Pipe processing equipment for cooling tower

Abstract

The present invention relates to the technical field of pipe product production and processing, and relates to a pipe processing device for a cooling tower, comprising a base plate, a sleeve, a processing mechanism, and a lubricating mechanism. Sleeves are connected to both sides of the top of the base plate, and the sleeves are provided with a processing mechanism for reducing the diameter of the pipe and a lubricating mechanism for spraying lubricating oil. The processing mechanism includes a guide plate, a sliding frame, an electric push rod, and an extrusion shaft. Two sleeves are connected to the side away from each other. Four sliding frames are evenly spaced and slidably connected to the guide plate along the circumference. The sliding frame is connected to the extrusion shaft, and an electric push rod is installed in the middle of the sliding frame. When reducing the diameter of the pipe, the present invention only requires inserting the end of the pipe into the sleeve, and the pipe can be reduced in diameter by the operation of the electric push rod. There is no need for manual repeated pushing of the pipe during operation, making the entire operation more convenient. Only one device is required, and the overall reduction efficiency is also higher.

Description

Technical Field

[0001] The present invention relates to the technical field of pipe product production and processing, and particularly relates to pipe processing equipment for cooling towers. Background Art

[0002] A cooling tower is a device that uses water as a circulating coolant, absorbing heat from a system and discharging it into the atmosphere to lower the water temperature. During the installation of a cooling tower, different pipes need to be installed. When installing the pipes, the ends of the pipes need to be reduced in diameter so that different pipes can be connected.

[0003] At present, when reducing the diameter of a pipe, a plurality of reducing dies of different specifications are usually required. During the operation, the end of the pipe is continuously inserted into dies of different specifications from large to small, and the end of the pipe is reduced by the dies. The entire reducing process requires repeated operation of the pipe, which is relatively inefficient. In addition, the reduced pipe needs to be manually pulled out and inserted from the reducing die to reduce the diameter. The entire operation process is relatively cumbersome and easily causes wear to the pipe. Summary of the Invention

[0004] In view of this, the present invention provides a pipe processing device for a cooling tower.

[0005] The technical solution is: a pipe processing equipment for a cooling tower, including a base plate, a sleeve, a processing mechanism and a lubricating mechanism. Sleeves are connected to both sides of the top of the base plate. The sleeve is provided with a processing mechanism for reducing the diameter of the pipe and a lubricating mechanism for spraying lubricating oil. The processing mechanism includes a guide plate, a sliding frame, an electric push rod and an extrusion shaft. The two sleeves are connected to a guide plate on the side away from each other. Four sliding frames are slidably connected to the guide plate at even intervals along the circumference. The extrusion shaft is connected to the sliding frame. The sliding frame is slidably connected to the sleeve. An electric push rod is installed in the middle of the sliding frame, and the telescopic rod of the electric push rod is connected to the sleeve.

[0006] Furthermore, the lubrication mechanism includes an oil storage tank, a piston block, an elastic member, an extrusion assembly, a spray pipe and a connecting pipe. The oil storage tanks are rotatably connected on both sides of the sleeve. An elastic member is connected between the oil storage tank and the sleeve. The piston block is slidably connected inside the oil storage tank. A spray pipe is installed on the upper part of the sleeve. Connecting pipes are connected between the spray pipe and the two oil storage tanks. An extrusion assembly is provided between the sleeve and the oil storage tank, and the extrusion assembly is used to drive the oil storage tank to swing.

[0007] Furthermore, the extrusion assembly includes an extension plate, a guide frame, a connecting shaft and a slider. The sliders are slidably connected on both sides of the sleeve, the extension plate is slidably connected on the slider, the two sliders are connected to the connecting shaft on the sides away from each other, the bottom of the oil tank is connected to the guide frame, and the connecting shaft is located in the guide frame.

[0008] Furthermore, it also includes a supporting mechanism, which includes a swivel, an outer ring gear, a reduction motor, a connecting gear, a connecting plate, a sliding shaft and a support shaft. The two sleeves are rotatably connected to the sides away from each other, and the swivel is connected to the outer ring gear. The reduction motor is installed on both sides of the top of the base plate, and the output shaft of the reduction motor is connected to a connecting gear, which is engaged with the outer ring gear. Four connecting plates are evenly spaced and connected to the inner ring of the swivel, and four support shafts are slidably connected to the guide plate. The support shaft is connected to a sliding shaft, and an inclined groove is opened on the connecting plate, and the sliding shaft extends into the inclined groove.

