame, an L-shaped rod is fixedly connected to the connecting frame, the two ends of the L-shaped rod are respectively connected to the upper moving frame and the lower moving frame, a scraper is slidably connected inside the upper moving frame and the lower moving frame, a first spring is provided inside the upper moving frame and the lower moving frame, the first spring is connected to the scraper, the scraper is arranged on the four sides of the upper moving frame and the lower moving frame, and the scraper is used to scrape the inner wall of the box.

[0008] A further technical improvement of the present invention is that: the connecting frame is provided with a plurality of linearly arranged movable rings, and the inner ring of the movable rings is provided with water outlet holes.

[0009] A further technical improvement of the present invention is that: the L-shaped rod is a hollow structure and is connected to the connecting frame and the upper movable frame respectively; two liquid storage tanks are respectively provided at both ends of the top of the box; the liquid storage tanks are connected to a universal connecting pipe; and the other end of the connecting pipe is connected to the L-shaped rod.

[0010] A further technical improvement of the present invention is that: the spraying mechanism includes a lower arc-shaped cover, the lower arc-shaped cover is connected to the bottom of the upper moving frame, the upper arc-shaped cover is connected to the top of the lower moving frame, the upper moving frame is a hollow structure, and a liquid outlet hole is opened in the upper moving frame, and the liquid in the upper moving frame flows out through the liquid outlet hole to the lower arc-shaped cover.

[0011] A further technical improvement of the present invention is that: the lifting mechanism includes a motor, a transmission box is provided below the housing, the motor is mounted on the transmission box, a transmission rod is fixedly connected to the output end of the motor, both ends of the transmission rod are provided with driving bevel gears, a lead screw is rotatably connected inside the transmission box, the lead screw extends into the housing, the lead screw is threadedly connected to the lower moving frame, and a driven bevel gear is fixedly connected to one end of the lead screw located in the transmission box, the driven bevel gear meshing with the driving bevel gear.

[0012] A further technical improvement of the present invention is that: the reciprocating drive mechanism includes a cam, the transmission rod is divided into two sections, the cam is disposed at one end of the two transmission rod sections that are close to each other, a push rod is rotatably connected to the cam, a slider is rotatably connected to the free end of the push rod, a fixed cylinder is disposed at the bottom of the housing, the slider is slidably connected inside the fixed cylinder, a protrusion is disposed inside the fixed cylinder, and the protrusion is fixedly connected to the bottom of the housing.

[0013] A further technical improvement of the present invention is that: a strip groove is provided on the fixed cylinder; a limiting rod that is fixedly connected to the slider and inclined to the slider is fixedly connected to the slider; a connecting rod is slidably connected to the bottom of the box; an arc plate is provided on the connecting rod; the arc plate and the limiting rod cooperate; a discharge groove is provided at the bottom of the box; the connecting rod and the discharge groove cooperate; a second spring is provided at the bottom of the box; the second spring is connected to the connecting rod.

[0014] A further technical improvement of the present invention is that: the bottom of the box is provided with a slope, the slope is located at the center of the bottom of the box, and the position of the discharge chute is lower than the slope.

[0015] A further technical improvement of the present invention is that: the vibration assembly includes an upper base plate and a lower base plate, the upper base plate is fixedly connected to the housing, the lower base plate is located below the upper base plate, a positioning rod is fixedly connected to the upper base plate, a sliding cylinder is fixedly connected to the lower base plate, the positioning rod is slidably connected inside the sliding cylinder, a third spring is provided inside the sliding cylinder, and the third spring is connected to the positioning rod.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The combination of the wiping and lifting mechanisms allows for thorough cleaning of the interior of the enclosure. Simultaneously, the spraying mechanism works in conjunction with the wiping mechanism to apply cleaning agent to the inner walls and coils of the enclosure before wiping. The wiping mechanism then cleans the enclosure by wiping it back and forth, making this method more convenient and faster than traditional cleaning methods that require disassembling the enclosure.

