Material transfer device

Abstract

The utility model provides a material transfer device, which is used for transferring small, light and fragile materials, and comprises a substrate which is vertically arranged on the edge of a bottom plate, the end surface of the substrate facing the bottom plate is a reverse surface, the other end surface of the substrate is a front surface, and the substrate is provided with a mounting hole; the baffle is fixed to the front face of the base plate, and the electric eye is used for detecting whether conveyed materials exist in front of the baffle or not; the blowing nozzle is fixed to the front face of the base plate, the blowing nozzle is connected with an air path, the blowing nozzle faces the baffle, and the blowing nozzle is used for blowing air to attach the materials to the baffle when the electric eye detects the materials; the suction cup type mechanical arm comprises a mechanical arm body and a suction cup located at the end of the mechanical arm body, the suction cup is communicated with a gas circuit device, when the electric eye detects materials, the mechanical arm body is driven to move towards the baffle, the suction cup makes contact with the materials attached to the baffle, and the gas circuit device works to make the suction cup in a negative pressure state to complete suction. The mechanical arm is away from the baffle and moves to the material to-be-released position, and the gas circuit device works to enable the suction cup to be in a positive pressure state to release materials.

Description

Technical Field

[0001] The present application relates to the field of packaging machinery, and in particular to a material transfer device used in an automatic bag feeding machine. Background Art

[0002] Automatic bag delivery machines are a type of packaging machinery widely used in the food and pharmaceutical industries. They are primarily used to cut a continuous stream of bags and drop individual bags onto a target object, such as instant noodle bags or preservative packets within food bags. Existing technologies generally include self-sliding delivery, clamping delivery, and synchronous push delivery. However, these delivery methods are not suitable for special materials, such as those that are relatively small, lightweight, or fragile. Utility Model Content

[0003] In view of this, the present application provides a material transfer device, the specific structure of which includes: a base plate, which is vertically arranged on the edge of a bottom plate, the end face of the base plate facing the bottom plate is the back face, and the other end face is the front face, and the base plate is provided with a mounting hole; a vertically arranged baffle, which is fixed on the front face of the base plate, and an electric eye, which is used to detect whether there is material being conveyed in front of the baffle; a blowing nozzle, which is fixed on the front face of the base plate, and is connected to an air circuit, and the blowing nozzle faces the baffle, and is used to blow air when the electric eye detects the material to attach the material to the baffle; a suction cup type robotic arm, which includes a robotic arm and a suction cup located at the end of the robotic arm, and the suction cup is connected to an air circuit device. When the electric eye detects the material, the robotic arm is driven to move toward the baffle so that the suction cup contacts the material attached to the baffle. The air circuit device works to put the suction cup into a negative pressure state to complete the suction of the material. The robotic arm is driven away from the baffle and moves to a position where the material is to be released. The air circuit device works to put the suction cup into a positive pressure state to release the material.

[0004] With the above-mentioned specific structure, when the material is delivered to the position by the front device, the electric eye detects the material and controls the blower nozzle to blow out gas to stick the material to the baffle. At the same time, the robotic arm rotates, and after rotating into position, the suction cup uses negative pressure to absorb the material attached to the baffle. At the same time, after the front device is cut off, the robotic arm rotates again to move the material to the release position, the suction cup enters a positive pressure state, and releases the material. For smaller, lighter or fragile materials, the material transfer device provided in this application uses air blowing positioning and a suction cup fixing method to maximize the protection of the material.

[0005] As a possible implementation method, the shaft of the end portion of the robotic arm where the suction cup is not provided is connected to a driving shaft, and the driving shaft is connected to a driving device, and the driving device is fixedly provided at the mounting hole on the back surface of the substrate; a connecting shaft is provided on the end portion of the robotic arm for connecting the suction cup, and the connecting shaft is fixed to the robotic arm through a connecting shaft seat, and the suction cup is provided on a suction cup mounting block, and the suction cup mounting block is fixed on the connecting shaft through a suction cup bracket and can rotate following the connecting shaft.

[0006] As a possible implementation method, it also includes: a rotating shaft, which is rotatably fixed on the base plate, and a detection plate is provided on the rotating shaft; a guide shaft, which is connected to the rotating shaft through a bearing mounting block, and one end of the guide shaft is fixedly connected to the connecting shaft, and the guide shaft can slide in the bearing mounting block; an induction switch, which is fixedly provided on the base plate, and the induction switch cooperates with the detection plate to control the driving device.

