Pressure device for restraining tray

Abstract

The utility model provides a restraining tray pressurizing device which comprises a base. The first end plate and the second end plate are arranged at the head end and the tail end of the base; a pressing plate; the driving mechanism is used for driving the pressurizing plate to move along the length direction of the guide rod; the driving mechanism comprises a lead screw, a bearing cover, a bearing and a locking assembly. According to the restraining tray pressurizing device, advancing or retreating of the pressurizing plate can be achieved by rotating the lead screw in the forward direction or the reverse direction, and operation is convenient; moreover, the bearing is arranged in the containing space defined by the lead screw, the pressurizing plate and the bearing cover and is isolated from the outside, so that adverse effects on the bearing due to external pollution, damage and the like are prevented, the safety and the reliability of the bearing are effectively improved, and the machining precision is more stable.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, in particular to a restraining tray pressurizing device. Background Art

[0002] Lithium batteries are a type of battery that uses lithium metal or lithium alloy as positive / negative electrode materials and non-aqueous electrolyte solutions. They have the advantages of high storage energy density, long service life, high power tolerance, light weight, and green environmental protection, and are widely used in electronic products, electric vehicles, and other fields. In the production process of lithium batteries, the restraint tray pressurizing device is used to constrain the lithium battery in the restraint tray to ensure that its size does not exceed the limit.

[0003] The current restraint tray pressurizing device generally drives the pressure plate to move to pressurize the lithium battery by rotating the screw. The traditional screw is generally installed on the end plate. When pressurizing, the screw contacts the pressure plate and separates from the pressure plate when the screw returns to the initial position. If the pressure plate is to be returned to the initial position, an additional retraction device is required to retract the pressure plate, which is inconvenient to operate. Utility Model Content

[0004] The purpose of the present application is to solve the above-mentioned problem and provide a restraining tray pressurizing device to solve the technical problem of the inconvenience of operating the pressurizing plate back to its initial position.

[0005] To achieve the above objectives, the present application provides a restraining tray pressurizing device, comprising:

[0006] Base;

[0007] A first end plate and a second end plate, wherein the first end plate and the second end plate are arranged oppositely at the front and rear ends of the base, and a guide rod is arranged between the first end plate and the second end plate, and the guide rod is perpendicular to the end surfaces of the first end plate and the second end plate;

[0008] A pressure plate, which is sleeved on the guide rod and parallel to the first end plate;

[0009] A driving mechanism for driving the pressure plate to move along the length direction of the guide rod, wherein the driving mechanism is arranged between the pressure plate and the first end plate; the driving mechanism comprises a screw rod, a bearing cover, a bearing and a locking assembly, the screw rod is threadedly connected to the first end plate and passes through the first end plate, the bearing is provided at one end of the screw rod close to the pressure plate, the locking assembly locks the bearing at the end face of the screw rod, the outer diameter of the bearing is larger than the outer diameter of the screw rod, the bearing and the screw rod cooperate to form a first assembly step, the inner wall of the bearing cover is provided with a second assembly step, the bearing cover is sleeved on the screw rod, covers the bearing, and is detachably fixed to the pressure plate, the first assembly step matches the second assembly step, the screw rod, the pressure plate and the bearing cover form a receiving space, and the bearing is located in the receiving space.

[0010] Compared with the prior art, the utility model provides a restraint tray pressurizing device, in which the screw rod is fixedly connected to the pressurizing plate, and the pressurizing plate can be moved forward or backward by rotating the screw rod in the forward or reverse direction, which is easy to operate; and the bearing is placed in a receiving space surrounded by the screw rod, the pressurizing plate and the bearing cover, which is isolated from the outside world to prevent adverse effects on the bearing due to external pollution and damage, thereby effectively improving its safety and reliability and making the processing accuracy more stable.