[0018] 2. The lifting mechanism can also drive the reciprocating drive mechanism. The reciprocating drive mechanism, in conjunction with the vibration component, can cause the tank to vibrate, thereby shaking off the cleaning agent remaining inside the tank after cleaning to the bottom of the tank. At the same time, the reciprocating drive mechanism can also open the discharge chute at the bottom of the tank while vibrating, so as to discharge the shaken-off cleaning agent, thereby avoiding the accumulation of cleaning agent inside the transformer and causing a short circuit. The lifting mechanism can not only drive the wiping mechanism to complete the cleaning function, but also drive the transformer tank to vibrate through the reciprocating drive mechanism, thereby shaking off the liquid droplets attached to the inner wall of the transformer tank. At the same time, the reciprocating drive mechanism opens the discharge chute at the bottom of the tank, thereby discharging the cleaning agent accumulated inside the transformer tank. Attached Figure Description

[0019] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the external structure of the present invention;

[0021] Figure 2This is a schematic diagram of the internal structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the lifting mechanism of the present invention;

[0023] Figure 4 This is a schematic diagram of the wiping mechanism of the present invention;

[0024] Figure 5 This is a partial structural diagram of the present invention;

[0025] Figure 6 For the present invention Figure 5 Enlarged view of point A in the middle;

[0026] Figure 7 This is a schematic diagram of the interior of the moving circle of the present invention;

[0027] Figure 8 This is a schematic diagram of the reciprocating drive mechanism of the present invention;

[0028] Figure 9 This is a schematic diagram showing the cooperation between the reciprocating drive mechanism and the lifting mechanism of the present invention;

[0029] Figure 10 This is a schematic diagram of the vibration component of the present invention.

[0030] In the diagram: 1. Box body; 2. Scrubbing mechanism; 21. Connecting frame; 22. L-shaped rod; 23. Upper moving frame; 24. Lower moving frame; 25. Scraper; 26. First spring; 27. Moving ring; 28. Water outlet; 3. Spraying mechanism; 31. Lower arc-shaped cover; 32. Liquid outlet; 33. Upper arc-shaped cover; 4. Lifting mechanism; 41. Motor; 42. Transmission rod; 43. Driving bevel gear; 44. Driven bevel gear; 45. Lead screw; 5. Reciprocating drive mechanism; 51. Cam; 52. Push rod; 53. Slider; 54. Fixed cylinder; 55. Limiting rod; 56. Connecting rod; 57. Arc plate; 58. Second spring; 6. Transmission box; 7. Vibration assembly; 71. Slide cylinder; 72. Third spring; 73. Positioning rod; 74. Upper base plate; 75. Lower base plate; 8. Slope; 9. Liquid storage tank; 10. Connecting pipe. Detailed Implementation

[0031] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0032] Please see Figure 1-10As shown, the present invention provides a cleaning device for logistics support equipment, including a housing 1. A scrubbing mechanism 2 is provided inside the housing 1 for cleaning the inner wall and coils of the housing 1. A spraying mechanism 3 is provided on the scrubbing mechanism 2. A lifting mechanism 4 is provided below the housing 1 for driving the scrubbing mechanism 2 to move and thus scrub the housing 1. A reciprocating drive mechanism 5 is provided below the housing 1, and the lifting mechanism 4 and the reciprocating drive mechanism 5 are connected. A vibration component 7 is provided below the housing 1, and the vibration component 7 and the reciprocating drive mechanism 5 cooperate to drive the housing 1 to vibrate intermittently.

[0033] Please see Figure 4-6 As shown, the scrubbing mechanism 2 includes a connecting frame 21. An upper moving frame 23 and a lower moving frame 24 are respectively arranged above and below the connecting frame 21. An L-shaped rod 22 is fixedly connected to the connecting frame 21. The two ends of the L-shaped rod 22 are respectively connected to the upper moving frame 23 and the lower moving frame 24. Scrapers 25 are slidably connected inside the upper moving frame 23 and the lower moving frame 24. A first spring 26 is arranged inside the upper moving frame 23 and the lower moving frame 24. The first spring 26 is connected to the scraper 25. The scraper 25 is arranged on the four sides of the upper moving frame 23 and the lower moving frame 24. The scraper 25 is used to scrape the inner wall of the box 1.

[0034] Please see Figure 4-6 As shown, the connecting frame 21 is provided with a plurality of linearly arranged movable rings 27. The inner wall of the movable rings 27 is provided with brushes. By moving the movable rings 27 up and down, the brushes clean the coils inside the housing 1. The inner ring of the movable rings 27 is provided with water outlet holes 28, which are used to pass cleaning agents to clean the coils.

[0035] Please see Figure 3 As shown, the L-shaped rod 22 is a hollow structure and is connected to the connecting frame 21 and the upper moving frame 23 respectively. Two liquid storage tanks 9 are respectively provided at the top two ends of the box 1. The liquid storage tanks 9 are filled with non-conductive cleaning agents. The liquid storage tanks 9 are connected to the universal connecting pipe 10, and the other end of the connecting pipe 10 is connected to the L-shaped rod 22.