[0007] As a possible implementation method, the air path device is arranged on the base plate and connected to an external air source. The air path device includes: an air source inlet, connected to the air source, the air source inlet is connected to a three-way joint air path, one end of the three-way joint is connected to the blowing nozzle through a first air pipe; a vacuum generator, including an air inlet and an air outlet, the air inlet is connected to the air path of the other end of the three-way joint, the air outlet is connected to the suction cup through a second air pipe, and the second air pipe passes from the back of the substrate to the front of the substrate; and a solenoid valve is arranged on the first air pipe.

[0008] As a possible implementation, a quick-connect connector is provided on the base plate, and the quick-connect connector connects the front and back sides of the base plate. The second air pipe includes a third air pipe and a fourth air pipe. The third air pipe is connected to the quick-connect connector from the air outlet. The third air pipe includes: a digital display, which is provided on the base plate and is used to display the real-time pressure of the suction cup, and a filter, which is provided on the back side of the base plate and is used to filter the gas entering the suction cup; an air pipe connector is provided on the suction cup mounting block, and the air pipe connector is connected to the suction cup. The fourth air pipe is connected from the quick-connect connector to the air pipe connector.

[0009] As a possible implementation, a flow regulating valve is provided at the blowing nozzle, and the flow regulating valve is used to adjust the air volume of the blowing nozzle.

[0010] As a possible implementation, the electric eye is electrically connected to an amplifier, and the amplifier is fixedly arranged on the front surface of the substrate.

[0011] As a possible implementation, the driving device includes a reducer and a motor, the reducer is fixedly arranged on the reverse side of the substrate, the motor is connected to the reducer, and the driving shaft is the output shaft of the reducer.

[0012] As a possible implementation, a fixed limiting pin is provided at one end of the guide shaft away from the connecting shaft, and the fixed limiting pin is used to limit the guide shaft.

[0013] As a possible implementation, the induction switch is a slot-type switch, and the slot-type switch cooperates with the detection board; the slot-type switch is fixed on the base plate by a right-angle plate.

[0014] As a possible implementation method, a bushing bearing is provided between the connecting shaft and the connecting shaft seat, and the connecting shaft can rotate in the bushing bearing; the rotating shaft is limited on the front side of the substrate by a bearing, a bearing seat and a bearing sleeve; a circular through hole is provided on the bearing mounting block, and a linear bearing is provided in the circular through hole, and the linear bearing is limited in the circular through hole by a cover plate, and the guide shaft passes through the linear bearing, and the guide shaft can slide in the linear bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The following further illustrates the various technical features of the present application and the relationships between them with reference to the accompanying drawings. The accompanying drawings are exemplary, and some technical features are not shown in actual proportion. In addition, some drawings may omit technical features that are commonly used in the technical field to which the present application belongs and are not essential for understanding and implementing the present application, or additional technical features that are not essential for understanding and implementing the present application may be shown. In other words, the combination of the various technical features shown in the accompanying drawings is not intended to limit the present application. In addition, throughout the present application, the same figure numbers refer to the same content. The specific description of the drawings is as follows:

[0016] Figure 1 A schematic diagram of a material transfer device according to an embodiment of the present application;

[0017] Figure 2 An exploded view of a portion of components on the front side of a substrate in a material transfer device according to an embodiment of the present application;

[0018] Figure 3 An exploded view of another part of the front surface of the substrate in the material transfer device involved in the embodiment of the present application;

[0019] Figure 4 Schematic diagram of the gas path portion on the back side of the substrate in the material transfer device involved in an embodiment of the present application;

[0020] Figure 5Schematic diagram of the front gas path portion of the substrate in the material transfer device involved in an embodiment of the present application;

[0021] Figure 6 This is a schematic diagram of a waiting material suction station of a material transfer device according to an embodiment of the present application;

[0022] Figure 7 This is a schematic diagram of a material suction station of a material transfer device according to an embodiment of the present application;

[0023] Figure 8 This is a schematic diagram of a first material moving station of a material transfer device according to an embodiment of the present application;

[0024] Figure 9 This is a schematic diagram of a second material moving station of a material transfer device according to an embodiment of the present application;

[0025] Figure 10 This is a schematic diagram of a material discharge station of a material transfer device according to an embodiment of the present application;

[0026] Figure 11 This is a schematic diagram of a suction cup type robotic arm in a material transfer device at a material suction station according to an embodiment of the present application.