[0011] In one embodiment, the locking assembly includes a rotating shaft and a stud, one end of the rotating shaft is provided with a limiting boss, the rotating shaft passes through the inner ring of the bearing, the limiting boss abuts against the end face of the bearing, the rotating shaft and the limiting boss are provided with a first through hole, the end of the screw rod close to the pressure plate is provided with a first threaded hole, the stud passes through the first through hole and is threadedly connected with the first threaded hole, and the bearing is fixed to the end of the screw rod close to the pressure plate. The rotating shaft is fixedly connected to the screw rod by the stud, and the pressure plate can be reciprocated by rotating the screw rod, which is convenient for operation.

[0012] In one embodiment, an end of the screw rod close to the pressure plate is further provided with an assembly groove, and the rotating shaft protrudes from the bearing and extends into the assembly groove, so as to facilitate the coaxial assembly of the rotating shaft and the screw rod.

[0013] In one embodiment, the pressure plate is provided with a groove, and the limiting boss is received in the groove, so that the limiting boss is isolated from the outside world, thereby protecting the rotating shaft.

[0014] In one embodiment, the bearing cover is provided with a plurality of second through holes, the pressure plate is provided with a plurality of second threaded holes, the second through holes are arranged corresponding to the second threaded holes, and the bearing cover is threadedly connected to the pressure plate through screws and the second threaded holes, so as to facilitate fixing of the bearing cover.

[0015] In one embodiment, the drive mechanism further includes a screw seat, the first end plate is provided with a mounting hole, the screw seat is fixed to the mounting hole, a third threaded hole is provided inside the screw seat, the screw is threadedly connected to the third threaded hole, and passes through the screw seat and the first end plate to be connected to the bearing. The screw seat can increase the movement stroke of the screw and further pressurize the lithium battery.

[0016] In one embodiment, the mounting hole includes a through portion and a first limiting portion, the longitudinal section of the screw seat is a T-shaped section, the screw seat abuts against the first limiting portion after passing through the through portion, and the end surface of the screw seat close to the pressure plate is flush with the end surface of the first end plate close to the pressure plate. The screw seat can increase the matching length of the screw and the first end plate, thereby increasing stability.

[0017] In one embodiment, a travel limit rod is further included for limiting the travel of the screw rod, the travel limit rod is parallel to the guide rod and fixed to the pressure plate; the first end plate is provided with a through hole, the travel limit rod passes through the through hole and is slidably connected to the first end plate. The travel limit rod limits the travel of the screw rod and can also assist the movement of the screw rod.

[0018] In one embodiment, the travel limit rod includes a fixing portion, a second limiting portion and a travel column, the fixing portion is arranged at one end of the travel column close to the pressure plate and is fixed to the pressure plate, the travel column passes through the through hole, and its length is less than the length of the screw rod, and the second limiting portion is arranged at one end of the travel column away from the pressure plate, and its outer diameter is greater than the inner diameter of the through hole.

[0019] In one embodiment, a boss is provided at one end of the screw rod close to the first end plate, and a force applying member is provided on the boss to facilitate force application. The force applying member is convenient for the robot to grasp and apply force.

[0020] For better understanding and implementation, the present application is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a restraint tray pressurizing device in one embodiment of the present application;

[0022] Figure 2 It is a structural schematic diagram of another angle of the restraint tray pressurizing device in one embodiment of the present application;

[0023] Figure 3 In one embodiment of the present application Figure 2 Cross-sectional view in the AA direction;

[0024] Figure 4 This is a schematic structural diagram of a first end plate in one embodiment of the present application;

[0025] Figure 5 This is a schematic diagram of the structure of a pressure plate in one embodiment of the present application;

[0026] Figure 6 This is a schematic diagram of the structure of a screw rod in one embodiment of the present application;

[0027] Figure 7 It is a partial schematic diagram of a restraint tray pressurizing device in one embodiment of the present application;

[0028] Figure 8 This is a schematic diagram of the structure of a bearing cover in one embodiment of the present application;

[0029] Fig. 9 This is a schematic diagram of the structure of a rotating shaft in one embodiment of the present application;

[0030] Fig.10 This is a schematic diagram of the structure of a screw rod seat in one embodiment of the present application;

[0031] Fig.11 This is a schematic diagram of the structure of a travel limit rod in one embodiment of the present application.