[0036] Driven by the lifting mechanism 4, the scrubbing mechanism 2 moves up and down. The scraper 25 scrapes the inner wall of the housing 1, and the moving ring 27 moves synchronously to scrape the coil. While scraping, the liquid storage tank 9 is opened, allowing the cleaning agent in it to reach the upper moving frame 23 and the connecting frame 21 through the connecting pipe 10 and the L-shaped rod 22. Then, the cleaning agent is sprayed onto the inner wall of the housing 1 and the coil through the spraying mechanism 3.

[0037] Please see Figure 4 , Figure 6As shown, the spraying mechanism 3 includes a lower arc-shaped cover 31, which is connected to the bottom of the upper moving frame 23. The upper arc-shaped cover 33 is connected to the top of the lower moving frame 24. The upper moving frame 23 is a hollow structure, and a liquid outlet hole 32 is opened inside the upper moving frame 23. The liquid inside the upper moving frame 23 flows out through the liquid outlet hole 32 to the lower arc-shaped cover 31.

[0038] When the cleaning agent in the storage tank 9 reaches the upper moving frame 23 and the connecting frame 21, it flows through the outlet 32 ​​and then, guided by the lower arc-shaped cover 31, to the inner wall of the tank 1. Afterward, the cleaning agent is collected by the upper arc-shaped cover 33 and then guided back to the inner wall of the tank 1, thus ensuring that the cleaning agent does not flow elsewhere and cause waste.

[0039] Please see Figure 9 As shown, the lifting mechanism 4 includes a motor 41. A transmission box 6 is provided below the housing 1. The motor 41 is mounted on the transmission box 6. A transmission rod 42 is fixedly connected to the output end of the motor 41. Both ends of the transmission rod 42 are provided with driving bevel gears 43. A lead screw 45 is rotatably connected inside the transmission box 6. The lead screw 45 extends into the housing 1 and is threadedly connected to the lower moving frame 24. A driven bevel gear 44 is fixedly connected to one end of the lead screw 45 located in the transmission box 6. The driven bevel gear 44 meshes with the driving bevel gear 43. The section of the lead screw 45 near the transmission box 6 is set as a telescopic structure, so as to cooperate with the vibration of the housing 1 and give the housing 1 a sufficient vibration distance. A circular hole corresponding to the lead screw 45 is opened on the L-shaped rod 22 for the lead screw 45 to pass through.

[0040] The lifting mechanism 4 is used to drive the wiping mechanism 2 to move up and down, thereby cleaning the inner wall of the box 1 and the coil. The operation process of the lifting mechanism 4 is as follows: first, the motor 41 is started, the motor 41 drives the transmission rod 42 fixed thereto to rotate, the transmission rod 42 further drives the active bevel gear 43 connected thereto to rotate, the active bevel gear 43 further drives the driven bevel gear 44 meshed thereto to rotate, the driven bevel gear 44 drives the lead screw 45 connected thereto to rotate, and the lead screw 45 thereby drives the lower moving frame 24 and the wiping mechanism 2 connected thereto to move synchronously.

[0041] Please see Figure 8 , 9 As shown, the reciprocating drive mechanism 5 includes a cam 51, and the transmission rod 42 is divided into two sections. The cam 51 is located at one end of the two transmission rods 42 that are close to each other. A push rod 52 is rotatably connected to the cam 51, and a slider 53 is rotatably connected to the free end of the push rod 52. A fixed cylinder 54 is provided at the bottom of the housing 1, and the slider 53 is slidably connected inside the fixed cylinder 54. A protrusion is provided inside the fixed cylinder 54, and the protrusion is fixedly connected to the bottom of the housing 1.

[0042] Please see Figure 8 ,9 As shown, a strip groove is provided on the fixed cylinder 54, a limiting rod 55 is fixedly connected to the slider 53 and inclined to the slider 53, a connecting rod 56 is slidably connected to the bottom of the box body 1, an arc plate 57 is provided on the connecting rod 56, the arc plate 57 and the limiting rod 55 cooperate, a discharge groove is provided at the bottom of the box body 1, the connecting rod 56 cooperates with the discharge groove, a second spring 58 is provided at the bottom of the box body 1, the second spring 58 is connected to the connecting rod 56.

