A handle tool for carrying an evaporation machine cooling plate

Abstract

The present application provides a handle tool for carrying an evaporation machine cooling plate, which comprises a handle, a connecting piece connected with the handle, a bolt for connection, the bolt being arranged in the middle of the connecting piece, and a supporting assembly connected with the connecting piece, two groups of the supporting assembly being arranged on the two sides of the bolt respectively. The middle of the connecting piece is provided with a first connecting part, and the two sides of the first connecting part are respectively provided with a second connecting part; one end of the bolt is connected with the first connecting part, and the other end extends to the side of the connecting piece away from the handle; the supporting assembly comprises a supporting block and a connecting piece, the supporting block is provided with a third connecting part, and the connecting piece is connected with the second connecting part and the third connecting part. When the handle tool is installed on the evaporation machine cooling plate, only a single bolt hole is needed, and the direction of the handle tool can be changed at will on the evaporation machine cooling plate according to actual needs, so as to facilitate the operator to stand at different positions to hold the handle and exert force.

Description

Technical Field

[0001] This invention relates to handle tools, and more particularly to a handle tool for carrying cooling plates of a vapor deposition machine, belonging to the field of handling auxiliary tools. Background Technology

[0002] The cooling plates inside the vapor deposition machine used to fabricate organic light-emitting diode (OLED) display devices need to be inspected and cleaned after a period of use. At present, the cooling plates can only be handled by hand during maintenance and cleaning. Direct contact with the cooling plates by hand can easily contaminate them, causing them to rust, and there are also certain safety hazards during handling. Summary of the Invention

[0003] To facilitate the handling of cooling plates and reduce the risk of the aforementioned problems, this invention provides a handle tool for handling cooling plates of a vapor deposition machine. This handle tool includes:

[0004] Handle; and

[0005] Connector to the handle; and

[0006] Bolts for external connection, with the bolts located in the middle of the connecting parts; and

[0007] Support components are connected to the connector, with two sets of support components respectively located on both sides of the bolt.

[0008] Furthermore, a first connecting portion is disposed in the middle of the connector, and a second connecting portion is disposed on each side of the first connecting portion;

[0009] One end of the bolt is connected to the first connecting part, and the other end extends toward the side of the connector away from the handle;

[0010] The support assembly includes a support block and a connector. The support block is provided with a third connecting part, and the connector is connected to the second connecting part and the third connecting part.

[0011] Furthermore, the first connecting part is configured as a welding position, a smooth hole, or a threaded hole, and the bolt is fixedly connected to the first connecting part.

[0012] Furthermore, the first connecting part is a light hole, and the bolt is inserted into the first connecting part from the side near the handle and extends to the other side of the connector away from the handle;

[0013] The bolt is equipped with a rotating handle, which is located at the end of the bolt near the handle.

[0014] Furthermore, the relative distance between the support block and the connector cannot be changed.

[0015] Furthermore, the connector is movably connected to at least one of the connecting member and the support block, and the support block can move closer to or further away from the connecting member along the connector.

[0016] Furthermore, the connector is configured as a bolted connector with threads on only one end;

[0017] One of the second connecting part and the third connecting part is configured as a threaded hole and is threadedly connected to the threaded end of the connecting member;

[0018] Another configuration of the second and third connecting parts is a light hole or a welding position, which is interference-fitted with the other end of the connecting part or welded to each other.

[0019] Furthermore, the connector is configured as a bolted connector with threads at both ends;

[0020] Both the second connecting portion and the third connecting portion are configured with threaded holes;

[0021] The two ends of the connector are threadedly connected to the second connecting part and the third connecting part, respectively; and,

[0022] The thread fit clearance between the connector and the third connecting part is different from the thread fit clearance between the connector and the second connecting part.

[0023] Furthermore, the connector is configured as a rod;

[0024] The support assembly further includes a spring, which is sleeved in the middle of the connector and compressed between the support block and the connector; and,

[0025] Optional:

[0026] Both the second and third connecting portions are configured as optical holes, and both ends of the connector are provided with limiting portions, which are respectively connected to the corresponding optical holes; or,

[0027] One of the second and third connecting parts is configured as a light hole and is movably sleeved on one end of the connector, the end of the connector being provided with a limiting part; the other of the second and third connecting parts is configured as a welding position, the other end of the connector being welded to the welding position.

