A moisture permeable cup tightening device, tightening instrument and tightening method

Abstract

The present invention provides a moisture permeable cup tightening device, a tightening instrument and a tightening method. The moisture permeable cup comprises a receiving part and a pressing part, the pressing part is used to press the sample onto the receiving part, and the tightening device comprises: a fixing seat, a tightening part, a connecting piece and a driving mechanism; the fixing seat is provided with a first tenon matched with a first groove at the bottom and / or side of the receiving part, one side of the tightening part is connected with the connecting piece, and a second tenon matched with a second groove of the pressing piece is provided on the side of the tightening part away from the connecting piece; a torque sensing element is connected to the fixing seat, the connecting piece is connected with the driving mechanism, and the connecting piece can drive the tightening part to rotate under the cooperation of the driving mechanism, and then drive the pressing part to rotate and press onto the receiving part; the present invention can automatically clamp the sample with the torque specified by the operator, so as to avoid test errors caused by different clamping forces of the sample.

Description

Technical Field

[0001] The invention relates to the technical field of moisture permeable cups, and in particular to a moisture permeable cup tightening device, a tightening instrument and a tightening method. Background Art

[0002] The statements in this section merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] At present, when conducting a film permeation test, a cut film sample (hereinafter referred to as the sample) is usually placed in a permeable cup first, and then the permeable cup cover is directly tightened by hand or the screws on the cup cover are tightened with a screwdriver, so that the cup cover and the cup body press the sample tightly, so as to achieve the purpose of sealing the contents of the permeable cup with the film.

[0004] The inventors found that due to the wide variety of samples and their different physical properties, the requirements for the clamping force are also different. For example, if the clamping force is too large, the sample will be over-tightened; if the clamping force is too small, the sample cannot be clamped. The difference in the clamping force during each test will directly lead to unstable penetration test data, or even directly produce wrong test data. In addition, when changing the sample, it is necessary to manually open the moisture permeable cup cover and tighten it after changing the sample. When conducting multiple cup tests, this work becomes complicated and consumes a lot of manpower. Summary of the invention

[0005] In order to solve the deficiencies of the prior art, the present invention provides a moisture permeable cup tightening device, a tightening instrument and a tightening method, which can automatically clamp the sample with the torque specified by the operator to avoid test errors caused by different sample clamping forces.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A first aspect of the present invention provides a moisture permeable cup tightening device.

[0008] A moisture permeable cup tightening device, the moisture permeable cup comprises a receiving piece and a pressing piece, the pressing piece is used to press the sample onto the receiving piece, the tightening device comprises: a fixing seat, a tightening piece, a connecting piece and a driving mechanism;

[0009] The fixing seat is provided with a first tenon matched with a first groove at the bottom and / or side of the accommodating member, one side of the tightening member is connected to the connecting member, and a second tenon matched with a second groove of the pressing member is provided on a side of the tightening member away from the connecting member;

[0010] The fixing seat is connected with a torque sensing element, and the connecting piece is connected with the driving mechanism. The connecting piece can drive the tightening piece to rotate under the cooperation of the driving mechanism, and then drive the pressing piece to rotate and press onto the receiving piece.

[0011] Furthermore, the connecting member is a spline shaft, one end of the spline shaft is connected to one side of the tightening member, and the other end of the spline shaft is connected to the handle.

[0012] Furthermore, the driving mechanism includes: a flat key, an electromagnetic clutch, a spline sleeve, a driving gear, a driven gear and a motor, the spline sleeve is sleeved and key-connected to the outside of the spline shaft, the electromagnetic clutch is sleeved to the outside of the spline sleeve and connected to the spline sleeve through a flat key;

[0013] The driven gear sleeve is arranged on the outside of the spline sleeve, the driven gear is meshed with the driving gear, and the driving gear can rotate under the drive of the motor. The electromagnetic clutch includes an electromagnet and a clutch body. The driven gear is connected with a friction plate, and the friction plate is opposite to the clutch body.