[0032] Numbers in the figure:

[0033] 1-base, 2-first end plate, 3-second end plate, 4-guide rod, 5-pressure plate, 6-driving mechanism, 7-stroke limiting rod, 21-mounting hole, 22-through hole, 51-groove, 52-second threaded hole, 61-screw, 62-bearing cover, 63-bearing, 64-locking assembly, 65-screw seat, 66-force member, 71-fixing part, 72-second limiting part, 73-stroke column, 211-through part, 212-first limiting part, 611-first threaded hole, 612-assembly groove, 613-boss, 621-second through hole, 641-rotating shaft, 642-stud, 651-third threaded hole, 6411-limiting boss, 6412-first through hole, a-first assembly step, b-second assembly step. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the present application. It is understood that the drawings are only provided for reference and illustration, and are not used to limit the present application. The connection relationship shown in the drawings is only for the convenience of clear description and does not limit the connection method.

[0035] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component, or there may be an intermediate component at the same time. Unless otherwise defined, all technical and scientific terms used in this document have the same meaning as those generally understood by technicians in the technical field of this application. It should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. The terms used in this document in the specification of this application are only for the purpose of describing specific embodiments, and are not intended to limit this application.

[0036] It should also be noted that in the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0037] Please also read Figures 1 to 3, the present embodiment provides a restraining tray pressurizing device, specifically, the restraining tray pressurizing device includes a base 1; a first end plate 2 and a second end plate 3, the first end plate 2 and the second end plate 3 are relatively arranged at the head and tail ends of the base 1, a guide rod 4 is provided between the first end plate 2 and the second end plate 3, the guide rod 4 is perpendicular to the end surfaces of the first end plate 2 and the second end plate 3; a pressurizing plate 5, the pressurizing plate 5 is sleeved on the guide rod 4 and is parallel to the first end plate 2; a driving mechanism 6 for driving the pressurizing plate 5 to move along the length direction of the guide rod 4, the driving mechanism 6 is arranged between the pressurizing plate 5 and the first end plate 2; the driving mechanism 6 includes a screw 61, a bearing cover 62, a bearing 63 and a locking assembly 64, the screw The rod 61 is threadedly connected to the first end plate 2 and passes through the first end plate 2. The bearing 63 is provided at one end of the screw rod 61 close to the pressure plate 5. The locking assembly 64 locks the bearing 63 at the end face of the screw rod 61. The outer diameter of the bearing 63 is larger than the outer diameter of the screw rod 61. The bearing 63 and the screw rod 61 cooperate to form a first assembly step a. The inner wall of the bearing cover 62 is provided with a second assembly step b. After the bearing cover 62 is sleeved on the screw rod 61, it covers the bearing 63 and is detachably fixed on the pressure plate 5. The first assembly step a matches the second assembly step b. The screw rod 61, the pressure plate 5 and the bearing cover 62 form a receiving space, and the bearing 63 is located in the receiving space.

[0038] The base 1 is a rectangular parallelepiped structure, and the upper plane of the base 1 is used to install the battery partition, and the partition is sleeved on the guide rod 4 along the length direction of the base 1, and a receiving space for accommodating the battery is formed between adjacent partitions. The driving mechanism 6 drives the pressure plate 5 to approach the partition, and the partition squeezes the battery under pressure. In other embodiments, the base 1 can also be a columnar structure or a structure of other shapes.

[0039] The first end plate 2 and the second end plate 3 are fixed to the base 1 at both ends by screws. In another embodiment, the first end plate 2 and the second end plate 3 can also be fixed to the base 1 by means of buckles, welding, etc.

[0040] Please also read Figure 3 , Figure 4 and Fig.10The driving mechanism 6 further includes a screw seat 65. The first end plate 2 is provided with a mounting hole 21. The screw seat 65 is fixed to the mounting hole 21. A third threaded hole 651 is provided inside the screw seat 65. The screw 61 is threadedly connected with the third threaded hole 651 and passes through the screw seat 65 and the first end plate 2 to be connected with the bearing 63. The screw seat 65 is used to increase the matching length between the screw 61 and the first end plate 2 and enhance the matching stability. Specifically, the screw seat 65 protrudes from the end surface of the first end plate 2 away from the pressure plate 5.

