Bearing rolling element anti-fatigue test device

Abstract

The present invention relates to a fatigue resistance test device for bearing rolling elements, including a workbench. A vibration detection mechanism is provided on the top of the workbench. The vibration detection mechanism includes a vibration disc arranged on the top of the workbench. The top of the vibration disc is provided with an opening, and a number of vibration components are arranged inside the vibration disc. Above the vibration detection mechanism, there is a friction detection mechanism. The friction detection mechanism includes a detection box arranged above the vibration disc; the plurality of vibration components are distributed in a circular array. The vibration component includes a vibration plate fixed inside the vibration disc. A vibration groove is formed on the top of the vibration plate, and a vibration seat is slidably connected in the vibration groove; it solves the problems in the prior art that only friction experiments can be carried out on bearings, the types of experiments on the bearing surface are few, the bearings cannot be fully detected and experimented, it is difficult to obtain different experimental data, and the experimental effect is poor, etc.

Description

Technical Field

[0001] The present invention relates to the technical field of bearing experimental equipment, specifically a bearing rolling element anti-fatigue test device. Background Art

[0002] A Chinese patent discloses a bearing rolling element anti-fatigue test device (Publication No.: CN113865869A), which includes a fixing mechanism and an ultrasonic vibration mechanism; the fixing mechanism presses the rolling elements against the vibration head of the ultrasonic vibration mechanism; when the ultrasonic vibration mechanism vibrates, the vibration head and the rolling elements wear and consume each other; the ultrasonic vibration mechanism and the fixing mechanism are detachably fixed. The present invention can conduct tests on rolling elements, thereby providing data support for evaluating the performance of rolling elements.

[0003] In the above patent, only friction experiments can be carried out on bearings, and there are few types of experiments on the bearing surface, so bearings cannot be fully detected and experimented, it is difficult to obtain different experimental data, and the experimental effect is poor.

[0004] In order to solve the above defects, a technical solution is provided now. Summary of the Invention

[0005] The purpose of the present invention is to provide a bearing rolling element anti-fatigue test device.

[0006] The technical problems to be solved by the present invention are as follows:

[0007] In the prior art, only friction experiments can be carried out on bearings, and there are few types of experiments on the bearing surface, so bearings cannot be fully detected and experimented, it is difficult to obtain different experimental data, and the experimental effect is poor.

[0008] The purpose of the present invention can be achieved through the following technical solutions:

[0009] A bearing rolling element anti-fatigue test device includes a workbench, and a vibration detection mechanism is arranged on the top of the workbench. The vibration detection mechanism includes a vibration disk arranged on the top of the workbench. The top of the vibration disk is provided with an opening, and a number of vibration components are arranged inside the vibration disk. A friction detection mechanism is arranged above the vibration detection mechanism. The friction detection mechanism includes a detection box arranged above the vibration disk;

[0010] The several vibration components are distributed in a circular array. The vibration component includes a vibration plate fixed inside the vibration disk. A vibration groove is formed on the top of the vibration plate. A vibration seat is slidably connected in the vibration groove. A vibration shaft is rotatably connected inside the vibration disk. A first connecting rod is fixed on the outer surface of the vibration shaft. A second connecting rod is hinged between the end of the first connecting rod and the top of the vibration seat.

[0011] Further, a driving assembly is provided inside the workbench. The driving assembly includes a driving shaft rotatably connected to the bottom end inside the workbench. The top end of the driving shaft passes through the workbench and is fixed to the vibrating disk. A first driving bevel gear and a second driving bevel gear are respectively fixed on the outer surface of the driving shaft. The first driving bevel gear and the second driving bevel gear are arranged oppositely. A half gear is arranged on one side of the first driving bevel gear and the second driving bevel gear. The half gear is located between the first driving bevel gear and the second driving bevel gear. Only half of the surface of the half gear is provided with teeth. The first driving bevel gear and the second driving bevel gear are respectively meshed with the part of the half gear provided with teeth.

[0012] Further, a transmission shaft is fixed on one side of the half gear. A fixing plate is fixed to the bottom end inside the workbench. The transmission shaft passes through the fixing plate and is fixed with a first transmission bevel gear. The transmission shaft is rotatably connected to the fixing plate. A driving motor is fixed to the bottom of the workbench. The output end of the driving motor passes through the workbench and is fixed with a second transmission bevel gear. The first transmission bevel gear is meshed with the second transmission bevel gear.