[0014] The fixing seat is provided with a space for placing the accommodating member, and a first tenon is provided in the space and / or on the upper edge of the fixing seat.

[0015] Furthermore, it also includes a frame, a fixing seat, an electromagnet and a motor are all fixed on the frame, and a torque sensor element is arranged at the connection position between the fixing seat and the frame.

[0016] Furthermore, the first tenon and / or the second tenon are made of non-metallic material.

[0017] Furthermore, the driving mechanism is a handle, one end of the connecting member is connected to one side of the tightening member, and the other end of the connecting member is connected to the handle.

[0018] The second aspect of the present invention provides a method for tightening a moisture permeable cup, using the above-mentioned moisture permeable cup tightening device, comprising the following steps:

[0019] When the electromagnet is not energized, the handle is operated to move the tightening member downward and fall onto the pressing member, and the handle is turned to lock the second tenon into the second groove of the pressing member;

[0020] When the electromagnet is energized, the clutch body attracts the friction plate, and transmits the rotation of the motor to the tightening member through the driving gear and the driven gear, thereby driving the pressing member to rotate, and realizing the tightening of the pressing member and the receiving member;

[0021] When the motor rotates in the reverse direction and the electromagnet is energized, the clutch body attracts the friction plate and transmits the rotation of the motor to the tightening member through the driving gear and the driven gear, driving the pressing member to rotate and realizing the opening of the pressing member and the receiving member.

[0022] A third aspect of the present invention provides a moisture permeable cup tightening instrument, comprising: a control terminal and the above-mentioned moisture permeable cup tightening device, wherein the control terminal is communicatively connected with the driving mechanism.

[0023] Furthermore, the control terminal is communicatively connected with the motor, the electromagnet and the torque sensing element.

[0024] Furthermore, it also includes a quantitative water adding device and a lighting device. The quantitative water adding device includes a water pump and a water pump motor. The water pump motor and the lighting device are both communicatively connected to the control terminal.

[0025] A fourth aspect of the present invention provides a method for tightening a moisture permeable cup.

[0026] A method for tightening a moisture permeable cup, using the above-mentioned moisture permeable cup tightening instrument, includes the following steps:

[0027] The lighting device is turned on;

[0028] Put the receiving member into the fixing seat, and rotate the receiving member so that the first groove on the receiving member matches with the first tenon;

[0029] Add a specified level of distilled water into the container through a quantitative water adding device and place the sample;

[0030] Install the pressing member to the receiving member so that the sample is clamped between the receiving member and the pressing member;

[0031] When the electromagnet is not energized, the handle is operated to move the tightening member downward and fall onto the pressing member, and the handle is turned to lock the second tenon into the second groove of the pressing member;

[0032] When the electromagnet is energized, the clutch body attracts the friction plate, and transmits the rotation of the motor to the tightening member through the driving gear and the driven gear, thereby driving the pressing member to rotate, and realizing the tightening of the pressing member and the receiving member;

[0033] When the motor rotates in the reverse direction and the electromagnet is energized, the clutch body attracts the friction plate and transmits the rotation of the motor to the tightening member through the driving gear and the driven gear, driving the pressing member to rotate and realizing the opening of the pressing member and the receiving member.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. The moisture permeable cup tightening device, tightening instrument and tightening method of the present invention change the process of clamping the sample with the moisture permeable cup from manual operation to automatic control operation, which reduces the intensity of manual operation and improves work efficiency.

[0036] 2. The moisture permeable cup tightening device, tightening instrument and tightening method of the present invention ensure the consistency of the clamping force of the moisture permeable cup on the film sample by setting a torque sensor element, making the test result more accurate.

[0037] 3. The moisture permeable cup tightening device, tightening instrument and tightening method of the present invention can freely adjust the rotation angle of the moisture permeable cup tightening disk through the design of the handle, so that the second tenon is just inserted into the second groove on the moisture permeable cup pressure ring.

[0038] 4. The moisture permeable cup tightening device, tightening instrument and tightening method, the design of the water pump and the water pump motor of the present invention can quantitatively add water of a specified liquid level, avoid the difference in liquid level caused by manual operation, and increase the accuracy of the test results.