[0043] Please see Figure 10 As shown, the vibration assembly 7 includes an upper base plate 74 and a lower base plate 75. The upper base plate 74 is fixedly connected to the housing 1, and the lower base plate 75 is located below the upper base plate 74. A positioning rod 73 is fixedly connected to the upper base plate 74, and a slide cylinder 71 is fixedly connected to the lower base plate 75. The positioning rod 73 is slidably connected inside the slide cylinder 71, and a third spring 72 is provided inside the slide cylinder 71. The third spring 72 is connected to the positioning rod 73.

[0044] While the lifting mechanism 4 is in operation, the transmission rod 42 drives the cam 51 on it to rotate. The cam 51 drives the push rod 52 on it to rotate, thereby pushing the slider 53 connected to it to move under the drive of the push rod 52. The movement of the slider 53 hits the protrusion. At this time, the vibration component 7, with the cooperation of the slide cylinder 71, the third spring 72 and the positioning rod 73, makes the box 1 vibrate. After cleaning, a lot of cleaning fluid will remain inside the box 1. Through the cooperation of the reciprocating drive mechanism 5 and the vibration component 7, the remaining cleaning fluid inside the box 1 can be vibrated to the bottom of the box 1, so that it can flow out from the bottom of the box 1.

[0045] While the reciprocating drive mechanism 5 is in motion, the slider 53 drives the limiting rod 55 on it to move synchronously. As the slider 53 moves, the limiting rod 55 further contacts the arc plate 57 and squeezes the arc plate 57, causing the arc plate 57 to move and eventually leave the discharge chute at the bottom of the box 1, thus opening the discharge chute. At this time, the reciprocating drive mechanism 5 just drives the box 1 to vibrate. The vibration shakes the residual cleaning agent on the inner wall of the box 1 to the bottom of the box 1. As the discharge chute opens, the cleaning agent can be discharged.

[0046] The lifting mechanism 4 not only drives the scrubbing mechanism 2 to move up and down, so that the scraper 25 on the scrubbing mechanism 2 can clean the inner wall of the transformer and the coil, but also, since the reciprocating drive mechanism 5 is connected to the lifting mechanism 4, the lifting mechanism 4 can drive the scrubbing mechanism 2 to complete the scrubbing while also driving the reciprocating drive mechanism 5 to move. As the slider 53 on the reciprocating drive mechanism 5 continuously hits the transformer housing, and the transformer is connected to the vibration component 7, which is elastically connected to the transformer, the transformer completes reciprocating vibration under the impact of the reciprocating start mechanism 5. At the same time, the reciprocating drive mechanism 5 can also open the discharge chute at the bottom of the transformer by moving the connecting rod 56, thereby discharging the vibrated detergent.

[0047] Please see Figure 2 As shown, a ramp 8 is provided at the bottom of the box 1. The ramp 8 is located at the center of the bottom of the box 1. The discharge chute is located below the ramp 8. The ramp 8 guides the cleaning agent inside the box 1 to the discharge chute and discharges it from the discharge chute.

[0048] In use, before cleaning the inside of the transformer, the transformer is first de-energized. Then, the lifting mechanism 4 is activated to drive the wiping mechanism 2 to wipe the oil and dust adhering to the inner wall of the transformer tank 1. At the same time, the spraying mechanism 3 is opened, and the storage tank 9 containing the cleaning agent is opened. The cleaning agent is sprayed onto the inner wall of the tank 1 and the coil through the spraying mechanism 3. While the wiping mechanism 2 is wiping, the reciprocating drive mechanism 5 is running at the same time. The reciprocating drive mechanism 5 intermittently taps the tank 1, so that the cleaning agent remaining on the inner wall of the tank 1 after cleaning falls to the bottom of the tank 1. At the same time, the reciprocating drive mechanism 5 can also open the discharge chute at the bottom of the tank 1 to discharge the remaining cleaning agent.