[0013] Further, a first driving column is fixed to the end of the first connecting rod. A second driving column is fixed to the top of the vibrating seat. Both ends of the second connecting rod are respectively rotatably connected to the first driving column and the second driving column.

[0014] Further, a contact head is fixed to the end of the vibrating seat.

[0015] Further, a transmission wheel is fixed on the outer surface of the vibrating shaft. A transmission belt is installed between two adjacent transmission wheels. A vibrating motor is fixed to the bottom of the vibrating disk. The output end of the vibrating motor passes through the vibrating disk and is fixed to one of the vibrating shafts.

[0016] Further, an opening is provided at the bottom of the detection box. Slide plates are fixed to both outer sides of the detection box. A slide rod is slidably arranged inside the slide plate. A limiting plate is fixed to the top end of the slide rod. The bottom end of the slide rod is fixed to the top of the workbench. A lifting cylinder is fixed inside the slide plate. The output end of the lifting cylinder is fixed to the top of the workbench.

[0017] Further, a plurality of electric heating rods are fixed to the inner side wall of the detection box. A positioning plate is fixed to the inner surface of the detection box. A chute is opened at the top of the positioning plate. A slide plate is slidably connected inside the chute. A detection cylinder is fixed to the top of the slide plate. The output end of the detection cylinder passes through the slide plate and the positioning plate and is fixed with a friction plate. A pressure sensor is arranged at the end of the friction plate.

[0018] Further, a lead screw is rotatably connected to the inner surface of the chute. The lead screw passes through the sliding plate and is threadedly connected to the sliding plate. One side of the outside of the detection box is fixed with an adjustment motor, and the output end of the adjustment motor passes through the detection box and is fixed to the lead screw.

[0019] Advantages of the present invention:

[0020] Through the setting of the driving assembly of the present invention, the driving motor drives the second transmission bevel gear to rotate, thereby driving the first transmission bevel gear meshing with it to rotate. The first transmission bevel gear drives the half gear at the other end of the transmission shaft to rotate, so that the part of the half gear provided with teeth alternately meshes and drives with the first driving bevel gear and the second driving bevel gear, thereby driving the first driving bevel gear and the second driving bevel gear to alternately rotate in the reverse direction, and thereby driving the vibrating disk to periodically rotate forward and backward through the driving shaft. Thus, when the friction detection mechanism conducts a friction experiment on the roller, it can better replicate the actual movement state of the roller in the bearing, and can generate diverse frictional consumptions, making the experimental data more real.

[0021] By setting the vibration detection mechanism, the vibration motor drives one of the vibration shafts to rotate, thereby driving a plurality of vibration shafts to rotate synchronously through a plurality of transmission wheels and transmission belts. The vibration shaft can drive the rotation of the first connecting rod, and cooperate with the second connecting rod to drive the vibration seat to perform a reciprocating linear motion in the vibration groove, so that the contact head continuously strikes and vibrates the surface of the bearing to complete the vibration experiment. In addition, the plurality of contact heads provided can cooperate with the vibration motor to position and clamp the bearing, so as to facilitate the friction detection mechanism to ensure the stability of the bearing during detection. And the friction detection mechanism provided can position the bearing in the vertical direction when the vibration detection mechanism conducts vibration detection. Therefore, the vibration detection mechanism and the friction detection mechanism need to be used synchronously, which can not only realize the detection function, but also play a role in positioning and clamping the bearing, with higher practicability.

[0022] Through the setting of the friction detection mechanism, the lifting cylinder controls the telescopic movement of the output end, and cooperates with the sliding rod and the sliding plate to drive the detection box to lift, so as to wrap the vibrating disk in the detection box. By controlling the rotation of the lead screw through the adjustment motor, the sliding plate is driven to slide in the chute, and the friction plate is adjusted to the position above the bearing. At this time, the detection cylinder controls the friction plate to descend and abut against the surface of the bearing, and the load that the bearing can bear can be detected through the pressure sensor. In addition, the anti-friction performance of the rollers in the bearing can be experimented through the friction plate in cooperation with the driving assembly. The experiment has good richness. At the same time, the electric heating rod provided is used to control the temperature inside the detection box, so as to facilitate obtaining experimental data at different temperatures, making the experimental data diverse. Description of the Drawings