[0039] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0041] Figure 1 This is a schematic structural diagram of a moisture permeable cup tightening device provided in Example 1 of the present invention.

[0042] Figure 2 This is a schematic diagram of a pressing handle of a moisture permeable cup tightening device provided in Example 1 of the present invention.

[0043] Figure 3 This is a schematic diagram of a moisture permeable cup tightening instrument provided in Example 2 of the present invention.

[0044] 1. Torque sensing element; 2. Permeable cup fixing plate; 3. Permeable cup body; 4. First latch; 5. Permeable cup pressure ring; 6. Second latch; 7. Permeable cup tightening plate; 8. Spline shaft; 9. Electromagnet; 10. Flat key; 11. Clutch body; 12. Friction plate; 13. Driven gear; 14. Spline sleeve; 15. Handle; 16. Driving gear; 17. Motor; 18. Frame;

[0045] 100. Tightening device for moisture permeable cup; 200. Water pump; 300. Water pump motor; 400. Lighting device; 500. Electrical circuit; 600. Control terminal. DETAILED DESCRIPTION

[0046] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0047] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0048] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0049] In the present invention, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present invention, and do not specifically refer to any part or element in the present invention and should not be understood as limitations on the present invention.

[0050] In the present invention, terms such as "fixed connection", "connected", "connection", etc. should be understood in a broad sense, indicating that it can be fixedly connected, integrally connected or detachably connected; it can be directly connected or indirectly connected through an intermediate medium. Relevant scientific research or technical personnel in this field can determine the specific meanings of the above terms in the present invention according to specific circumstances, and they should not be understood as limiting the present invention.

[0051] In the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0052] Embodiment 1:

[0053] like Figure 1 and Figure 2 As shown, Embodiment 1 of the present invention provides a moisture permeable cup tightening device, the moisture permeable cup comprises a receiving member and a pressing member, the pressing member is used to press the sample onto the receiving member, the tightening device comprises: a fixing seat, a tightening member, a connecting member and a driving mechanism;

[0054] The fixing seat is provided with a first tenon 4 which cooperates with a first groove at the bottom and / or side of the receiving member, one side of the tightening member is connected to the connecting member, and a second tenon 6 which cooperates with a second groove of the pressing member is provided on the side of the tightening member away from the connecting member;

[0055] The fixing seat is connected with a torque sensing element 1, and the connecting piece is connected with the driving mechanism. The connecting piece can drive the tightening piece to rotate under the cooperation of the driving mechanism, and then drive the pressing piece to rotate and press onto the receiving piece.

[0056] In this embodiment, the containing member is a moisture permeable cup body 3, the pressing member is a moisture permeable cup pressing ring 5, the fixing seat is a moisture permeable cup fixing plate 2, the tightening member is a moisture permeable cup tightening plate 7, and the connecting member is a spline shaft 8. One end of the spline shaft 8 is connected to one side of the moisture permeable cup tightening plate 7, and the other end of the spline shaft 8 is connected to the handle 15.

[0057] In this embodiment, the driving mechanism includes: a flat key 10, an electromagnetic clutch, a spline sleeve 14, a driving gear 16, a driven gear 13 and a motor 17. The spline sleeve 14 is sleeved and key-connected to the outside of the spline shaft 8. The electromagnetic clutch is sleeved on the outside of the spline sleeve and connected to the spline sleeve 14 through the flat key 10.

[0058] The driven gear 13 is sleeved on the outside of the spline sleeve 14, and the driven gear 13 is meshed with the driving gear 16, and the driving gear 16 can rotate under the drive of the motor 17. The electromagnetic clutch includes an electromagnet 9 and a clutch body 11. The driven gear 13 is connected to a friction plate 12, and the friction plate 12 is opposite to the clutch body 11.

[0059] It is understandable that in some other embodiments, other motor mechanisms may also be provided, as long as the motor can drive the connection member to rotate. Those skilled in the art may make a selection based on specific working conditions, which will not be elaborated here.