[0028] Furthermore, the connector is configured as a bolted connector with threads on only one end;

[0029] One of the second connecting part and the third connecting part is configured as a light hole and is movably sleeved on one end of the connector, and the end of the connector is configured with a limiting part; the other of the second connecting part and the third connecting part is configured as a threaded hole and is threadedly connected to the other end of the connector.

[0030] The support assembly also includes a spring, which is sleeved in the middle of the connector and abuts against the support block and the connector.

[0031] The beneficial effects of this invention are as follows:

[0032] 1) This handle tool can be connected to the vapor deposition machine cooling plate via its own bolt holes. Furthermore, when the handle tool is installed on the vapor deposition machine cooling plate, only a single bolt hole is required. The direction of the handle tool can be changed arbitrarily on the vapor deposition machine cooling plate according to actual needs, so that the operator can easily grasp the handle and apply force from different positions.

[0033] 2) This carrying tool has an adjustable support component. When there is a height difference such as a groove or a protrusion at the position where the carrying tool is installed on the cooling plate of the vapor deposition machine, the two support components can be adjusted to be suitable for support at different height positions.

[0034] 3) With the help of this handle tool, operators can carry and install the vapor deposition machine cooling plate without directly contacting it, effectively avoiding contamination of the cooling plate by hand. Furthermore, the bolts on the handle tool are firmly connected to the cooling plate, and the support components on both sides provide stable support, which greatly improves the reliability of the operator when carrying and installing the equipment, and reduces the risk of the handle tool detaching from the cooling plate.

[0035] Furthermore, other additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0036] Figure 1 An exploded view of a carrying tool as one of the embodiments;

[0037] Figure 2 An assembly diagram of a carrying handle tool as one of the embodiments;

[0038] Figure 3 This is an assembly diagram of the handle tool according to the second embodiment;

[0039] Figure 4 This is a schematic diagram illustrating the usage state of the handle tool according to the second implementation method.

[0040] Figure 5 This is an assembly diagram of the handle tool according to the third embodiment;

[0041] Figure 6 This is a partial structural cross-sectional view of the handle tool according to the third embodiment;

[0042] Figure 7This is a schematic diagram illustrating the usage state of the handle tool according to the third implementation method.

[0043] Figure 8 This is an assembly diagram of the handle tool according to the fourth embodiment;

[0044] Figure 9 This is a schematic diagram illustrating the usage status of the handle tool according to the fourth implementation method.

[0045] Figure 10 A schematic diagram of one embodiment for mounting a handle tool on a cooling plate;

[0046] Figure 11 for Figure 10 A magnified view of a portion of position A in the middle, where... Figure 11 (b) for in Figure 11 (a) is obtained by rotating the handle tool to its correct position.

[0047] In the diagram: 1. Handle; 11. Grip part; 12. External connection part; 2. Connector; 21. First connection part; 22. Second connection part; 3. Screw fastener;

[0048] 4. Bolt; 41. Fastening nut; 42. Rotating handle;

[0049] 5. Support assembly; 51. Support block; 511. Third connecting part; 52. Connector; 521. Limiting part; 53. Spring;

[0050] 6. Cooling plate. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. For reference, the following description and accompanying drawings are brief examples to help understand this invention, and are not intended to limit the technical scope of this invention. In other words, the embodiments described below may have various modifications, which fall within the scope of the technical concept of this invention. Those skilled in the art can easily understand the technical concept of this invention through the following description. The invention will be further described below with reference to the accompanying drawings and embodiments.

[0052] See appendix Figure 1 The image shows a handle tool for carrying a cooling plate of a vapor deposition machine. The handle tool includes a handle 1, a connector 2, a bolt 4 for external connection, and a support assembly 5.

[0053] The handle 1 has a generally straight gripping portion 11, and both ends or only one end of the gripping portion 11 has an external connecting portion 12. The external connecting portion 12 is connected to the connecting member 2 in a detachable or non-detachable manner, such as by welding or by screws. To facilitate the operator's application of force to move the cooling plate of the vapor deposition machine, the connecting member 2 is generally parallel to the gripping portion 11 of the handle 1. For example, Figure 1 In one example shown, the gripping part 11 has external connecting parts 12 at both ends, the connector 2 is elongated, the external connecting parts 12 at both ends of the gripping part 11 are bent toward the connector 2, and the external connecting parts 12 and the connector 2 are detachably connected by screw fasteners 3.