[0023] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0024] Figure 1 It is a schematic structural diagram of the anti-fatigue test device for the bearing rolling elements of the present invention;

[0025] Figure 2 It is a schematic structural diagram of the drive assembly of the present invention;

[0026] Figure 3 It is a top view of the structure of the vibrating bowl of the present invention;

[0027] Figure 4 It is a schematic structural diagram of the vibration assembly of the present invention;

[0028] Figure 5 It is a schematic structural diagram of the transmission wheel and the transmission belt of the present invention;

[0029] Figure 6 It is a schematic diagram of the internal structure of the detection box of the present invention.

[0030] In the figure: 1, workbench; 2, vibration detection mechanism; 3, friction detection mechanism; 101, drive assembly; 102, drive shaft; 103, first drive bevel gear; 104, second drive bevel gear; 105, half gear; 106, transmission shaft; 107, fixed plate; 108, first transmission bevel gear; 109, drive motor; 110, second transmission bevel gear; 201, vibrating bowl; 202, vibration assembly; 203, vibrating plate; 204, vibration groove; 205, vibration seat; 206, vibration shaft; 207, first connecting rod; 208, second connecting rod; 209, first drive post; 210, second drive post; 211, contact head; 212, transmission wheel; 213, transmission belt; 301, detection box; 302, sliding plate; 303, sliding rod; 304, lifting cylinder; 305, electric heating rod; 306, positioning plate; 307, sliding plate; 308, detection cylinder; 309, friction plate; 310, lead screw; 311, adjustment motor. Specific embodiments

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] Please refer to Figures 1-6 , the present invention provides a technical solution:

[0033] Bearing rolling element anti-fatigue test device, including a workbench 1, a vibration detection mechanism 2 is arranged on the top of the workbench 1. The vibration detection mechanism 2 includes a vibrating disk 201 arranged on the top of the workbench 1. A friction detection mechanism 3 is arranged above the vibration detection mechanism 2. The friction detection mechanism 3 includes a detection box 301 arranged above the vibrating disk 201. The vibration detection mechanism 2 is used to conduct a vibration experiment on the bearing surface, and the friction detection mechanism 3 is used to conduct a friction experiment on the rollers in the bearing.

[0034] A drive assembly 101 is arranged inside the workbench 1. The drive assembly 101 includes a drive shaft 102 rotatably connected to the bottom end inside the workbench 1. The top end of the drive shaft 102 passes through the workbench 1 and is fixed to the vibrating disk 201. A first drive bevel gear 103 and a second drive bevel gear 104 are respectively fixed on the outer surface of the drive shaft 102. The first drive bevel gear 103 and the second drive bevel gear 104 are arranged oppositely. A half gear 105 is arranged on one side of the first drive bevel gear 103 and the second drive bevel gear 104. The half gear 105 is located between the first drive bevel gear 103 and the second drive bevel gear 104. Only half of the surface of the half gear 105 is provided with teeth. The first drive bevel gear 103 and the second drive bevel gear 104 are respectively meshed with the part of the half gear 105 provided with teeth.

[0035] A transmission shaft 106 is fixed on one side of the half gear 105. A fixing plate 107 is fixed to the bottom end inside the workbench 1. The transmission shaft 106 passes through the fixing plate 107 and is fixed with a first transmission bevel gear 108. The transmission shaft 106 is rotatably connected to the fixing plate 107. A drive motor 109 is fixed to the bottom of the workbench 1. The output end of the drive motor 109 passes through the workbench 1 and is fixed with a second transmission bevel gear 110. The first transmission bevel gear 108 is meshed with the second transmission bevel gear 110. Through the setting of the drive assembly 101, the drive motor 109 drives the second transmission bevel gear 110 to rotate, thereby driving the meshed first transmission bevel gear 108 to rotate. The first transmission bevel gear 108 drives the half gear 105 at the other end of the transmission shaft 106 to rotate, so that the part of the half gear 105 provided with teeth alternately meshes and drives with the first drive bevel gear 103 and the second drive bevel gear 104, thereby driving the first drive bevel gear 103 and the second drive bevel gear 104 to rotate alternately in the reverse direction, and thus driving the vibrating disk 201 to rotate periodically forward and backward through the drive shaft 102. Therefore, when the friction detection mechanism 3 conducts a friction experiment on the rollers, it can better replicate the actual movement state of the rollers in the bearing, and can generate diverse friction consumptions, making the experimental data more real.