[0060] A space for placing the moisture permeable cup body 3 is opened on the moisture permeable cup fixing plate 2 , and a first tenon 4 is provided in the space and / or on the upper edge of the moisture permeable cup fixing plate 2 .

[0061] It also includes a frame 18, on which the moisture permeable cup fixing plate 2, the electromagnet and the motor are all fixed, and a torque sensing element is arranged at the connection position between the fixing seat and the frame.

[0062] In this embodiment, the first tenon 4 and / or the second tenon 6 are made of non-metallic material.

[0063] The first tenon 4 and the second tenon 6 are preferably made of rubber material. It is understandable that in some other embodiments, the first tenon 4 and the second tenon 6 can also be made of other non-metallic materials such as plastic, as long as they can be tightened with the grooves on the moisture permeable cup body or the moisture permeable cup pressure ring. Technical personnel in this field can make the selection according to the specific working conditions, which will not be repeated here.

[0064] Preferably, the number of the first tenons 4 and the second tenons 6 are three, and the adjacent tenons are symmetrically arranged at an angle of 120 degrees. It can be understood that in some other embodiments, the number of tenons can be other numbers, as long as they can be tightened with the grooves on the moisture permeable cup body or the moisture permeable cup pressure ring; technical personnel in this field can make a choice according to the specific working conditions, which will not be repeated here.

[0065] In this embodiment, the torque sensor element 1, the moisture permeable cup fixing plate 2, the electromagnet 9, and the motor 17 are fixed on the frame 18 and cannot be moved. The moisture permeable cup tightening plate 7, the spline shaft 8, the flat key 10, the clutch body 11, the spline sleeve 14 and the handle 15 rotate together. The moisture permeable cup tightening plate 7, the spline shaft 8 and the handle 15 can move up and down together. The driving gear 16 can drive the driven gear 13 and the friction plate 12 to rotate together under the drive of the motor 17.

[0066] It can be understood that in some other embodiments, the handle is directly used as a driving mechanism, one end of the connecting member is connected to one side of the breathable cup tightening disk, and the other end of the connecting member is connected to the handle, and the handle drives the connecting member to rotate, thereby driving the breathable cup tightening disk to rotate.

[0067] The specific workflow is as follows:

[0068] During operation, first place the breathable cup body 3 into the breathable cup fixing plate 2, and rotate it so that the first groove on the breathable cup body 3 matches with the first tenon 4; then add distilled water of a specified liquid level into the breathable cup body 3 and place the sample; then install the breathable cup pressure ring 5 to the breathable cup body 3, so that the sample is clamped between the breathable cup body 3 and the breathable cup pressure ring 5.

[0069] When the electromagnet 9 is not energized, the handle 15 is pressed down to make the spline shaft move downward with the breathable cup tightening disk in the spline sleeve and fall on the breathable cup pressing ring, and the handle 15 is rotated to make the second tenon fit into the second groove on the breathable cup pressing ring.

[0070] The electromagnet 9 is energized to make the clutch body 11 attract the friction plate 12. At this time, the rotation of the motor 17 can be transmitted to the moisture permeable cup tightening disk 7 through the driving gear 16, the driven gear 13, the friction plate 12, the clutch body 11, the flat key 10, the spline sleeve 14 and the spline shaft 8 in sequence, thereby driving the moisture permeable cup pressure ring 5 to rotate, and realizing the tightening of the moisture permeable cup pressure ring 5 and the moisture permeable cup body 3.

[0071] Since the position of the second groove on the moisture permeable cup pressing ring 5 is uncertain, the second tenon 6 is aligned and inserted into the second groove on the moisture permeable cup pressing ring 5 by manually rotating the handle 15. The electromagnet 9 and the clutch body 11 cooperate to make the driven gear 13 idle or rotate with the spline sleeve 14 as the axis. That is, when the electromagnet 9 is not energized, the handle 15 can be manually operated to rotate the moisture permeable cup tightening disk 7 to any position; when the electromagnet 9 is energized, only the motor 17 can provide power to rotate the moisture permeable cup tightening disk 7.