[0054] Bolt 4 is used to connect the target workpiece to be transported, specifically to the cooling plate of the vapor deposition machine. Considering that the handle tool only has one bolt 4 for connecting to the target workpiece, the stability of the connection between the handle tool and the target workpiece may be insufficient. Therefore, bolt 4 is positioned in the middle of the connector 2, so that the lifting force applied by the operator when gripping the handle 1 to lift the target workpiece is applied along the axial direction of bolt 4, rather than biased to one side of bolt 4. Simultaneously, two sets of support components 5 are provided on both sides of bolt 4, connected to the connector 2, supporting the target workpiece and the connector 2 to improve stability.

[0055] Specifically, see Appendix Figure 1 Example from the diagram. A first connecting portion 21 is disposed in the middle of the connector 2, and a second connecting portion 22 is disposed on each side of the first connecting portion 21. One end of the bolt 4 is connected to the first connecting portion 21, and the other end extends towards the side of the connector 2 away from the handle 1; this other end serves as the connection end for the target workpiece. The support assembly 5 includes a support block 51 and a connector 52. A third connecting portion 511 is disposed on the support block 51, and the connector 52 connects to the second connecting portion 22 and the third connecting portion 511. The support block 51 is preferably made of a flexible material, such as rubber or plastic, to avoid damaging the surface of the cooling plate when in contact with the vapor deposition machine's cooling plate.

[0056] See appendix Figure 10 and attached Figure 11 As shown, the aforementioned handle tool is used to move the cooling plate of the vapor deposition machine. It can be connected to the cooling plate via its own bolt holes. Furthermore, when the handle tool is installed on the cooling plate, only a single bolt hole is required, and the installation position is not limited by the number of bolt holes or the spacing between them. Based on the structural feature of using a single bolt 4 for connection, the direction of the handle tool can be arbitrarily changed on the cooling plate according to actual needs, allowing the operator to easily grasp the handle 1 and apply force from different positions. For example, when attaching the handle tool... Figure 11The orientation of the handle tool on the cooling plate 6 shown in (a) can be obtained by rotating the direction. Figure 11 The state shown in (b).

[0057] In the aforementioned carrying tool, bolt 4 and connector 2 can be configured for a fixed connection. For example, see... Figure 1 and Figure 2 As shown, the first connecting part 21 of the connector 2 is configured as a smooth hole. After the front end of the bolt 4 passes through the smooth hole, the bolt 4 is locked and fixed in the smooth hole by means of the fastening nut 41. Of course, the first connecting part 21 can also be configured as a welding position, and one end of the bolt 4 can be welded and fixed at the welding position; or, the first connecting part 21 can be configured as a smooth hole, and one end of the bolt 4 can be inserted into the smooth hole and interference fit with the smooth hole to achieve a fixed connection of the bolt 4 on the connector 2; or, the first connecting part 21 can be configured as a threaded hole, and the bolt 4 can be threaded into the threaded hole. In this case, a fastening nut 41 can also be added to the middle of the bolt 4 to provide secondary reinforcement of the bolt 4 and prevent it from loosening in the threaded hole.

[0058] Based on the fixed connection between bolt 4 and connector 2, the operator can directly screw bolt 4 on the handle tool into the bolt hole on the target workpiece by rotating handle 1, making the operation of installing the handle tool on the target workpiece more convenient and labor-saving.

[0059] Furthermore, the bolt 4 may not be fixed to the connector 2, meaning there is no rigid connection between them. For example, the first connecting portion 21 of the connector 2 may be configured as a through hole, with the bolt 4 inserted into the first connecting portion 21 from the side near the handle 1 and extending towards the other side of the connector 2 away from the handle 1. The bolt 4 is clearance-fitted with the through hole. That is to say, the bolt 4 can move freely relative to the connector 2 in its extending direction, and the bolt 4 can also rotate freely in its circumferential direction.