[0027] Explanation of reference numerals: 10 - material; 20 - substrate; 21 - mounting hole; 30 - bottom plate; 100 - baffle; 110 - baffle bracket; 120 - electric eye; 130 - amplifier; 140 - electric eye bracket; 200 - nozzle; 210 - flow control valve; 220 - nozzle mounting block; 230 - nozzle bracket; 300 - suction cup; 310 - suction cup mounting block; 311 - trachea connector; 320 - suction cup bracket; 400 - robotic arm; 410 - connecting shaft; 411 - connecting shaft seat; 412 - bushing bearing; 420 - reducer; 421 - drive shaft; 430 - motor; 500 -rotating shaft; 510-bearing seat; 520-bearing; 530-bearing sleeve; 540-detection plate; 550-slot switch; 560-right-angle plate; 600-guide shaft; 610-bearing mounting block; 620-linear bearing; 630-cover plate; 640-fixed limit pin; 1000-air path device; 1001-air source inlet; 1002-quick-plug connector; 1003-tee connector; 1004-vacuum generator; 1005-solenoid valve; 1006-digital display; 1007-filter; 1008-first air pipe; 1009-third air pipe; 1010-fourth air pipe. DETAILED DESCRIPTION

[0028] Below, the specific implementation methods of the present application are described in detail with reference to the accompanying drawings.

[0029] This application provides a material transfer device, such as Figure 1As shown, it includes a bottom plate 30 and a substrate 20 vertically arranged at the edge of the bottom plate 30. The end surface of the substrate 20 facing the bottom plate 30 is the reverse side, and the other end surface is the front side. Figure 3 As shown, a mounting hole 21 is provided on the base plate 20 , and a suction cup type robotic arm is provided through the mounting hole 21 .

[0030] Among them, Figure 2 As shown, a baffle 100 is vertically mounted on the front of the base plate 20 to support the material 10, allowing the material 10 to adhere to the baffle 100. Furthermore, an electric eye 120 is provided in conjunction with the baffle 100 to detect whether the material 10 is being conveyed in front of the baffle 100. The electric eye 120 is electrically connected to an amplifier 130, which is fixedly mounted on the front of the base plate 20. Also disposed on the front of the base plate 20 is a nozzle 200, facing the baffle 100 and connected to an air path. The nozzle 200 is used to blow air when the electric eye 120 detects the material 10, thereby attaching the material 10 to the baffle 100.

[0031] In this embodiment, if Figure 2 As shown, the baffle 100 is fixedly mounted on the front surface of the substrate 20 via a baffle bracket 110. The electric eye 120 is fixedly mounted on the baffle bracket 110 via an electric eye bracket 140. In addition, in other embodiments, the baffle 100 and the electric eye 120 can be fixedly mounted on the substrate 20 directly or by other means.

[0032] In this embodiment, if Figure 2 As shown, the mouthpiece 200 is secured to a mouthpiece bracket 230 via a mouthpiece mounting block 220. The mouthpiece bracket 230 is fixed to the front surface of the base plate 20. A flow control valve 210 is provided at the mouthpiece 200 for adjusting the air volume of the mouthpiece 200. In other embodiments, other methods may be used to adjust the air volume, such as using a solenoid valve 1005, a variable nozzle, or other devices.

[0033] In this embodiment, if Figure 2 As shown, the electric eye 120 is a fiber optic electric eye 120, which has high anti-interference performance. In addition, in other embodiments, other types of electric eyes 120 may also be used, such as infrared electric eyes 120, ultrasonic electric eyes 120, etc.

[0034] Among them, Figure 3 、 10As shown, the suction cup robot arm includes a robot arm 400 and a suction cup 300 located at the end of the robot arm 400. The suction cup 300 is connected to an air circuit device 1000. When the electric eye 120 detects the material 10, the air pump applies negative pressure to the suction cup 300, and the robot arm 400 is driven toward the baffle 100, so that the suction cup 300 absorbs the material 10 attached to the baffle 100. The robot arm 400 is then driven away from the baffle 100 and moved to the position where the material 10 is to be released. The air circuit device 1000 operates to apply positive pressure to the suction cup 300 to release the material 10.