[0049] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A cleaning device for logistics support equipment, comprising a housing (1), characterized in that: The interior of the housing (1) is equipped with a scrubbing mechanism (2), which is used to clean the inner wall of the housing (1) and the coil. The scrubbing mechanism (2) is equipped with a spraying mechanism (3). A lifting mechanism (4) is provided below the box (1). The lifting mechanism (4) is used to drive the wiping mechanism (2) to move so as to wipe the box (1). A reciprocating drive mechanism (5) is provided below the box (1). The lifting mechanism (4) and the reciprocating drive mechanism (5) are connected. A vibration assembly (7) is provided below the box (1). The vibration assembly (7) and the reciprocating drive mechanism (5) work together to drive the box (1) to vibrate intermittently. The box (1) is provided with a discharge chute. The reciprocating drive mechanism (5) can control the closing of the discharge chute. The scrubbing mechanism (2) includes a connecting frame (21), with an upper moving frame (23) and a lower moving frame (24) respectively above and below the connecting frame (21). An L-shaped rod (22) is fixedly connected to the connecting frame (21), with both ends of the L-shaped rod (22) communicating with the upper moving frame (23) and the lower moving frame (24) respectively. Scrapers (25) are slidably connected inside the upper moving frame (23) and the lower moving frame (24). A first spring (26) is provided inside the upper moving frame (23) and the lower moving frame (24). The first spring (26) is connected to the scraper (25). The scraper (25) is provided on the four sides of the upper moving frame (23) and the lower moving frame (24). The scraper (25) is used to scrape the inner wall of the box (1). Multiple moving rings (27) arranged linearly are provided on the connecting frame (21). Water outlet holes (28) are opened in the inner ring of the moving rings (27). The L-shaped rod (22) is a hollow structure and is connected to the connecting frame (21) and the upper moving frame (23) respectively. Two liquid storage tanks (9) are respectively provided at the top two ends of the box (1). The liquid storage tanks (9) are connected to the universal connecting pipe (10), and the other end of the connecting pipe (10) is connected to the L-shaped rod (22). The lifting mechanism (4) includes a motor (41), a transmission box (6) is provided below the housing (1), the motor (41) is mounted on the transmission box (6), the output end of the motor (41) is fixedly connected to a transmission rod (42), both ends of the transmission rod (42) are provided with a driving bevel gear (43), the inside of the transmission box (6) is rotatably connected to a lead screw (45), the lead screw (45) extends into the housing (1), the lead screw (45) is threadedly connected to the lower moving frame (24), the end of the lead screw (45) located in the transmission box (6) is fixedly connected to a driven bevel gear (44), the driven bevel gear (44) and the driving bevel gear (43) mesh; The reciprocating drive mechanism (5) includes a cam (51), and the transmission rod (42) is divided into two sections. The cam (51) is located at one end of the two transmission rods (42) that are close to each other. A push rod (52) is rotatably connected to the cam (51). A slider (53) is rotatably connected to the free end of the push rod (52). A fixed cylinder (54) is provided at the bottom of the housing (1). The slider (53) is slidably connected inside the fixed cylinder (54). A protrusion is provided inside the fixed cylinder (54). The protrusion is fixedly connected to the bottom of the housing (1).

2. The equipment cleaning device for logistical support according to claim 1, characterized in that, The spraying mechanism (3) includes a lower arc-shaped cover (31), which is connected to the bottom of the upper moving frame (23). The upper arc-shaped cover (33) is connected to the top of the lower moving frame (24). The upper moving frame (23) is a hollow structure, and a liquid outlet hole (32) is opened inside the upper moving frame (23). The liquid inside the upper moving frame (23) flows out through the liquid outlet hole (32) to the lower arc-shaped cover (31).

3. The equipment cleaning device for logistical support according to claim 1, characterized in that, A strip groove is provided on the fixed cylinder (54). A limiting rod (55) is fixedly connected to the slider (53) and is inclined to the slider (53). A connecting rod (56) is slidably connected to the bottom of the box (1). An arc plate (57) is provided on the connecting rod (56). The arc plate (57) and the limiting rod (55) cooperate. A discharge groove is provided at the bottom of the box (1). The connecting rod (56) and the discharge groove cooperate. A second spring (58) is provided at the bottom of the box (1). The second spring (58) and the connecting rod (56) are connected.

4. The equipment cleaning device for logistical support according to claim 1, characterized in that, The bottom of the box (1) is provided with a ramp (8), which is located at the center of the bottom of the box (1), and the discharge chute is located below the ramp (8).

5. A cleaning device for logistics support equipment according to claim 1, characterized in that, The vibration assembly (7) includes an upper base plate (74) and a lower base plate (75). The upper base plate (74) is fixedly connected to the housing (1). The lower base plate (75) is located below the upper base plate (74). A positioning rod (73) is fixedly connected to the upper base plate (74). A slide cylinder (71) is fixedly connected to the lower base plate (75). The positioning rod (73) is slidably connected inside the slide cylinder (71). A third spring (72) is provided inside the slide cylinder (71). The third spring (72) is connected to the positioning rod (73).

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