[0009] Furthermore, it also includes a fixing mechanism, which includes a sliding platform, a sliding plate, a sliding block, a cylinder, a limit frame and a roller. The sliding platform is connected to the middle of the top of the base plate, the sliding plate is slidably connected to the sliding platform, and sliding blocks are slidably connected on both sides of the sliding plate. Cylinders are installed on both sides of the sliding plate, and the telescopic rods of the cylinders are connected to the sliding blocks. A limit frame is installed on the top of the sliding block, and the limit frame is rotatably connected to rollers on the upper and lower sides.

[0010] Furthermore, it also includes a reset mechanism, which includes a winding wheel, a second elastic member and a connecting rope. The lower parts of both sides of the sleeve are rotatably connected to the winding wheel, and the second elastic member is connected between the winding wheel and the sleeve. A connecting rope is wound on the winding wheel, and the end of the connecting rope is connected to the slider.

[0011] Furthermore, it also includes a guide shaft and an elastic member three. The guide shaft is connected to the slider, the extension plate is slidably connected to the guide shaft, and the elastic member three is connected between the extension plate and the guide shaft.

[0012] Furthermore, it also includes a driving mechanism, which includes a dual-axis motor, a driving gear and a transmission gear. The dual-axis motor is installed on the limit frame, and the two output shafts of the dual-axis motor are connected to the driving gear. The two ends of the roller are connected to the transmission gear, and the driving gear is engaged with the transmission gear.

[0013] Compared with the prior art, the present invention has the following advantages: 1. When the present invention performs diameter reduction processing on the pipe, it is only necessary to extend the end of the pipe into the sleeve, and the pipe can be reduced in diameter by the operation of the electric push rod. During operation, there is no need to manually push the pipe repeatedly, the entire operation process is more convenient, and only one device is required, and the efficiency of the entire diameter reduction is also higher.

[0014] 2. During the process of reducing the diameter of the pipe, the present invention can extend the support shaft into the inner wall of the pipe, and then control the support shaft to expand on the inner wall of the pipe, so that the support shaft can resist the inner wall of the pipe after the diameter is reduced, support the pipe, ensure stability during the processing, and avoid deformation of the pipe after the diameter is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0016] Figure 2 It is a structural schematic diagram of the processing mechanism of the present invention.

[0017] Figure 3 This is a schematic diagram of the first structure of the lubrication mechanism of the present invention.

[0018] Figure 4 This is a second structural schematic diagram of the lubrication mechanism of the present invention.

[0019] Figure 5 This is a third structural schematic diagram of the lubrication mechanism of the present invention.

[0020] Figure 6 It is a structural schematic diagram of the lubrication mechanism of the present invention after operation.

[0021] Figure 7 This is a schematic diagram of the first structure of the support mechanism of the present invention.

[0022] Figure 8 This is a schematic diagram of the second structure of the support mechanism of the present invention.

[0023] Figure 9 It is a structural schematic diagram of the fixing mechanism of the present invention.

[0024] Figure 10 It is a structural schematic diagram of the reset mechanism, guide shaft and elastic member of the present invention.

[0025] Figure 11 It is a structural schematic diagram of the guide shaft, elastic member 3 and slider of the present invention.

[0026] Figure 12 It is a structural schematic diagram of the slider and guide shaft of the present invention.

[0027] Figure 13 Schematic diagram of the structure of the driving mechanism of the present invention.

