Mechanical folding type walking electric carrier

Abstract

The invention discloses a mechanical folding type hand-held electric carrier in the technical field of carriers, comprising: a carrier body, the bottom of which is slidably provided with wheels with adjustable wheel track and which can be folded in the height direction; a motor for providing power for the roller is mounted on the side edge of the roller; the transportation track is arranged to be in a closable ring shape; the rollers can drive the vehicle body to circularly move on the transportation track; the wheel distance of the rollers can be adjusted through the conveying rail; when the wheel distance is reduced, the vehicle body is folded; when the wheel distance of the rollers is increased, the trolley body extends; according to the invention, the cargo transportation efficiency can be greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of transport vehicles, in particular to a mechanically foldable hand-held electric transport vehicle. Background Art

[0002] Electric transport vehicles play an important role in the transportation of materials. When they are put on tracks, they can achieve fixed-track transportation tasks.

[0003] However, due to the presence of the truck bed, in order to enable multiple vehicles to work on the track at the same time, the track often needs to be designed as a circular track on a horizontal plane or a circular track on a vertical plane; the circular track on the horizontal plane occupies a large area and the laying cost and difficulty will be significantly increased, especially for long-distance transportation, such as when the track is used for fruit picking and transportation in orchards and material transportation in factories; while the circular track on the vertical plane needs to occupy a higher space, the upper track is high above the ground, and the stability of the truck during driving is poor. Summary of the invention

[0004] The object of the present invention is to provide a mechanically foldable electric hand transport vehicle to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a mechanical folding hand-held electric transport vehicle, comprising: a vehicle body, on the bottom of which rollers with adjustable wheelbase are slidably installed and can be folded in the height direction; a motor for providing power to the rollers is installed on the side of the rollers; a transport track is arranged in a closable ring shape; the rollers can drive the vehicle body to move in a circle on the transport track; the transport track can adjust the wheelbase of the rollers; when the wheelbase of the rollers is reduced, the vehicle body is folded; when the wheelbase of the rollers is increased, the vehicle body is extended.

[0006] As a further solution of the present invention, the vehicle body includes: a bottom plate for carrying cargo; four folding baffles arranged in a rectangular shape and all installed on the top of the bottom plate; a first driving member arranged at the bottom of the bottom plate and used to drive the folding baffles to fold or extend when the wheelbase changes.

[0007] As a further solution of the present invention, the folding baffle includes a baffle rod and a scissors frame; the bottom end of the scissors frame is movably connected to the bottom plate; and the top end of the scissors frame is movably connected to the baffle rod.

[0008] As a further solution of the present invention, the first driving member includes: four telescopic cylinders, one end of which is respectively fixed to the top of the four folding baffles, and the other end is fixedly connected to the bottom plate; an air box, which is fixedly installed on the bottom of the bottom plate and is connected to the four telescopic cylinders through four air pipes; a piston, which is sealed and slidably installed on the inner side of the air box; a first connecting rod, one end of which is hinged to the roller, and the other end of which is hinged to the piston.

[0009] As a further solution of the present invention, the transport track includes a first guide rail, a second guide rail and a connecting guide rail; the first guide rail is configured to be wide in the middle and narrow at both ends; the second guide rail is configured below the first guide rail, and the width of the second guide rail is equal to the width of the two sections of the first guide rail; the connecting guide rail is configured at both ends of the first guide rail and is used to smoothly connect the first guide rail and the second guide rail, so that the vehicle body can circulate between the first guide rail and the second guide rail.

[0010] As a further solution of the present invention, the rollers are arranged into two groups distributed on the left and right, and the first connecting rod is hinged to the left roller; a conducting pipe is fixedly connected to the outer wall of the air box, and the air pipe is fixedly connected to the conducting pipe, and the conducting pipe is slidably connected to a first block capable of covering the air pipe in the vertical direction; a first spring for its reset is fixedly connected to the first block; a one-way valve is fixedly installed in the first block; when the first block is located on the side of the air pipe, the air circulation direction can only be from the air box into the air pipe; a traction rope is fixedly connected to the first block, and the traction rope passes through the conducting pipe at one end away from the first block and is fixedly connected to a first slider, and the first slider is located on the inner side of the roller on the right.