[0060] If bolt 4 is not fixed to connector 2, it is necessary to directly rotate bolt 4 to screw it into the bolt hole on the target workpiece. Therefore, for ease of operation, please refer to the appendix. Figure 5 As shown, a rotating handle 42 is provided on the bolt 4, located at the end of the bolt 4 near the handle 1. The addition of the rotating handle 42 facilitates the operator's application of force to rotate the bolt 4. Considering that the bolt 4 may detach from the connector 2, requiring temporary reassembly, a restraining element, such as a nut, can be provided on the bolt 4. This nut is positioned on the side of the connector 2 away from the rotating handle 42, thereby restricting the bolt 4's free movement relative to the connector 2 in its extending direction, allowing it to rotate freely only in its circumferential direction, thus preventing the bolt 4 from detaching from the connector 2.

[0061] In the aforementioned carrying tool, the support component 5 can be configured such that the relative distance between the support block 51 and the connecting piece 2 is fixed. For example, see Appendix Figure 1 and attached Figure 2 In the example shown, connector 52 is configured as a countersunk screw, the second connecting portion 22 on connector 2 is configured as a threaded hole, and the third connecting portion 511 on support block 51 is configured as a through hole with a countersunk step. The countersunk screw is inserted from the side away from connector 2, passes through the through hole on support block 51, and is then threaded onto the aforementioned threaded hole on connector 2, thereby fixing support block 51 to connector 2. Alternatively, connector 52 can be configured to be non-detachably connected to either support block 51 or connector 2. For example, connector 52 can be configured as a rod, with the second connecting portion 22 and the third connecting portion 511 configured as welded positions, and both ends of the rod welded to support block 51 and connector 2, respectively.

[0062] In practice, some handle mounting positions on the cooling plate of the vapor deposition machine have grooves or protrusions, resulting in high and low surfaces at these mounting positions. When the two support blocks 51 on the handle fall on the high and low surface areas respectively, only one support block 51 can contact the surface of the vapor deposition machine cooling plate. This situation can cause the support assembly 5 on one side to fail. During handling, the force of pulling the handle 1 may be biased towards the failed side, causing the bolt 4 to bend.

[0063] To solve the above problems, in this handle tool, the connector 52 is movably connected to at least one of the connector 2 and the support block 51, so that the support block 51 can move closer to or further away from the connector 2 along the connector 52.

[0064] One embodiment is as follows: the connector 52 is configured as a bolt connector with a thread on only one end; one of the second connecting part 22 on the connector 2 and the third connecting part 511 on the support block 51 is configured as a threaded hole and is threadedly connected to the threaded end of the connector 52; the other of the second connecting part 22 and the third connecting part 511 is configured as a smooth hole or a welding position, and is fixedly connected to the other end of the connector 52 by interference fit or welded to each other.

[0065] For example, see Appendix Figure 3 As shown, the connector 52 is configured as a bolted connector, and the end of the bolted connector that connects to the support block 51 has a thread; the second connecting portion 22 on the connector 2 is configured as a smooth hole; and the third connecting portion 511 on the support block 51 is configured as a threaded hole. The threaded end of the connector 52 is threaded into the threaded hole on the support block 51, and the other end is embedded in the smooth hole on the connector 2, with both having an interference fit.

[0066] See appendix Figure 4As shown, when using this handle tool, when support block 51-a and support block 51-b are located on the high surface and low surface area of ​​the vapor deposition machine cooling plate, respectively, support block 51-a will first contact and abut against the high surface. At this time, support block 51-b can be rotated separately to move down along the connector 52 and abut against the low surface, so that both support blocks 51 abut against the surface of the vapor deposition machine cooling plate.

[0067] Different from the above implementation, the following implementation can also be adopted. The connector 52 is configured as a bolted connector with threads at both ends. The second connecting portion 22 on the connecting member 2 and the third connecting portion 511 on the support block 51 are both configured with matching threaded holes. The two ends of the connector 52 are threadedly connected to the second connecting portion 22 and the third connecting portion 511, respectively. This structure also allows for individual adjustment of one of the support blocks 51 when needed, so that the two support blocks 51 are at different heights and both abut against the surface of the vapor deposition machine's cooling plate. However, in practice, adjusting the rotating support block 51 may cause both ends of the connector 52 to loosen, complicating the operation. Therefore, preferably, the thread fit clearance between the connector 52 and the third connecting portion 511 is different from the thread fit clearance between the connector 52 and the second connecting portion 22; that is, the former's fit clearance is greater than the latter's fit clearance, or the former's fit clearance is smaller than the latter's fit clearance. In this way, the connection at one end of the connector 52 is easier to rotate than the connection at the other end, and rotating the support block 51 is less likely to cause both ends of the connector 52 to loosen.