[0035] Among them, Figure 3 、 10 As shown, the end of the robotic arm 400 where the suction cup 300 is not provided is connected to a drive shaft 421, and the drive shaft 421 is connected to a drive device, which is fixedly mounted at the mounting hole 21 on the reverse side of the substrate 20. The end of the robotic arm 400 for connecting the suction cup 300 is provided with a connecting shaft 410, and the connecting shaft 410 is fixed to the robotic arm 400 via a connecting shaft seat 411. The suction cup 300 is provided on a suction cup mounting block 310, and the suction cup mounting block 310 is fixed to the connecting shaft 410 via a suction cup bracket 320 and can rotate with the connecting shaft 410. A bushing bearing 412 is provided between the connecting shaft 410 and the connecting shaft seat 411, and the connecting shaft 410 can rotate in the bushing bearing 412. The rotating shaft 500 is limited on the front side of the substrate 20 by the bearing 520, the bearing seat 510 and the bearing sleeve 530.

[0036] In this embodiment, if Figure 3 As shown, the drive device includes a reducer 420 and a motor 430. The reducer 420 is fixedly mounted on the back surface of the base plate 20. The motor 430 is connected to the reducer 420, and the drive shaft 421 is the output shaft of the reducer 420. As the motor rotates, the reducer 420 drives the robotic arm 400 to reciprocate within the range of motion via the drive shaft 421. In other embodiments, other types of drive devices or other layout structures may be used, such as using a servo motor.

[0037] Among them, Figure 3As shown, the front or back surface of the substrate 20 also includes a rotatable shaft 500. A detection plate 540 is provided on the shaft 500. A guide shaft 600 is connected to the shaft 500 through a bearing mounting block 610, and one end of the guide shaft 600 is fixedly connected to the connecting shaft 410. The guide shaft 600 can slide in the bearing mounting block 610. A fixed limit pin 640 is provided at the end of the guide shaft 600 away from the connecting shaft 410, and the fixed limit pin 640 is used to limit the guide shaft 600. An induction switch is fixedly provided on the front or back surface of the substrate 20, and the induction switch cooperates with the detection plate 540 to control the drive device. The slot switch is fixedly provided on the front or back surface of the substrate 20 through a right angle plate 560.

[0038] In this embodiment, if Figure 3 As shown, a circular through hole is provided on the bearing mounting block 610, and a linear bearing 620 is provided in the circular through hole. The linear bearing 620 is restrained in the circular through hole by a cover plate 630. The guide shaft 600 passes through the linear bearing 620 and can slide in the linear bearing 620.

[0039] In this embodiment, the inductive switch is a slot-type switch 550. The slot-type switch 550 includes a slot in which a sensing device is disposed. The sensing device cooperates with the detection board 540 to control the driving device. In other embodiments, other types of inductive switches may also be used, for example, directly using the sensing device in conjunction with the detection board 540.

[0040] Among them, Figure 4 、 5 As shown, the material transfer device involved in this application also includes an air circuit device 1000 disposed on the base plate 30. The air circuit device 1000 includes an air source inlet 1001 connected to an external air source. The air source inlet 1001 is connected to a three-way connector 1003. One end of the three-way connector 1003 is connected to the blow nozzle 200 via a first air pipe 1008. The first air pipe 1008 is provided with a solenoid valve 1005. The other end of the three-way connector 1003 is connected to the air inlet of a vacuum generator 1004. The air outlet of the vacuum generator 1004 is connected to the suction cup 300 via a second air pipe. The second air pipe runs from the back side of the base plate 20 to the front side of the base plate 20.