[0036] The top of the vibrating disk 201 is provided with an opening. Inside the vibrating disk 201, several vibration components 202 are arranged, and the vibration components 202 are used to conduct vibration experiments on the surface of the bearing. The several vibration components 202 are distributed in a circular array. The vibration component 202 includes a vibration plate 203 fixed inside the vibrating disk 201. A vibration groove 204 is formed at the top of the vibration plate 203. A vibration seat 205 is slidably connected in the vibration groove 204. A vibration shaft 206 is rotatably connected inside the vibrating disk 201. A first connecting rod 207 is fixed to the outer surface of the vibration shaft 206. A second connecting rod 208 is hinged between the end of the first connecting rod 207 and the top of the vibration seat 205.

[0037] A first driving column 209 is fixed to the end of the first connecting rod 207. A second driving column 210 is fixed to the top of the vibration seat 205. The two ends of the second connecting rod 208 are respectively rotatably connected to the first driving column 209 and the second driving column 210.

[0038] A contact head 211 is fixed to the end of the vibration seat 205.

[0039] A transmission wheel 212 is fixed to the outer surface of the vibration shaft 206. A transmission belt 213 is installed between two adjacent transmission wheels 212. A vibration motor is fixed to the bottom of the vibrating disk 201. The output end of the vibration motor passes through the vibrating disk 201 and is fixed to one of the vibration shafts 206. By setting the vibration detection mechanism 2, the vibration motor drives one of the vibration shafts 206 to rotate, thereby driving several vibration shafts 206 to rotate synchronously in cooperation with several transmission wheels 212 and transmission belts 213. The vibration shaft 206 can drive the rotation of the first connecting rod 207, and in cooperation with the second connecting rod 208, drive the vibration seat 205 to perform a reciprocating linear motion in the vibration groove 204, so that the contact head 211 continuously strikes and vibrates the surface of the bearing to complete the vibration experiment. In addition, the several contact heads 211 provided can cooperate with the vibration motor to position and clamp the bearing, so as to ensure the stability of the bearing when the friction detection mechanism 3 conducts detection. And the friction detection mechanism 3 provided can position the bearing in the vertical direction when the vibration detection mechanism 2 conducts vibration detection. Therefore, the vibration detection mechanism 2 and the friction detection mechanism 3 need to be used synchronously, which can not only realize the detection function, but also play a role in positioning and clamping the bearing, with higher practicability.

[0040] The bottom of the detection box 301 is provided with an opening. Sliding plates 302 are fixedly arranged on both outer sides of the detection box 301. A sliding rod 303 is slidably arranged inside the sliding plate 302. A limiting plate is fixedly arranged at the top end of the sliding rod 303. The bottom end of the sliding rod 303 is fixedly connected to the top of the workbench 1. A lifting cylinder 304 is fixedly arranged inside the sliding plate 302. The output end of the lifting cylinder 304 is fixedly connected to the top of the workbench 1. By controlling the telescopic movement of the output end of the lifting cylinder 304, the detection box 301 is driven to lift in cooperation with the sliding rod 303 and the sliding plate 302, so as to wrap the vibrating disk 201 inside the detection box 301.

[0041] A plurality of electric heating rods 305 are fixedly arranged on the inner side wall of the detection box 301. The electric heating rods 305 are used to control the temperature inside the detection box 301, so as to facilitate obtaining experimental data at different temperatures and making the experimental data diverse. A positioning plate 306 is fixedly arranged on the inner surface of the detection box 301. A chute is formed at the top of the positioning plate 306. A sliding plate 307 is slidably connected inside the chute. A detection cylinder 308 is fixedly arranged on the top of the sliding plate 307. The output end of the detection cylinder 308 passes through the sliding plate 307 and the positioning plate 306 and is fixedly connected with a friction plate 309. A pressure sensor is arranged at the end of the friction plate 309.