[0011] As a further solution of the present invention, a second stopper is slidably installed in the air box, and the second stopper is used to control the connection between the air pipe and the air box; when the vehicle body carries cargo, the second stopper can block the air pipe connected to the telescopic cylinders on the left and right sides.

[0012] As a further solution of the present invention, a detection plate is slidably installed on the top of the base plate in the vertical direction, and a pressure spring is arranged between the detection plate and the base plate; a pressure rod is fixedly connected to the bottom of the detection plate, the bottom end of the pressure rod passes through the base plate and is hinged to a second connecting rod, and the second connecting rod is hinged to a second stopper at one end away from the pressure rod.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] Through the arrangement of the vehicle body, rollers and transport tracks, the present invention allows the vehicle body to circulate on the transport track, thereby greatly improving the transport efficiency of goods; when the rollers move along the transport track, under the action of the transport track, the rollers can automatically adjust the wheelbase, the vehicle body can automatically fold or stretch during operation, and the height occupied by the vehicle body when moving from the unloading end to the upper loading end in the folded state can be greatly reduced, which can greatly reduce the space occupied by the transport track and at the same time lower the center of gravity of the vehicle body, so that the vehicle body can move to the loading end faster and more stably, and the present invention can be applicable to long-distance transportation of goods in most cases. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 It is a schematic diagram of the vehicle body structure of the present invention;

[0017] Figure 3 This is a schematic diagram of the folding baffle structure of the present invention;

[0018] Figure 4 It is a cross-sectional schematic diagram of the vehicle body structure of the present invention (bottom view);

[0019] Figure 5 It is a schematic diagram of the transport track structure of the present invention (front view);

[0020] Figure 6 for Figure 5 A partial enlarged view of the middle part;

[0021] Figure 7 for Figure 5 A partial enlarged view of point B in the middle;

[0022] Figure 8 It is a schematic diagram of the transport track structure of the present invention (top view);

[0023] Fig. 9 It is a cross-sectional schematic diagram of the air box and its internal structure;

[0024] Fig.10 It is a cross-sectional schematic diagram of the conducting tube of the present invention and its internal structure (left side view);

[0025] Fig.11 This is a cross-sectional schematic diagram of the conductive tube and the first stopper structure of the present invention (front view)

[0026] Fig.12 It is a cross-sectional schematic diagram of the detection board and related structures of the present invention.

[0027] The reference numerals are as follows:

[0028] 1-car body, 2-roller, 3-transport track, 4-bottom plate, 5-folding baffle, 6-baffle rod, 7-scissor frame, 8-telescopic cylinder, 9-air box, 10-air pipe, 11-piston, 12-first connecting rod, 13-first guide rail, 14-second guide rail, 15-connecting guide rail, 16-conducting pipe, 17-first block, 18-check valve, 19-traction rope, 20-first slider, 21-second block, 22-detection plate, 23-pressure spring, 24-pressure rod, 25-second connecting rod. DETAILED DESCRIPTION

[0029] 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.

[0030] See also Figure 1-Figure 12 The present invention provides a technical solution: a mechanical folding hand-held electric transport vehicle, comprising a vehicle body 1 and a transport track 3; a roller 2 with an adjustable wheelbase is slidably mounted at the bottom of the vehicle body 1 and can be folded in the height direction; a motor (such as a motor) that provides power for the roller 2 is mounted on the side of the roller 2 Figure 4 As shown, a motor is installed inside the roller 2, and the power supply and control of the motor are realized by arranging a power supply device and a control system at a suitable position of the vehicle body 1. The specific settings of the power supply device and the control system can be loaded according to actual needs); the transport track 3 is arranged in a closable ring; the roller 2 can drive the vehicle body 1 to move in a circle on the transport track 3; the transport track 3 can adjust the wheelbase of the roller 2; when the wheelbase of the roller 2 is reduced, the vehicle body 1 is folded; when the wheelbase of the roller 2 is increased, the vehicle body 1 is extended.