[0041] The mounting hole 21 includes a through portion 211 and a first limiting portion 212. The longitudinal section of the screw seat 65 is a T-shaped section. After passing through the through portion 211, the screw seat 65 abuts against the first limiting portion 212, which facilitates the assembly of the screw seat 65 on the first end plate 2. The end surface of the screw seat 65 close to the pressure plate 5 is flush with the end surface of the first end plate 2 close to the pressure plate 5, so as to prevent the screw seat 65 from affecting the rotation stroke of the screw 61.

[0042] Please also read Figure 3 and Fig. 9 The locking assembly 64 includes a rotating shaft 641 and a stud 642. A limiting boss 6411 is provided at one end of the rotating shaft 641. The limiting boss 6411 has a circular cross section. The rotating shaft 641 passes through the inner ring of the bearing 63. The limiting boss 6411 abuts against the end face of the bearing 63. The rotating shaft 641 is provided with a first through hole 6412. A first threaded hole 611 is provided at one end of the screw rod 61 close to the pressure plate 5. The stud 642 passes through the first through hole 6412 and is threadedly connected with the first threaded hole 611. The rotating shaft 641 is fixedly connected to the screw rod 61 by the stud 642. When the screw rod 61 rotates, the rotating shaft 641 can be driven to rotate in the bearing 63, so that the screw rod 61 rotates more smoothly, and the effect of the lateral force formed by the rotation of the screw rod 61 on the pressure plate 5 can be reduced, thereby improving the pressure accuracy. The first through hole 6412 is a countersunk hole, and the stud 642 is a countersunk stud, which can avoid the stud head of the stud 642 from interfering with the pressure plate 5. In another embodiment, the first through hole 6412 can also be an ordinary through hole, the stud 642 is an ordinary stud, and the pressure plate 5 is provided with an opening to avoid interference with the stud 642. In another embodiment, the cross section of the limiting boss 6411 can also be a square cross section or a cross section of other shapes. In another embodiment, the rotating shaft 641 is threadedly connected to the screw rod 61.

[0043] Please also read Figure 3 and Figure 6, the end of the screw rod 61 close to the pressure plate 5 is also provided with a mounting groove 612, and the rotating shaft 641 protrudes from the bearing 63 and extends into the mounting groove 612. The inner diameter of the mounting groove 612 is equal to the outer diameter of the rotating shaft 641. After the rotating shaft 641 extends into the mounting groove 612, it is convenient to align the first through hole 6412 with the first threaded hole 611, which is convenient for screw fixing; and the mounting groove 612 limits the radial movement of the rotating shaft 641, thereby improving the stability of the screw rod 61 during rotation and pressure. In another embodiment, a plurality of positioning columns are provided at the end of the rotating shaft 641 away from the limiting boss 6411, and a plurality of positioning holes cooperating with the positioning columns are provided at the end of the screw rod 61 close to the pressure plate 5. After the positioning columns are inserted into the positioning holes, the first through hole 6412 can be aligned with the first threaded hole 611, which is convenient for screw fixing and can also limit the radial movement of the rotating shaft 641.

[0044] Please also read Figure 3 , Figure 6 and Figure 7 , a boss 613 is provided at one end of the screw rod 61 close to the first end plate 2, and a force-applying member 66 is provided on the boss 613 for convenient force application. The force-applying member 66 facilitates the manipulator to grab the screw rod 61 and rotate and apply force. The boss 613 is a cylindrical structure, and the force-applying member 66 includes a latch, which is arranged through the side of the boss 613. The manipulator can grab the latch and apply force to rotate the screw rod 61. In another embodiment, the boss 613 can also be a square structure.