[0028] Explanation of the accompanying drawings: 1-base plate, 2-sleeve, 31-guide plate, 32-sliding frame, 33-electric push rod, 34-extrusion shaft, 41-oil storage tank, 42-slider, 43-extension plate, 44-guide frame, 45-connecting shaft, 46-elastic part one, 47-piston block, 48-spray pipe, 49-connecting pipe, 51-swivel, 52-outer gear ring, 53-reduction motor, 54-connecting gear, 55-connecting plate, 56-sliding shaft, 57-support shaft, 61-sliding platform, 62-sliding plate, 63-sliding block, 64-cylinder, 65-limiting frame, 66-roller, 71-winding wheel, 72-elastic part two, 73-connecting rope, 81-guide shaft, 82-elastic part three, 91-dual-axis motor, 92-driving gear, 93-transmission gear, 100-pipeline. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0030] A cooling tower pipe processing equipment, such as Figures 1-6 As shown, it includes a base plate 1, a sleeve 2, a processing mechanism and a lubricating mechanism. The left and right sides of the top of the base plate 1 are connected to the sleeve 2. The sleeve 2 is provided with a processing mechanism for reducing the diameter of the pipe 100 and a lubricating mechanism for spraying lubricating oil.

[0031] like Figure 2 As shown, the processing mechanism includes a guide plate 31, a sliding frame 32, an electric push rod 33 and an extrusion shaft 34. The two sleeves 2 are connected to a guide plate 31 on the side away from each other. Four sliding frames 32 are evenly spaced and slidingly connected to the guide plate 31 along the circumferential direction. The sliding frame 32 is connected to the extrusion shaft 34. The sliding frame 32 is slidably connected to the sleeve 2. An electric push rod 33 is installed in the middle of the sliding frame 32. The telescopic rod of the electric push rod 33 is connected to the sleeve 2 so that the outer cylinder of the electric push rod 33 will move radially along the sleeve 2 when it is in operation. When the outer cylinder moves, it will drive the sliding frame 32 to move, thereby driving the extrusion shaft 34 to move through the sliding frame 32.

[0032] like Figure 3-Figure 6As shown, the lubrication mechanism includes an oil reservoir 41, a piston block 47, an elastic member 46, an extrusion assembly, a spray pipe 48 and a connecting pipe 49. The front and rear sides of the sleeve 2 are both rotatably connected to the oil reservoir 41. An elastic member 46 is connected between the oil reservoir 41 and the sleeve 2. The elastic member 46 is a torsion spring. The piston block 47 is slidably connected to the oil reservoir 41. A spray pipe 48 is installed on the upper part of the sleeve 2. The spray pipe 48 is used to spray lubricating oil on the extrusion shaft 34. A connecting pipe 49 is connected between the spray pipe 48 and the bottom of the rear side of the two oil reservoirs 41, so that the lubricating oil in the oil reservoir 41 can flow into the spray pipe 48 through the connecting pipe 49, and then the lubricating oil is sprayed on the extrusion shaft 34 through the spray pipe 48. An extrusion assembly is provided between the sleeve 2 and the oil reservoir 41, and the extrusion assembly is used to drive the oil reservoir 41 to swing.

[0033] like Figure 3-Figure 6 As shown, the extrusion assembly includes an extension plate 43, a guide frame 44, a connecting shaft 45 and a slider 42. The front and rear sides of the sleeve 2 are slidably connected to the slider 42, and the slider 42 can slide left and right along the sleeve 2. The slider 42 is slidably connected to the extension plate 43, and the extension plate 43 can slide back and forth along the slider 42. The two sliders 42 are connected to the side away from each other with a connecting shaft 45. The bottom of the oil storage tank 41 is connected to the guide frame 44, and the connecting shaft 45 is located in the guide frame 44. When moving, the connecting shaft 45 can squeeze the guide frame 44 to move, thereby driving the oil storage tank 41 to swing.