[0072] During the tightening process, the torque sensor element 1 detects the torque value in real time. When the torque sensor element 1 detects that the torque value reaches the specified requirement, the power supply of the electromagnet 9 is quickly cut off to stop the transmission between the motor 17 and the moisture permeable cup tightening disk 7.

[0073] Embodiment 2:

[0074] like Figure 3 As shown, Example 2 of the present invention provides a moisture permeable cup tightening instrument, including a control terminal 600, the moisture permeable cup tightening device 100 described in Example 1, a moisture permeable cup quantitative water adding device and a lighting device 400. The control terminal 600 is connected to the electromagnet 9, the lighting device 400, the water pump motor 300, the torque sensor element 1 and the motor 17 through an electrical circuit 500.

[0075] The control terminal 600 can realize the idle rotation or co-rotation of the driven gear 13 by controlling the power on and off of the electromagnet 9, thereby realizing the tightening of the moisture permeable cup pressure ring 5 and the moisture permeable cup body 3;

[0076] By controlling the power on and off of the lighting device 400, the light source can be turned on or off, so that the operator can observe the internal working conditions of the tightening instrument; by controlling the water pump motor 300 to rotate a certain number of times, the water pump 200 pumps a certain volume of water into the permeable cup 3. Since the volume of the permeable cup is fixed, a fixed level of water can be added to the permeable cup 3;

[0077] By receiving the data of the torque sensor element 1, the actual torque value when the moisture permeable cup is tightened or opened can be known. When the specified requirement is reached, the electromagnet 9 can be controlled to be powered off to stop the transmission between the motor 17 and the moisture permeable cup tightening disk 7; by controlling the motor 17 to rotate forward or reverse, the moisture permeable cup tightening device 100 can be tightened or opened.

[0078] The specific working methods are:

[0079] First, the lighting device is turned on;

[0080] Put the moisture permeable cup body into the moisture permeable cup fixing plate, and rotate it so that the first groove on the moisture permeable cup body matches with the first tenon;

[0081] Add distilled water to the specified level into the moisture permeable cup and place the sample;

[0082] Install the moisture permeable cup pressure ring to the moisture permeable cup body so that the sample is sandwiched between the moisture permeable cup body and the moisture permeable cup pressure ring;

[0083] When the electromagnet 9 is not energized, the handle 15 is pressed down to make the spline shaft move downward with the breathable cup tightening disk in the spline sleeve and fall on the breathable cup pressing ring, and the handle 15 is rotated to make the second tenon fit into the second groove on the breathable cup pressing ring.

[0084] When the electromagnet 9 is energized, the clutch body 11 attracts the friction plate 12, and the rotation of the motor 17 is transmitted to the moisture permeable cup tightening disk 7 through the driving gear 16 and the driven gear 13, thereby driving the moisture permeable cup pressure ring 5 to rotate, thereby realizing the tightening of the moisture permeable cup pressure ring 5 and the moisture permeable cup body 3.

[0085] When the motor 17 is reversed and the electromagnet 9 is energized, the clutch body 11 attracts the friction plate 12. At this time, the rotation of the motor 17 can be transmitted to the moisture permeable cup tightening disk 7 through the driving gear 16 and the driven gear 13, thereby driving the moisture permeable cup pressure ring 5 to rotate, thereby realizing the opening of the moisture permeable cup pressure ring 5 and the moisture permeable cup body 3.