[0045] Please also read Figure 3 and Figure 5 In this embodiment, the pressure plate 5 is provided with a groove 51, and the limiting boss 6411 is received in the groove 51. The limiting boss 6411 is isolated from the outside world, which plays a role in protecting the rotating shaft 641, slowing down the oxidation of the rotating shaft 641, and improving the service life of the rotating shaft 641. The groove 51 is a circular groove. In other embodiments, the groove 51 can also be a square groove or a groove of other shapes.

[0046] Please also read Figure 3 , Figure 5 and Figure 8, the bearing cover 62 is provided with a plurality of second through holes 621, and the pressure plate 5 is provided with a plurality of second threaded holes 52, the second through holes 621 are arranged corresponding to the second threaded holes 52, and the bearing cover 62 is threadedly connected to the second threaded holes 52 by screws and fixed to the pressure plate 5. The number of the second through holes 621 is 4, and they are symmetrical about the axis center of the bearing cover 62 to ensure that the bearing cover 62 is balanced in force. The second through hole 621 is a countersunk hole, and the bearing cover 62 is threadedly connected to the second threaded hole 52 by a countersunk screw and fixed to the pressure plate 5, which can prevent the column head of the screw from protruding from the bearing cover 62 and reduce the stroke of the screw rod 61. In other embodiments, the number of the second through holes 621 can also be 3, 5 or other numbers. In other embodiments, the second through hole 621 can also be an ordinary through hole.

[0047] Please also read Figure 1 , Figure 7 and Fig.11 , and also includes a travel limiting rod 7 for limiting the travel of the screw rod 61, the travel limiting rod 7 is parallel to the guide rod 4, and is fixed to the pressure plate 5; the first end plate 2 is provided with a through hole 22, and the travel limiting rod 7 passes through the through hole 22 and is slidably connected to the first end plate 2. The travel limiting rod 7 is symmetrically arranged on both sides of the driving mechanism 6 to prevent the travel limiting rod 7 from being arranged on one side, which causes uneven force on the pressure plate.

[0048] The travel limit rod 7 includes a fixing portion 71, a second limiting portion 72 and a travel column 73. The fixing portion 71 is arranged at one end of the travel column 73 close to the pressure plate 5 and fixed to the pressure plate 5. The fixing portion 71 is a cylinder with an outer diameter greater than the inner diameter of the through hole 22. The second limiting portion 72 is arranged at one end of the travel column 73 away from the pressure plate 5, and its outer diameter is greater than the inner diameter of the through hole 22. The cross section of the second limiting portion 72 is a circular cross section. The travel column 73 passes through the through hole 22, and its length is less than the length of the screw rod 61. The second limiting portion 72 is threadedly connected to the travel column 73. The travel column 73 and the fixing portion 71 are integrally formed. The fixing portion 71 is mounted on the pressure plate 5 by screw fixing. In another embodiment, the stroke column 73 has a telescopic structure, and the length of the stroke column 73 can be adjusted according to the required degree of pressurization; or, a second stud is provided at one end of the second limiting portion 72, and an internal thread is provided at one end of the stroke column 73 close to the second limiting portion 72, and the second stud is cooperatively connected with the internal thread, and the stroke adjustment of the stroke limit rod 7 is achieved by adjusting the depth of the second stud screwed into the internal thread and locking the second limiting portion 72 on the stroke column 73 by a nut.

[0049] The working process of the present application is as follows: when pressurizing, the manipulator rotates the screw rod 61, the screw rod 61 applies pressure to the bearing 63, the bearing 63 applies pressure to the pressure plate 5, and the pressure plate 5 squeezes the battery in the direction of the second end plate 3; after the pressurization is stopped, the manipulator rotates the screw rod 61 in the opposite direction, the screw rod 61 pulls the rotating shaft 641, the limiting boss 6411 of the rotating shaft 641 applies thrust to the bearing 63, the bearing 63 applies thrust to the bearing cover 62, and the pressure plate 5 fixedly connected to the bearing cover 62 moves along the direction of the first end plate 2 under the action of the thrust.