[0034] When the pipe 100 needs to be processed, the processing equipment can be used for processing. When in use, one end of the pipe 100 can be inserted into the sleeve 2 first. The telescopic rod of the electric push rod 33 is in an extended state. During the process of the pipe 100 being extended, the pipe 100 will contact the extension plate 43 and push the extension plate 43 to move. When the extension plate 43 moves, it will drive the slider 42 to move together. When the slider 42 moves, it can drive the connecting shaft 45 to move. When the connecting shaft 45 moves, it will squeeze the guide frame 44, so that the guide frame 44 swings downward. When the guide frame 44 swings downward, it will drive the oil storage tank 41 to swing downward together. At this time, the height of the piston block 47 in the oil storage tank 41 is higher, and then the piston block 47 will slide to a lower position on the oil storage tank 41 under the action of gravity. When sliding, it will squeeze the lubricating oil in the oil storage tank 41, and inject the lubricating oil into the spray pipe 48 through the connecting pipe 49, and then spray the lubricating oil on the extrusion shaft 34 through the spray pipe 48. Then, the electric push rod 43 is controlled to The telescopic rod of the rod 33 is retracted to drive the sliding frame 32 to move toward the sleeve 2. When the sliding frame 32 moves, it can drive the extrusion shaft 34 to move. The movement of the extrusion shaft 34 can resist the outer wall of the pipe 100 and squeeze the pipe 100, thereby reducing the diameter of the position where the pipe 100 extends into the sleeve 2. At the same time, the pipe 100 can be driven to rotate by an external device to cooperate with the extrusion shaft 34 to complete the diameter reduction processing of the pipe 100. During the rotation process, the extrusion shaft 34 is provided with lubricating oil, which can reduce the friction between the extrusion shaft 34 and the pipe 100 and avoid wear of the pipe 100. In this way, the present device can be used to reduce the diameter of the pipe 100. During the diameter reduction processing, the degree of retraction of the electric telescopic rod can be controlled according to the actual required diameter reduction size to adjust the position of the extrusion shaft 34. In actual operation, the sleeves 2 on the left and right sides can be selectively used for diameter reduction processing according to the different left and right positions of the pipe 100 required to be reduced.

[0035] like Figure 7 and Figure 8As shown, it also includes a supporting mechanism, which includes a rotating ring 51, an outer ring gear 52, a reduction motor 53, a connecting gear 54, a connecting plate 55, a sliding shaft 56 and a supporting shaft 57. The two sleeves 2 are rotatably connected to the side away from each other with the rotating ring 51, and the rotating ring 51 is connected to the outer ring gear 52. The reduction motor 53 is installed on the left and right sides of the top of the base plate 1. The output shaft of the reduction motor 53 is connected to the connecting gear 54, and the connecting gear 54 is engaged with the outer ring gear 52 to make When the reduction motor 53 is in operation, it can drive the rotating ring 51 to rotate through the connecting gear 54 and the outer ring gear 52. Four connecting plates 55 are evenly spaced and connected to the inner ring of the rotating ring 51. Four support shafts 57 are slidably connected to the guide plate 31. The support shafts 57 can slide along the radial direction of the guide plate 31. The support shafts 57 are connected to the sliding shafts 56. An inclined groove is provided on the connecting plate 55, and the sliding shaft 56 extends into the inclined groove so that the connecting plate 55 can squeeze the sliding shaft 56 to move through the inclined groove when rotating.

[0036] When inserting the pipe 100, the pipe 100 can be sleeved on the outside of the support shaft 57. Then, according to the required diameter reduction, the reduction motor 53 can be controlled to drive the connecting gear 54 to rotate. When the connecting gear 54 rotates, the swivel 51 is driven to rotate through the outer ring gear 52. When the swivel 51 rotates, it can drive the connecting plate 55 to rotate. When the connecting plate 55 rotates, it drives the sliding shaft 56 to move outward through the inclined groove thereon. When the sliding shaft 56 moves, it can drive the support shaft 57 to move. The specific movement distance of the support shaft 57 can be adjusted according to the required diameter reduction of the pipe 100. After the adjustment is completed, the extrusion shaft 34 is controlled to extrude for diameter reduction. At this time, the support shaft 57 can be against the inner wall of the pipe 100 to support the pipe 100 and avoid deformation of the pipe 100 during the extrusion process.

[0037] like Figure 9As shown, it also includes a fixing mechanism, which includes a sliding platform 61, a sliding plate 62, a sliding block 63, a cylinder 64, a limit frame 65 and a roller 66. The sliding platform 61 is connected to the middle of the top of the bottom plate 1. The sliding plate 62 is slidably connected to the sliding platform 61. The sliding plate 62 can slide left and right along the sliding platform 61. The sliding blocks 63 are slidably connected to the front and rear sides of the sliding plate 62. The cylinder 64 is installed on the front and rear sides of the sliding plate 62. The telescopic rod of the cylinder 64 is connected to the sliding block 63. , so that the operation of the cylinder 64 can drive the sliding block 63 to slide, and a limit frame 65 is installed on the top of the sliding block 63, and the pipe 100 is placed between the two limit frames 65. The operation of the control cylinder 64 can drive the two sliding blocks 63 and the limit frames 65 to approach each other, so that the pipe 100 is clamped by the two limit frames 65. The upper and lower sides of the limit frames 65 are rotatably connected with rollers 66. After the limit frames 65 clamp the pipe 100, the rollers 66 contact the pipe 100, and the rotation of the pipe 100 can be assisted by the rollers 66.