[0068] Another implementation is as follows: The connector 52 is configured as a rod; the support assembly 5 also includes a spring 53, which is sleeved in the middle of the connector 52 and abuts against the support block 51 and the connector 2. In this case, there are two options: First, the second connecting portion 22 on the connector 2 and the third connecting portion 511 on the support block 51 are both configured as through holes, preferably through holes with countersunk steps. Both ends of the connector 52 are provided with limiting portions 521, which are respectively connected to the corresponding through holes. Second, one of the second connecting portion 22 and the third connecting portion 511 is configured as the aforementioned through hole, movably sleeved on one end of the connector 52, and the limiting portion 521 is provided at that end of the connector 52; the other of the second connecting portion 22 and the third connecting portion 511 is configured as a welding position, and the other end of the connector 52 is welded to this welding position. This achieves a floating connection structure between the support block 51 and the connector 2.

[0069] For example, see Appendix Figure 5 and attached Figure 6As shown, the second connecting part 22 on the connector 2 is a welding position; the third connecting part 511 on the support block 51 is a light hole and is a through hole with a countersunk step; the connector 52 is a rod, one end of which is welded to the welding position on the connector 2, and the other end is accommodated in the light hole on the support block 51. Furthermore, the other end of the rod has a limiting part 521 for limiting the rod in the support block 51 so that it does not detach.

[0070] See appendix Figure 7 As shown, when using this carrying tool, the bolt 4 is screwed into the threaded hole on the cooling plate 6 by manually rotating the rotating handle 42 on the bolt 4. When the support block 51-a and the support block 51-b are respectively located on the high surface and low surface area of ​​the vapor deposition machine cooling plate, the support block 51-a first contacts and abuts the high surface. Since the support block 51 and the connecting piece 2 are connected by the above-mentioned floating structure, the bolt 4 can be rotated until the support block 51-b stably abuts the low surface. Thus, both support blocks 51 abut against the surface of the vapor deposition machine cooling plate.

[0071] Another implementation is as follows: The connector 52 is configured as a bolted connector with threads on only one end; one of the second connecting portion 22 on the connector 2 and the third connecting portion 511 on the support block 51 is configured as a smooth hole and is movably sleeved on one end of the connector 52, and the end of the connector 52 is configured with a limiting portion 521; the other of the second connecting portion 22 and the third connecting portion 511 is configured as a threaded hole and is threadedly connected to the other end of the connector 52; the support assembly 5 also includes a spring 53, which is sleeved on the middle of the connector 52 and abuts against the support block 51 and the connector 2.

[0072] For example, see Appendix Figure 8 As shown, connector 52 is a bolt connector with a threaded end and a limiting part 521 (i.e., bolt head) at the other end; the second connecting part 22 on connector 2 is a smooth hole; and the third connecting part 511 on support block 51 is a threaded hole. The bolt connector is inserted into and passes through the smooth hole on connector 2 with a clearance fit, and then the threaded end of the bolt connector is threaded into the threaded hole on support block 51. A spring 53 is sleeved in the middle of the bolt connector, and the spring 53 abuts against the support block 51 and connector 2.

[0073] See appendix Figure 9 As shown, when using this carrying tool, the bolt 4 is screwed into the threaded hole on the cooling plate 6 by manually rotating the rotating handle 42 on the bolt 4. When the support block 51-a and the support block 51-b are respectively located on the high surface and low surface area of ​​the evaporation machine cooling plate, the bolt 4 is continuously rotated until the support block 51-a and the support block 51-b both abut against the surface of the evaporation machine cooling plate.