[0042] A lead screw 310 is rotatably connected to the inner surface of the chute. The lead screw 310 passes through the sliding plate 307 and is in threaded connection with the sliding plate 307. An adjusting motor 311 is fixedly arranged on one outer side of the detection box 301. The output end of the adjusting motor 311 passes through the detection box 301 and is fixedly connected with the lead screw 310. Through the setting of the friction detection mechanism 3, the output end of the lifting cylinder 304 is controlled to telescopic, and the detection box 301 is driven to lift in cooperation with the sliding rod 303 and the sliding plate 302, so as to wrap the vibrating disk 201 inside the detection box 301. By controlling the rotation of the lead screw 310 by the adjusting motor 311, the sliding plate 307 is driven to slide inside the chute, and the friction plate 309 is adjusted to the position above the bearing. At this time, the detection cylinder 308 controls the friction plate 309 to descend and abut against the surface of the bearing. The load that the bearing can bear can be detected through the pressure sensor. In addition, in cooperation with the driving component 101, the anti-friction performance of the rollers inside the bearing can be experimented through the friction plate 309. The experimental richness is good. At the same time, the electric heating rods 305 arranged are used to control the temperature inside the detection box 301, so as to facilitate obtaining experimental data at different temperatures and making the experimental data diverse.

[0043] Working principle:

[0044] When the present invention is in use, the bearing is placed in the vibrating bowl 201. One of the vibrating shafts 206 is driven to rotate by the vibrating motor, so as to drive a plurality of vibrating shafts 206 to rotate synchronously in cooperation with a plurality of transmission wheels 212 and transmission belts 213. The vibrating shaft 206 can drive the rotation of the first connecting rod 207, and cooperate with the second connecting rod 208 to drive the vibrating seat 205 to perform a reciprocating linear motion in the vibrating groove 204, so that the contact head 211 continuously strikes and vibrates the surface of the bearing. And the provided friction detection mechanism 3 can position the bearing in the vertical direction when the vibration detection mechanism 2 performs vibration detection;

[0045] The output end is controlled to expand and contract by the lifting cylinder 304, and the detection box 301 is driven to lift in cooperation with the slide rod 303 and the sliding plate 302, so as to wrap the vibrating bowl 201 in the detection box 301. The screw rod 310 is driven to rotate by the adjustment motor 311, so as to drive the slide plate 307 to slide in the chute, and the friction plate 309 is adjusted to the position above the bearing. At this time, the detection cylinder 308 controls the friction plate 309 to descend and abut against the surface of the bearing. The load that the bearing can bear can be detected by the pressure sensor. In addition, a plurality of contact heads 211 provided can cooperate with the vibrating motor to position and clamp the bearing, so as to ensure the stability of the bearing when the friction detection mechanism 3 performs detection;

[0046] The second transmission bevel gear 110 is driven to rotate by the driving motor 109, so as to drive the first transmission bevel gear 108 meshing with it to rotate. The first transmission bevel gear 108 drives the half gear 105 at the other end of the transmission shaft 106 to rotate, so that the part of the half gear 105 provided with teeth alternately meshes and drives with the first driving bevel gear 103 and the second driving bevel gear 104, so as to drive the first driving bevel gear 103 and the second driving bevel gear 104 to rotate in opposite directions alternately, so as to drive the vibrating bowl 201 to rotate forward and backward periodically through the driving shaft 102, and cooperate with the friction plate 309 to experiment on the anti-friction performance of the rollers in the bearing. At the same time, the provided electric heating rod 305 is used to control the temperature inside the detection box 301, so as to facilitate obtaining experimental data at different temperatures and making the experimental data diverse.

[0047] A detailed description of an embodiment of the present invention has been given above, but the content described is only a preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equal changes and improvements made according to the scope of the application of the present invention should still fall within the scope covered by the patent of the present invention.