[0038] When placing the pipe 100, the pipe 100 can be placed between the two limit frames 65. After placement, the telescopic rod of the cylinder 64 can be controlled to extend to drive the two limit frames 65 closer to each other, so that the limit frames 65 are against the pipe 100 and fix the pipe 100. Then, the sliding plate 62 can be driven to slide left and right to drive the pipe 100 to move left and right for diameter reduction processing. In this way, when processing the pipe 100, the limit frame 65 can be used to fix the pipe 100 to avoid the position of the pipe 100 from shifting during the processing.

[0039] like Figure 10 As shown, a reset mechanism is also included, which includes a winding wheel 71, an elastic member 72 and a connecting rope 73. The lower parts of the front and rear sides of the sleeve 2 are rotatably connected to the winding wheel 71, and an elastic member 72 is connected between the winding wheel 71 and the sleeve 2. The elastic member 72 is a torsion spring. A connecting rope 73 is wound on the winding wheel 71, and the end of the connecting rope 73 is connected to the slider 42.

[0040] When the slider 42 moves, the connecting rope 73 will be pulled out. When pulled out, the connecting rope 73 will drive the winding wheel 71 to rotate, and the elastic member 72 will be deformed. After the pipe 100 is processed, the pipe 100 is taken out. At this time, under the action of the elastic member 72, the winding wheel 71 rotates to retract the connecting rope 73. When retracted, it will pull the slider 42 to reset, thereby automatically driving the slider 42 to reset.

[0041] like Figure 10-12As shown, it also includes a guide shaft 81 and an elastic member 3 82. The guide shaft 81 is connected to the slider 42, and the extension plate 43 is slidably connected to the guide shaft 81. An elastic member 3 82 is connected between the extension plate 43 and the guide shaft 81, and the elastic member 3 82 is a reset spring.

[0042] When the support shaft 57 expands outward, it will contact the left and right extension plates 43 and push the extension plates 43 to move. The guide shaft 81 can guide the movement of the extension plates 43, and the elastic member 3 82 is compressed. After the processing of the pipe 100 is completed, the support shaft 57 is reset. At this time, under the action of the elastic member 3 82, the extension plates 43 can also be driven to reset.

[0043] like Figure 13 As shown, a driving mechanism is also included, which includes a dual-axis motor 91, a driving gear 92 and a transmission gear 93. The dual-axis motor 91 is installed on the limit frame 65, and the two output shafts of the dual-axis motor 91 are connected to the driving gear 92. The two ends of the roller 66 are connected to the transmission gear 93, and the driving gear 92 is engaged with the transmission gear 93.

[0044] After the limit frame 65 limits the position of the pipeline 100, if it is necessary to drive the pipeline 100 to rotate, the dual-axis motor 91 can be controlled to drive the driving gear 92 to rotate, and the rotation of the driving gear 92 drives the transmission gear 93 to rotate. The rotation of the transmission gear 93 drives the roller 66 to rotate, and the rotation of the roller 66 can make the pipeline 100 rotate, thereby achieving the effect of automatically driving the pipeline 100 to rotate, without the need to use external equipment to drive the pipeline 100 to rotate.