[0031] like Figure 1When the load carrier 1 is lifted up, the load plate 2 is lifted up and the load board 3 is lowered to the loading and unloading position, so that the load carrier 1 can be easily unloaded. The height of the vehicle body 1 is greatly reduced, so the height difference between the upper layer and the lower layer of the transport track 3 can be small, the height of the upper layer of the transport track 3 and the ground can be controlled within a reasonable range, and the fully loaded vehicle body 1 can stably move to the unloading end on the upper layer of the transport track 3; the present invention can greatly improve the transportation efficiency of goods by arranging the vehicle body 1, the rollers 2 and the transport track 3; when the rollers 2 move along the transport track 3, under the action of the transport track 3, the rollers 2 can automatically adjust the wheelbase, and the vehicle body 1 can automatically fold or stretch during operation. The height occupied by the vehicle body 1 when moving from the unloading end to the upper cargo end in the folded state can be greatly reduced, which can greatly reduce the space occupied by the transport track 3 and at the same time lower the center of gravity of the vehicle body 1. The vehicle body 1 can move to the loading end faster and more stably, and the present invention can be applied to long-distance transportation of goods in most cases.

[0032] Specifically, Figure 2 As shown, the vehicle body 1 includes a bottom plate 4, a folding baffle 5 and a first driving member; the bottom plate 4 is used to carry goods; the folding baffles 5 are arranged in four rectangular shapes and are all installed on the top of the bottom plate 4; the first driving member is arranged at the bottom of the bottom plate 4 and is used to drive the folding baffles 5 to fold or extend when the wheelbase of the roller 2 changes.

[0033] When the wheelbase of the roller 2 becomes smaller, the first driving member can drive the folding baffle 5 to contract, and the height of the folding baffle 5 is reduced; when the wheelbase of the roller 2 becomes larger, the first driving member can drive the folding baffle 5 to extend, and the height of the folding baffle 5 is increased.

[0034] Specifically, Figure 2 and Figure 3 As shown, the folding baffle 5 includes a baffle rod 6 and a scissor frame 7; the bottom end of the scissor frame 7 is movably connected to the bottom plate 4; and the top end of the scissor frame 7 is movably connected to the baffle rod 6.

[0035] When the folding baffle 5 is in the extended state, the baffle rod 6 cooperates with the scissor frame 7 to protect the goods. The contraction and extension height of the scissor frame 7 is much greater than that of the telescopic baffle, and the folding baffle 5 can be contracted and extended to the maximum extent.

[0036] Specifically, Figure 2 and Figure 4 As shown, the first driving member includes four telescopic cylinders 8, an air box 9, a piston 11 and a first connecting rod 12; one end of the four telescopic cylinders 8 is respectively fixed to the top of the four folding baffles 5, and the other end is fixedly connected to the bottom plate 4; the air box 9 is fixedly installed at the bottom of the bottom plate 4 and is connected to the four telescopic cylinders 8 through four air pipes 10; the piston 11 is sealingly slidably installed on the inner side of the air box 9; one end of the first connecting rod 12 is hinged to the roller 2, and the other end is hinged to the piston 11.

[0037] When the roller 2 moves to the middle position of the vehicle body 1 under the action of the transport track 3 (the wheelbase of the roller 2 decreases), the roller 2 will drive the piston 11 to move rightward in the air box 9 through the first connecting rod 12, the space on the left side of the piston 11 in the air box 9 increases, and the air pressure decreases; since the telescopic cylinder 8 is connected to the air box 9 through the air pipe 10, and the connecting point is located on the left side of the piston 11, the telescopic cylinder 8 will contract downward under the action of the air pressure difference, and the telescopic cylinder 8 will drive the folding baffle 5 to contract downward; when the roller 2 moves from the inside to the outside under the action of the transport track 3 (the wheelbase of the roller 2 increases), the piston 11 will move leftward in the air box 9, and at this time, the piston 11 will push the air in the air box 9 into the telescopic cylinder 8 through the air pipe 10, and the telescopic cylinder 8 can drive the folding baffle 5 to extend.