Claims

1. Anti-fatigue test device for bearing rolling elements, comprising a workbench (1), characterized in that, A vibration detection mechanism (2) is provided on the top of the workbench (1). The vibration detection mechanism (2) includes a vibrating disc (201) provided on the top of the workbench (1). The top of the vibrating disc (201) is provided with an opening. A number of vibration components (202) are provided inside the vibrating disc (201). Above the vibration detection mechanism (2), a friction detection mechanism (3) is provided. The friction detection mechanism (3) includes a detection box (301) provided above the vibrating disc (201). A number of the vibration components (202) are distributed in a circular array. The vibration component (202) includes a vibration plate (203) fixed inside the vibrating disc (201). A vibration groove (204) is formed on the top of the vibration plate (203). A vibration seat (205) is slidably connected inside the vibration groove (204). A vibration shaft (206) is rotatably connected inside the vibrating disc (201). A first connecting rod (207) is fixed on the outer surface of the vibration shaft (206). A second connecting rod (208) is hinged between the end of the first connecting rod (207) and the top of the vibration seat (205). A contact head (211) is fixed at the end of the vibration seat (205). A transmission wheel (212) is fixed on the outer surface of the vibration shaft (206). A transmission belt (213) is installed between two adjacent transmission wheels (212). A vibration motor is fixed at the bottom of the vibrating disc (201). The output end of the vibration motor passes through the vibrating disc (201) and is fixed to one of the vibration shafts (206). The bottom of the detection box (301) is provided with an opening. Slide plates (302) are fixed on both outer sides of the detection box (301). A slide rod (303) is slidably arranged inside the slide plate (302). A limit plate is fixed at the top end of the slide rod (303). The bottom end of the slide rod (303) is fixed to the top of the workbench (1). A lifting cylinder (304) is fixed inside the slide plate (302). The output end of the lifting cylinder (304) is fixed to the top of the workbench (1).

2. The bearing rolling element anti-fatigue test device according to claim 1, characterized in that Inside the workbench (1), a driving component (101) is provided. The driving component (101) includes a driving shaft (102) rotatably connected to the bottom end inside the workbench (1). The top end of the driving shaft (102) passes through the workbench (1) and is fixed to the vibrating bowl (201). A first driving bevel gear (103) and a second driving bevel gear (104) are respectively fixed on the outer surface of the driving shaft (102). The first driving bevel gear (103) and the second driving bevel gear (104) are arranged opposite to each other. A half gear (105) is arranged on one side of the first driving bevel gear (103) and the second driving bevel gear (104). The half gear (105) is located between the first driving bevel gear (103) and the second driving bevel gear (104). Only half of the surface area of the half gear (105) is provided with teeth. The first driving bevel gear (103) and the second driving bevel gear (104) are respectively meshed with the part of the half gear (105) provided with teeth.

3. The anti-fatigue test device for bearing rolling elements according to claim 2, wherein, A transmission shaft (106) is fixed on one side of the half gear (105). A fixing plate (107) is fixed to the bottom end inside the workbench (1). The transmission shaft (106) passes through the fixing plate (107) and is fixed with a first transmission bevel gear (108). The transmission shaft (106) is rotatably connected to the fixing plate (107). A driving motor (109) is fixed to the bottom of the workbench (1). The output end of the driving motor (109) passes through the workbench (1) and is fixed with a second transmission bevel gear (110). The first transmission bevel gear (108) is meshed with the second transmission bevel gear (110).

4. The bearing rolling element anti-fatigue test device according to claim 1, characterized in that, A first driving column (209) is fixed to the end of the first connecting rod (207). A second driving column (210) is fixed to the top of the vibrating seat (205). The two ends of the second connecting rod (208) are respectively rotatably connected to the first driving column (209) and the second driving column (210).

5. The anti-fatigue test device for bearing rolling elements according to claim 1, characterized in that, A plurality of electric heating rods (305) are fixed to the inner side wall of the detection box (301). A positioning plate (306) is fixed to the inner surface of the detection box (301). A chute is formed at the top of the positioning plate (306). A sliding plate (307) is slidably connected in the chute. A detection cylinder (308) is fixed to the top of the sliding plate (307). The output end of the detection cylinder (308) passes through the sliding plate (307) and the positioning plate (306) and is fixed with a friction plate (309). A pressure sensor is arranged at the end of the friction plate (309).

6. The bearing rolling element anti-fatigue test device according to claim 5, characterized in that, A lead screw (310) is rotatably connected to the inner surface of the chute. The lead screw (310) passes through the sliding plate (307) and is threadedly connected to the sliding plate (307). An adjusting motor (311) is fixed to one side outside the detection box (301). The output end of the adjusting motor (311) passes through the detection box (301) and is fixed to the lead screw (310).

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