[0086] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A moisture permeable cup tightening device, the moisture permeable cup comprising a receiving part and a pressing part, the pressing part is used to press the sample on the receiving part, characterized in that: The tightening device comprises: a fixing seat, a tightening member, a connecting member and a driving mechanism; The fixing seat is provided with a first tenon matched with a first groove at the bottom and / or side of the accommodating member, one side of the tightening member is connected to the connecting member, and a second tenon matched with a second groove of the pressing member is provided on a side of the tightening member away from the connecting member; The fixing seat is connected with a torque sensing element, the connecting piece is connected with the driving mechanism, and the connecting piece can drive the tightening piece to rotate under the cooperation of the driving mechanism, thereby driving the pressing piece to rotate and press onto the receiving piece; The connecting member is a spline shaft, one end of the spline shaft is connected to one side of the tightening member, and the other end of the spline shaft is connected to the handle; The driving mechanism includes: a flat key, an electromagnetic clutch, a spline sleeve, a driving gear, a driven gear and a motor. The spline sleeve is sleeved and key-connected to the outside of the spline shaft. The electromagnetic clutch is sleeved to the outside of the spline sleeve and connected to the spline sleeve through a flat key. The driven gear sleeve is arranged on the outside of the spline sleeve, the driven gear is meshed with the driving gear, and the driving gear can rotate under the drive of the motor, the electromagnetic clutch includes an electromagnet and a clutch body, the driven gear is connected with a friction plate, and the friction plate is opposite to the clutch body; The fixing seat is provided with a space for placing the receiving member, and a first tenon is provided in the space and / or on the upper edge of the fixing seat; When the electromagnet is not energized, the handle drives the connecting piece to rotate, thereby driving the tightening piece to rotate.

2. The moisture permeable cup tightening device according to claim 1, characterized in that: It also includes a frame, a fixing seat, an electromagnet and a motor are all fixed on the frame, and a torque sensor element is arranged at a connection position between the fixing seat and the frame.

3. The moisture permeable cup tightening device according to claim 1, characterized in that: The first tenon and / or the second tenon are made of non-metallic material.

4. A method for tightening a moisture permeable cup, characterized in that: Using the moisture permeable cup tightening device according to claim 1 or 2, The process includes: When the electromagnet is not energized, the handle is operated to move the tightening member downward and fall onto the pressing member, and the handle is turned to lock the second tenon into the second groove of the pressing member; When the electromagnet is energized, the clutch body attracts the friction plate, and transmits the rotation of the motor to the tightening member through the driving gear and the driven gear, thereby driving the pressing member to rotate, and realizing the tightening of the pressing member and the receiving member; When the motor rotates in the reverse direction and the electromagnet is energized, the clutch body attracts the friction plate and transmits the rotation of the motor to the tightening member through the driving gear and the driven gear, driving the pressing member to rotate and realizing the opening of the pressing member and the receiving member.

5. A moisture permeable cup tightening instrument, characterized in that: include: A control terminal and a moisture permeable cup tightening device as described in any one of claims 1 to 3, wherein the control terminal is communicatively connected with the driving mechanism.

6. The moisture permeable cup tightening instrument according to claim 5, characterized in that: The control terminal is in communication connection with the motor, the electromagnet and the torque sensing element.

7. The moisture permeable cup tightening instrument according to claim 5, characterized in that: It also includes a quantitative water adding device and a lighting device. The quantitative water adding device includes a water pump and a water pump motor. The water pump motor and the lighting device are both communicatively connected to the control terminal.

8. A method for tightening a moisture permeable cup, characterized in that: Using the moisture permeable cup tightening instrument according to claim 7, The process includes: The lighting device is turned on; Put the receiving member into the fixing seat, and rotate the receiving member so that the first groove on the receiving member matches with the first tenon; Add a specified level of distilled water into the container through a quantitative water adding device and place the sample; Install the pressing member to the receiving member so that the sample is clamped between the receiving member and the pressing member; When the electromagnet is not energized, the handle is operated to move the tightening member downward and fall onto the pressing member, and the handle is turned to lock the second tenon into the second groove of the pressing member; When the electromagnet is energized, the clutch body attracts the friction plate, and transmits the rotation of the motor to the tightening member through the driving gear and the driven gear, thereby driving the pressing member to rotate, and realizing the tightening of the pressing member and the receiving member; When the motor rotates in the reverse direction and the electromagnet is energized, the clutch body attracts the friction plate and transmits the rotation of the motor to the tightening member through the driving gear and the driven gear, driving the pressing member to rotate and realizing the opening of the pressing member and the receiving member.

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