[0038] Specifically, Figure 5-Figure 8 As shown, the transport track 3 includes a first guide rail 13, a second guide rail 14 and a connecting guide rail 15; the first guide rail 13 is arranged to be wide in the middle and narrow at both ends; the second guide rail 14 is arranged below the first guide rail 13, and the width of the second guide rail 14 is equal to the width of the two sections of the first guide rail 13; the connecting guide rail 15 is arranged at both ends of the first guide rail 13 and is used to smoothly connect the first guide rail 13 and the second guide rail 14, so that the vehicle body 1 can circulate between the first guide rail 13 and the second guide rail 14.

[0039] When the vehicle body 1 is loaded with goods and moves toward the unloading end (the unloading end is the right end of the first guide rail 13), the roller 2 will move on the first guide rail 13; the right end of the first guide rail 13 is set to be narrowed from wide, and when the roller 2 approaches the unloading end, the first guide rail 13 will drive the roller 2 to move toward the middle position of the vehicle body 1, and the wheelbase of the roller 2 will be reduced; Figure 7As shown, the connecting guide rail 15 at the right end of the first guide rail 13 can be in a horizontal state under the action of elastic parts such as springs when not in operation, and the unloading end is located on the left side of the connecting guide rail 15 on the right side; after the staff has unloaded the goods on the vehicle body 1, the roller 2 can continue to move to the right under the action of the motor, and when the roller 2 drives the vehicle body 1 to move to the connecting guide rail 15 on the right side, the gravity of the vehicle body 1 will drive the connecting guide rail 15 to flip downward, and then the vehicle body 1 can move from the connecting guide rail 15 on the right side to the second guide rail 14, and then the roller 2 can move along the second guide rail 14 to the upper cargo end under the drive of the motor; as shown in FIG. Figure 6 As shown, the left end of the second guide rail 14 is set to be inclined, and the roller 2 can move along the inclined surface of the left end of the second guide rail 14 to a height flush with the first guide rail 13; then the roller 2 can move to the right through the connecting guide rail 15 on the left and drive the vehicle body 1 to move to the loading position at the left end of the first guide rail 13; after the cargo is loaded, when the roller 2 moves to the right through the left end of the first guide rail 13, the first guide rail 13 will drive the wheelbase of the roller 2 to change from small to large, and the folding baffle 5 will extend to protect the cargo.

[0040] Specifically, Figure 4 , Fig. 9 and Fig.10 As shown, the rollers 2 are arranged in two groups distributed on the left and right, and the first connecting rod 12 is hinged to the left roller 2; a conducting pipe 16 is fixedly connected to the outer wall of the air box 9, and the air pipe 10 is fixedly connected to the conducting pipe 16, and the conducting pipe 16 is slidably connected to a first block 17 capable of blocking the air pipe 10 in the vertical direction; a first spring for its reset is fixedly connected to the first block 17; a one-way valve 18 is fixedly installed in the first block 17; when the first block 17 is located on the side of the air pipe 10, the air circulation direction can only be from the air box 9 to the air pipe 10; a traction rope 19 is fixedly connected to the first block 17, and the end of the traction rope 19 away from the first block 17 passes through the conducting pipe 16 and is fixedly connected to a first slider 20, and the first slider 20 is located on the inner side of the roller 2 on the right.

[0041] When the fully loaded vehicle body 1 moves toward the unloading end, the wheelbase of the roller 2 on the right side of the vehicle body 1 will first become smaller, and when the right roller 2 moves toward the middle of the vehicle body 1, it will drive the first slider 20 to move synchronously, and the first slider 20 will drive the first stopper 17 to move downward in the guide tube 16 through the traction rope 19, at which time the folding effect of the first stopper 17 on the air pipe 10 disappears; when the roller 2 on the left side passes the right end of the first guide rail 13, the air in the telescopic cylinder 8 can enter the air box 9 through the air pipe 10, and the telescopic baffle 5 will shrink; when the vehicle body 1 is located at the loading end, after loading the goods, the vehicle body 1 moves from left to right, and the wheelbase of the roller on the right side will first become larger, and at this time the first stopper 17 will move upward back to the initial position (i.e. Fig.10At this time, the first stopper 17 blocks the air pipe 10; due to the setting of the one-way valve 18, when the wheelbase of the left roller 2 increases, the air in the air box 9 can still enter the telescopic cylinder 8 through the one-way valve 18, and the telescopic cylinder 8 can be extended; when the vehicle body 1 is transported from left to right over long distances, the gas in the telescopic cylinder 8 cannot enter the air box 9, which can ensure that even if the vehicle body 1 shakes during long-distance transportation, the foldable baffle 5 can still stably maintain the extended state, and the foldable baffle 5 can stably protect the goods.