[0041] In this embodiment, if Figure 4 、 5As shown, a quick-connect connector 1002 is provided on the base plate 20, which connects the front and back sides of the base plate 20. The second air pipe includes a third air pipe 1009 and a fourth air pipe 1010. The third air pipe 1009 is connected to the quick-connect connector 1002 from the air outlet. The third air pipe 1009 includes: a digital display 1006, which is provided on the bottom plate 30 and is used to display the real-time pressure of the suction cup 300; a filter 1007, which is provided on the back side of the base plate 20 and is used to filter the air entering from the negative pressure suction cup 300 to prevent dust and other particles from entering the vacuum generator 1004 and causing damage to it. The filter 1007 is externally mounted to facilitate filter replacement. A pipe connector 311 is provided on the suction cup mounting block 310, which is connected to the suction cup 300. The fourth air pipe 1010 is connected from the quick-connect connector 1002 to the pipe connector 311.

[0042] Among them, in the material transfer device involved in this application, the suction cup type robot arm includes multiple stations in the process of transferring the material 10:

[0043] (1) Waiting for the suction station: Figure 6 As shown, after the material is delivered to the desired position by the front device, motor 430 rotates the robotic arm 400 via drive shaft 421, causing the suction cup 300 to approach the baffle 100. At this position, after the electric eye 120 detects the material 10, the blow nozzle 200 begins blowing air, blowing the material 10 toward the baffle 100 and affixing it there. This position also marks the starting position of the suction cup robotic arm.

[0044] (2) Material suction station / material cutting station: Figure 7 As shown, the motor 430 drives the drive shaft 421 to rotate counterclockwise and drives the robot arm 400 to rotate, so that the suction cup 300 is close to the material 10 and absorbs the material 10. Then, the blowing nozzle 200 stops blowing and uses the cutting mechanism to cut the material 10. In addition, at this station, the detection plate 540 is coupled with the slot switch, so that the slot switch sends an electrical signal. (3) Material moving station: As shown Figure 8-9 As shown, the motor 430 drives the driving shaft 421 to rotate clockwise and drives the robot arm 400 to rotate, thereby driving the material 10 to be transported from the baffle 100 to other locations.

[0045] (4) Unloading station: Figure 10 As shown, when the material 10 is transported to the discharge position, a discharge signal is received, and the suction cup 300 enters a positive pressure state to put the material 10 down.

[0046] When the motor 430 receives a reset signal, the suction cup type robotic arm can perform two actions:

[0047] (1) When motor 430 receives a reset signal and slot switch 550 is deactivated, motor 430 drives arm 400 to rotate counterclockwise. When the suction cup arm rotates to the suction station, motor 430 receives an electrical signal from slot switch 550, causing motor 430 to drive arm 400 to rotate clockwise. Motor 430 stops after a fixed number of pulses, and this position becomes the waiting position for suction. By setting the number of pulses, a specific waiting position for suction can be preset.

[0048] (2) When the motor 430 receives the reset signal and the slot switch 550 receives an electrical signal, the motor 430 drives the robot arm 400 to rotate clockwise, as described in action (1), so that the robot arm 400 stops at the waiting position for the material suction.

[0049] In this embodiment, a control device and a control program applied to the control device are also included, which are used to send release signals, reset signals, switch signals, etc. to the driving device and / or the air circuit device, so as to realize the control of the material transfer device involved in the embodiment of this application.

[0050] In summary, the material transfer device provided herein uses the nozzle 200 to position the material 10 and the suction cup 300 and robotic arm 400 to secure and move the material 10, thereby applying relatively little force to the material 10. Therefore, when transferring relatively small, lightweight, or fragile materials 10, the material transfer device provided herein can avoid or minimize damage to the material 10.

[0051] The term "comprising" used throughout this application should not be interpreted as being restricted to what is listed thereafter; it does not exclude other structural elements or steps.

[0052] It can be understood that those skilled in the art can combine the features mentioned in one or more embodiments mentioned throughout the present application with the features of other embodiments in any appropriate manner to implement the present application.

[0053] Note that the above are only preferred embodiments of the present application and the technical principles employed. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the technical concept of the present application, all of which fall within the scope of protection of the present application.