[0045] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes made to the contents described in the claims of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A cooling tower pipe processing equipment, characterized in that it includes There are a base plate (1), a sleeve (2), a processing mechanism and a lubricating mechanism, wherein both sides of the top of the base plate (1) are connected to the sleeve (2), the sleeve (2) is provided with a processing mechanism for reducing the diameter of the pipe (100) and a lubricating mechanism for spraying lubricating oil, the processing mechanism includes a guide plate (31), a sliding frame (32), an electric push rod (33) and an extrusion shaft (34), the two sleeves (2) are connected to the side away from each other with a guide plate (31), four sliding frames (32) are evenly spaced and slidably connected to the guide plate (31) along the circumferential direction, the sliding frame (32) is connected to the extrusion shaft (34), the sliding frame (32) is slidably connected to the sleeve (2), an electric push rod (33) is installed in the middle of the sliding frame (32), and the telescopic rod of the electric push rod (33) is connected to the sleeve (2); The lubricating mechanism includes an oil storage tank (41), a piston block (47), an elastic member (46), an extrusion assembly, a liquid spraying pipe (48) and a connecting pipe (49), both sides of the sleeve (2) are rotatably connected to the oil storage tank (41), an elastic member (46) is connected between the oil storage tank (41) and the sleeve (2), a piston block (47) is slidably connected inside the oil storage tank (41), a liquid spraying pipe (48) is installed on the upper part of the sleeve (2), and a connecting pipe (49) is connected between the liquid spraying pipe (48) and the two oil storage tanks (41), and an extrusion assembly is provided between the sleeve (2) and the oil storage tank (41), and the extrusion assembly is used to drive the oil storage tank (41) to swing; The extrusion assembly includes an extension plate (43), a guide frame (44), a connecting shaft (45) and a slider (42). The two sides of the sleeve (2) are slidably connected to the sliders (42). The extension plate (43) is slidably connected to the sliders (42). The two sliders (42) are connected to the connecting shaft (45) on the sides away from each other. The bottom of the oil storage tank (41) is connected to the guide frame (44), and the connecting shaft (45) is located in the guide frame (44). The support mechanism also includes a rotating ring (51), an outer gear ring (52), a reduction motor (53), a connecting gear (54), a connecting plate (55), a sliding shaft (56) and a supporting shaft (57). The two sleeves (2) are rotatably connected to the side away from each other with a rotating ring (51). The rotating ring (51) is connected to the outer gear ring (52). The reduction motor (53) is installed on both sides of the top of the bottom plate (1). The output shaft of the reduction motor (53) is connected to the connecting gear (54). The connecting gear (54) is meshed with the outer gear ring (52). The inner ring of the rotating ring (51) is evenly spaced and connected with four connecting plates (55). Four supporting shafts (57) are slidably connected to the guide plate (31). The supporting shaft (57) is connected to the sliding shaft (56). The connecting plate (55) is provided with an inclined groove, and the sliding shaft (56) extends into the inclined groove. The fixing mechanism also includes a sliding platform (61), a sliding plate (62), a sliding block (63), a cylinder (64), a limit frame (65) and a roller (66), wherein the sliding platform (61) is connected to the middle of the top of the bottom plate (1), the sliding plate (62) is slidably connected to the sliding platform (61), both sides of the sliding plate (62) are slidably connected to the sliding blocks (63), the cylinder (64) is installed on both sides of the sliding plate (62), the telescopic rod of the cylinder (64) is connected to the sliding block (63), the limit frame (65) is installed on the top of the sliding block (63), and the limit frame (65) is rotatably connected to the rollers (66) on both sides; The invention also includes a driving mechanism, which includes a dual-axis motor (91), a driving gear (92) and a transmission gear (93). The dual-axis motor (91) is installed on the limit frame (65). The two output shafts of the dual-axis motor (91) are connected to the driving gear (92). Both ends of the roller (66) are connected to the transmission gear (93). The driving gear (92) is meshed with the transmission gear (93).

2. The cooling tower pipe processing equipment according to claim 1, characterized in that: The invention also includes a reset mechanism, which includes a winding wheel (71), a second elastic member (72) and a connecting rope (73). The lower parts of both sides of the sleeve (2) are rotatably connected to the winding wheel (71), the second elastic member (72) is connected between the winding wheel (71) and the sleeve (2), and a connecting rope (73) is wound on the winding wheel (71). The end of the connecting rope (73) is connected to the slider (42).

3. The cooling tower pipe processing equipment according to claim 2, characterized in that: It also includes a guide shaft (81) and an elastic member three (82), the slider (42) is connected to the guide shaft (81), the extension plate (43) is slidably connected to the guide shaft (81), and the elastic member three (82) is connected between the extension plate (43) and the guide shaft (81).

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