[0042] Specifically, Fig. 9 , Fig.11 as well as Fig.12 As shown, a second stopper 21 is slidably installed in the air box 9, and the second stopper 21 is used to control the connection between the air pipe 10 and the air box 9; when the vehicle body 1 carries goods, the second stopper 21 can block the air pipe 10 connected to the telescopic cylinder 8 on the left and right sides; a detection plate 22 is slidably installed on the top of the bottom plate 4 in the vertical direction, and a pressure spring 23 is arranged between the detection plate 22 and the bottom plate 4; a pressure rod 24 is fixedly connected to the bottom of the detection plate 22, and the bottom end of the pressure rod 24 passes through the bottom plate 4 and is hinged with a second connecting rod 25, and the second connecting rod 25 is hinged to the second stopper 21 at one end away from the pressure rod 24.

[0043] The detection plate 22 can cooperate with the pressure spring 23 to detect the weight of the cargo loaded on the vehicle body 1; Fig. 9 and Fig.11The state shown is the state of the vehicle body 1 being fully loaded with cargo; at this time, the second stopper 21 blocks the air pipe 10 connected to the left and right telescopic cylinders 8; in the fully loaded state, when the vehicle body 1 moves to the right to the unloading end, the wheelbase of the roller 2 becomes smaller, and the air pressure in the air box 9 decreases. At this time, only the air pipe 10 connected to the front and rear telescopic cylinders 8 is connected to the air box, and the front and rear telescopic cylinders 8 first drive the front and rear telescopic baffles 5 to retract downward, and the left and right telescopic baffles 5 are temporarily still in the extended state; the front and rear telescopic baffles 5 are retracted and folded to facilitate the unloading of the staff, and the left and right telescopic baffles 5 are in the extended state to play a protective role for the unloaded cargo, which can better protect the cargo from damage; after all the cargo is unloaded, the detection plate 22 will move upward under the action of the pressure spring 23, and the detection plate 22 will drive the second stopper 21 to move to the right through the pressure rod 24 and the second connecting rod 25 to block the air pipe 10 connected to the front and rear telescopic cylinders 8; it should be noted that When the wheelbase of the left roller 2 is reduced, the moving distance of the piston 11 in the air box 9 is a fixed value. Therefore, before the unloading is completed, the air pressure in the air box 9 is always negative pressure. After the unloading is completed, the first stopper 21 cancels the shielding of the air pipe 10 connected to the left and right telescopic cylinders 8, and the left and right telescopic cylinders 8 will quickly shrink under the action of air pressure; on the contrary, when loading goods, the first stopper 21 blocks the air pipe 10 connected to the front and rear telescopic cylinders 8, and the telescopic baffles 5 on the left and right sides are extended first, and the front and rear telescopic baffles 5 are still in a retracted state, which can facilitate the staff to load goods; in the process of loading goods, the weight of the goods will drive the detection plate 22 to move downward, and the detection plate 22 will drive the first stopper 21 to move to the left through the pressure rod 24 and the second connecting rod 25, until the first stopper 21 moves to the air pipe 10 connected to the front and rear telescopic cylinders 8, and the front and rear telescopic baffles 5 are immediately extended, which can remind the staff that the vehicle body 1 is in a fully loaded state at this time.