[0050] The specific examples described above further illustrate the purpose, technical solutions and beneficial effects of the present application in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A restraint tray pressurizing device, characterized in that: include: Base; A first end plate and a second end plate, wherein the first end plate and the second end plate are arranged oppositely at the front and rear ends of the base, and a guide rod is arranged between the first end plate and the second end plate, and the guide rod is perpendicular to the end surfaces of the first end plate and the second end plate; A pressure plate, the pressure plate is sleeved on the guide rod and is parallel to the first end plate; A driving mechanism for driving the pressure plate to move along the length direction of the guide rod, the driving mechanism comprising a screw, a bearing cover, a bearing and a locking assembly, the screw is threadedly connected to the first end plate and passes through the first end plate, the bearing is fixed to an end of the screw close to the pressure plate through the locking assembly, the outer diameter of the bearing is larger than the outer diameter of the screw, a first assembly step is formed between the outer circumferential surface of the bearing and the outer circumferential surface of the screw, the bearing cover is detachably fixed to the pressure plate, the pressure plate and the bearing cover form a receiving space, the bearing is located in the receiving space, the screw passes through the bearing cover, the inner wall of the bearing cover is provided with a second assembly step, and the second assembly step covers the first assembly step.

2. The restraint tray pressurizing device according to claim 1, characterized in that: The locking assembly includes a rotating shaft and a stud, a limiting boss is provided at one end of the rotating shaft, the rotating shaft passes through the inner ring of the bearing, the limiting boss abuts against the end face of the bearing, the rotating shaft is provided with a first through hole, and a first threaded hole is provided at one end of the screw rod close to the pressure plate, the stud passes through the first through hole and is threadedly connected to the first threaded hole to fix the bearing at one end of the screw rod close to the pressure plate.

3. The restraint tray pressurizing device according to claim 2, characterized in that: An end of the screw rod close to the pressure plate is also provided with an assembly groove, and the rotating shaft protrudes from the bearing and extends into the assembly groove.

4. The restraint tray pressurizing device according to claim 2, characterized in that: The pressure plate is provided with a groove, and the limiting boss is received in the groove.

5. The restraint tray pressurizing device according to any one of claims 1 to 4, characterized in that: The bearing cover is provided with a plurality of second through holes, the pressure plate is provided with a plurality of second threaded holes, the second through holes are arranged corresponding to the second threaded holes, and the bearing cover is threadedly connected and fixed to the pressure plate through screws and the second threaded holes.

6. The restraint tray pressurizing device according to any one of claims 1 to 4, characterized in that: The driving mechanism also includes a screw seat, the first end plate is provided with a mounting hole, the screw seat is fixed to the mounting hole, a third threaded hole is provided inside the screw seat, the screw is threadedly connected to the third threaded hole, and passes through the screw seat and the first end plate to be connected to the bearing.

7. The restraint tray pressurizing device according to claim 6, characterized in that: The mounting hole includes a through portion and a first limiting portion. The longitudinal section of the screw seat is a T-shaped section. After the screw seat passes through the through portion, it abuts against the first limiting portion. The end surface of the screw seat close to the pressure plate is flush with the end surface of the first end plate close to the pressure plate.

8. The restraint tray pressurizing device according to any one of claims 1 to 4, characterized in that: It also includes a travel limit rod for limiting the travel of the screw rod, wherein the travel limit rod is parallel to the guide rod and is fixed to the pressure plate; The first end plate is provided with a through hole, and the travel limit rod passes through the through hole and is slidably connected to the first end plate.

9. The restraint tray pressurizing device according to claim 8, characterized in that: The stroke limit rod includes a fixing portion, a second limiting portion and a stroke column. The fixing portion is arranged at one end of the stroke column close to the pressure plate and is fixed to the pressure plate. The stroke column passes through the through hole, and its length is less than the length of the screw rod. The second limiting portion is arranged at one end of the stroke column away from the pressure plate, and its outer diameter is greater than the inner diameter of the through hole.

10. The restraint tray pressurizing device according to any one of claims 1 to 4, characterized in that: A boss is provided at one end of the screw rod close to the first end plate, and a force applying member is provided on the boss for convenient force application.

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