Claims

1. A material transfer device, characterized in that: include: A base plate is vertically arranged on the edge of a bottom plate, the end surface of the base plate facing the bottom plate is the back surface, and the other end surface is the front surface, and a mounting hole is provided on the base plate; A vertically arranged baffle is fixed on the front side of the substrate. An electric eye is used to detect whether there is material being transported in front of the baffle; A blowing nozzle is fixed on the front surface of the substrate, the blowing nozzle is connected to an air path device, the blowing nozzle faces the baffle, and the blowing nozzle is used to blow air when the electric eye detects the material to adhere the material to the baffle; A suction cup type robotic arm includes a robotic arm and a suction cup located at the end of the robotic arm, the suction cup is connected to the air circuit device, when the electric eye detects the material, the robotic arm is driven to move toward the baffle so that the suction cup contacts the material attached to the baffle, the air circuit device works to put the suction cup into a negative pressure state to complete the suction of the material, the robotic arm is driven away from the baffle and moves to the position where the material is to be released, the air circuit device works to put the suction cup into a positive pressure state to release the material.

2. The material transfer device according to claim 1, characterized in that: The end of the robotic arm not provided with the suction cup is connected to a driving device via a driving shaft, and the driving device is fixedly provided at the mounting hole on the reverse side of the substrate; A connecting shaft is provided on the end of the robotic arm for connecting the suction cup, and the connecting shaft is fixed to the robotic arm through a connecting shaft seat. The suction cup is provided on a suction cup mounting block, and the suction cup mounting block is fixed on the connecting shaft through a suction cup bracket and can rotate following the connecting shaft.

3. The material transfer device according to claim 2, characterized in that: Also includes: a rotating shaft rotatably fixed on the base plate, wherein a detection plate is provided on the rotating shaft; A guide shaft is connected to the rotating shaft through a bearing mounting block, one end of the guide shaft is fixedly connected to the connecting shaft, and the guide shaft can slide in the bearing mounting block; The induction switch is fixedly arranged on the substrate, and the induction switch cooperates with the detection board to control the driving device.

4. The material transfer device according to claim 1, characterized in that: The gas path device is arranged on the bottom plate and connected to an external gas source, and the gas path device includes: An air source inlet is connected to an air source, wherein the air source inlet is connected to a three-way joint air circuit, and one end of the three-way joint is connected to the mouthpiece through a first air pipe; A vacuum generator, comprising an air inlet and an air outlet, wherein the air inlet is connected to the air path at the other end of the three-way connector, and the air outlet is connected to the suction cup via a second air pipe, wherein the second air pipe passes from the back side of the substrate to the front side of the substrate; The solenoid valve is arranged on the first air pipe.

5. The material transfer device according to claim 4, characterized in that: The substrate is provided with a quick-connect connector, the quick-connect connector connects the front and back sides of the substrate, the second air pipe includes a third air pipe and a fourth air pipe, the third air pipe is connected to the quick-connect connector from the air outlet, and the third air pipe includes: A digital display is provided on the bottom plate to display the real-time pressure of the suction cup. a filter, disposed on the reverse side of the substrate, for filtering gas entering the suction cup; The suction cup mounting block is provided with an air pipe joint, the air pipe joint is communicated with the suction cup, and the fourth air pipe is connected to the air pipe joint from the quick plug joint.

6. The material transfer device according to claim 4, characterized in that: The blowing nozzle is provided with a flow regulating valve, and the flow regulating valve is used to adjust the air volume of the blowing nozzle.

7. The material transfer device according to claim 1, characterized in that: The electric eye is electrically connected to an amplifier, and the amplifier is fixedly arranged on the front surface of the substrate.

8. The material transfer device according to claim 2, characterized in that: The driving device includes a reducer and a motor. The reducer is fixedly arranged on the reverse side of the substrate. The motor is connected to the reducer. The driving shaft is the output shaft of the reducer.

9. The material transfer device according to claim 3, characterized in that: A fixed limiting pin is provided at one end of the guide shaft away from the connecting shaft, and the fixed limiting pin is used to limit the guide shaft; The induction switch is a slot-type switch, and the slot-type switch cooperates with the detection board; The slot switch is fixed on the base plate via a right-angle plate.

10. The material transfer device according to claim 3, characterized in that: A bushing bearing is provided between the connecting shaft and the connecting shaft seat, and the connecting shaft can rotate in the bushing bearing; The rotating shaft is limited on the front surface of the base plate by a bearing, a bearing seat and a bearing sleeve; A circular through hole is provided on the bearing mounting block, a linear bearing is provided in the circular through hole, the linear bearing is limited in the circular through hole by a cover plate, the guide shaft passes through the linear bearing, and the guide shaft can slide in the linear bearing.

Images