[0044] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A mechanical folding electric hand truck, characterized in that: include: The vehicle body (1) has a roller (2) with adjustable wheelbase slidably mounted on the bottom and can be folded in the height direction; a motor for providing power to the roller (2) is mounted on the side thereof; The transport track (3) is arranged in a closable ring shape; the roller (2) can drive the vehicle body (1) to move circularly on the transport track (3); the transport track (3) can adjust the wheelbase of the roller (2); when the wheelbase of the roller (2) decreases, the vehicle body (1) is folded; when the wheelbase of the roller (2) increases, the vehicle body (1) is extended.

2. A mechanical foldable electric hand truck according to claim 1, characterized in that: The vehicle body (1) comprises: A bottom plate (4) for carrying goods; Four folding baffles (5) are arranged in a rectangular shape and are all mounted on the top of the bottom plate (4); The first driving member is arranged at the bottom of the base plate (4) and is used for driving the folding baffle (5) to fold or extend when the wheelbase changes.

3. A mechanical foldable electric hand truck according to claim 2, characterized in that: The folding baffle (5) comprises a baffle rod (6) and a scissor frame (7); the bottom end of the scissor frame (7) is movably connected to the bottom plate (4); and the top end of the scissor frame (7) is movably connected to the baffle rod (6).

4. A mechanical foldable electric hand truck according to claim 3, characterized in that: The first driving member comprises: Four telescopic cylinders (8), one end of which is fixedly connected to the top of four folding baffles (5) respectively, and the other end of which is fixedly connected to the bottom plate (4); An air box (9) is fixedly mounted on the bottom of the base plate (4) and is connected to the four telescopic cylinders (8) through four air pipes (10); A piston (11) is sealingly and slidably mounted on the inner side of the air box (9); The first connecting rod (12) has one end hinged to the roller (2) and the other end hinged to the piston (11).

5. A mechanical foldable electric hand truck according to claim 4, characterized in that: The transport track (3) comprises a first guide rail (13), a second guide rail (14) and a connecting guide rail (15); the first guide rail (13) is arranged to be wide in the middle and narrow at both ends; the second guide rail (14) is arranged below the first guide rail (13), and the width of the second guide rail (14) is equal to the width of two sections of the first guide rail (13); the connecting guide rail (15) is arranged at both ends of the first guide rail (13) and is used to smoothly connect the first guide rail (13) and the second guide rail (14), so that the vehicle body (1) can cyclically move between the first guide rail (13) and the second guide rail (14).

6. A mechanical foldable electric hand transport vehicle according to claim 4, characterized in that: The rollers (2) are arranged in two groups distributed on the left and right, and the first connecting rod (12) is hinged to the left roller (2); a conducting pipe (16) is fixedly connected to the outer wall of the air box (9), and the air pipe (10) is fixedly connected to the conducting pipe (16); the conducting pipe (16) is slidably connected to a first block (17) capable of blocking the air pipe (10) in the vertical direction; a first spring for resetting the first block (17) is fixedly connected to the first block (17); a one-way valve (18) is fixedly installed in the first block (17); when the first block (17) is located at the side of the air pipe (10), the air flow direction can only flow from the air box (9) into the air pipe (10); a traction rope (19) is fixedly connected to the first block (17), and the end of the traction rope (19) away from the first block (17) passes through the conducting pipe (16) and is fixedly connected to a first slider (20), and the first slider (20) is located on the inner side of the roller (2) on the right side.

7. A mechanical foldable electric hand transport vehicle according to claim 6, characterized in that: A second stopper (21) is slidably mounted in the air box (9), and the second stopper (21) is used to control the air pipe (10) to be connected to the air box (9); when the vehicle body (1) carries cargo, the second stopper (21) can block the air pipe (10) connected to the telescopic cylinders (8) on the left and right sides.

8. The mechanical foldable electric hand truck according to claim 7, characterized in that: A detection plate (22) is slidably mounted on the top of the bottom plate (4) in the vertical direction, and a pressure spring (23) is arranged between the detection plate (22) and the bottom plate (4); a pressure rod (24) is fixedly connected to the bottom of the detection plate (22), and the bottom end of the pressure rod (24) passes through the bottom plate (4) and is hinged to a second connecting rod (25), and the second connecting rod (25) is hinged to a second stopper (21) at one end away from the pressure rod (24).

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