[0074] Finally, it should be emphasized again that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention and not to limit them. Although the embodiments of the present invention have been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the embodiments of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A handle tool for carrying an evaporation machine cooling plate, characterized by, The handle (1) comprises: a connecting piece (2) connected with the handle (1), a first connecting part (21) is arranged in the middle of the connecting piece (2), and a second connecting part (22) is arranged on both sides of the first connecting part (21); and a bolt (4) for external connection, the bolt (4) is arranged in the middle of the connecting piece (2), one end of the bolt (4) is connected with the first connecting part (21), and the other end of the bolt (4) extends to the side of the connecting piece (2) away from the handle (1); and a support assembly (5) connected with the connecting piece (2), two groups of support assemblies (5) are arranged on both sides of the bolt (4), the support assembly (5) comprises a support block (51) and a connecting piece (52), the support block (51) is provided with a third connecting part (511), and the connecting piece (52) is connected with the second connecting part (22) and the third connecting part (511), wherein the connecting piece (52) is movably connected with one of the connecting piece (2) and the support block (51), and the support block (51) can move towards or away from the connecting piece (2) along the connecting piece (52), the support blocks (51) of the two groups of support assemblies (5) are at different heights by moving towards or away from the connecting piece (2) along the connecting piece (52), so that the two support blocks (51) are adapted to abut against high-position surfaces and low-position surfaces with height difference between each other respectively. The first connecting part (21) is arranged as a welding position or a light hole or a threaded hole, and the bolt (4) is fixedly connected with the first connecting part (21). The first connecting part (21) is a light hole, the bolt (4) is inserted into the first connecting part (21) from the side close to the handle (1) and extends to the other side of the connecting piece (2) away from the handle (1); 2. The handle tool for carrying an evaporator cooling plate according to claim 1, wherein a rotating handle (42) is arranged on the bolt (4), and the rotating handle (42) is located at one end of the bolt (4) close to the handle (1).

3. The handle tool for carrying an evaporator cooling plate according to claim 1, wherein The connecting piece (52) is arranged as a bolt connecting piece with threads at only one end; one of the second connecting part (22) and the third connecting part (511) is arranged as a threaded hole and is threadedly connected with the connecting piece (52) having threads at one end; 4. The handle tool for carrying an evaporator cooling plate according to claim 1 or 3, wherein the other one of the second connecting part (22) and the third connecting part (511) is arranged as a light hole or a welding position and is interference-fitted with the other end of the connecting piece (52) or welded with each other. The connecting piece (52) is arranged as a bolt connecting piece with threads at both ends; The second connecting part (22) and the third connecting part (511) are both arranged as threaded holes; 5. The handle tool for carrying an evaporator cooling plate according to claim 1 or 3, wherein the two ends of the connecting piece (52) are threadedly connected with the second connecting part (22) and the third connecting part (511) respectively; and the thread cooperation gap between the connecting piece (52) and the third connecting part (511) and the thread cooperation gap between the connecting piece (52) and the second connecting part (22) are different.

6. The handle tool for carrying the evaporation machine cooling plate according to claim 1 or 3, wherein the connecting piece (52) is arranged as a rod; ​ ​ The support assembly (5) further comprises a spring (53) sleeved on the middle part of the connecting piece (52) and pressed between the support block (51) and the connecting piece (2); and The second connecting part (22) and the third connecting part (511) are both configured as light holes, both ends of the connecting piece (52) are configured as limiting parts (521) and are connected in the corresponding light holes respectively; or, One of the second connecting part (22) and the third connecting part (511) is configured as a light hole and movably sleeved on one end of the connecting piece (52), and the other end of the connecting piece (52) is configured as a limiting part (521); the other of the second connecting part (22) and the third connecting part (511) is configured as a welding position and welded with the other end of the connecting piece (52).

7. The handle tool for carrying an evaporator cooling plate according to claim 1 or 3, wherein The connecting piece (52) is configured as a bolt connecting piece with only one end having a thread; One of the second connecting part (22) and the third connecting part (511) is configured as a light hole and movably sleeved on one end of the connecting piece (52), and the other end of the connecting piece (52) is configured as a limiting part (521); the other of the second connecting part (22) and the third connecting part (511) is configured as a threaded hole and screwed with the other end of the connecting piece (52). The support assembly (5) further comprises a spring (53) sleeved on the middle part of the connecting piece (52) and abutting between the support block (51) and the connecting piece (2).

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