CN215318156U - Fastening structure - Google Patents

Abstract

A fastening structure comprises a fixing piece, a first moving piece, a clamping component and a second moving piece. The fixing piece comprises a fixing part and a connecting part; the first movable piece comprises a pressure head and a fixed ring, the pressure head is movably connected with the connecting part, and the fixed ring comprises a first accommodating groove; the clamping assembly comprises an elastic piece, a clamping piece and a jackscrew, the elastic piece and the jackscrew are accommodated in the first accommodating groove, one end of the elastic piece is connected with the jackscrew, the other end of the elastic piece is connected with the clamping piece, the jackscrew is movably connected with the fixing ring, and the clamping piece can be partially or completely accommodated in the first accommodating groove; the second moving part is rotatably sleeved on the fixing ring, an opening is formed in the surface, connected with the fixing ring, of the second moving part, and the clamping piece can be partially accommodated in the opening; when the external force applied to the second moving part is smaller than the elastic force of the elastic piece to the clamping piece, the clamping piece clamps the second moving part; when the external force acting on the second movable piece is larger than the elastic force of the elastic piece to the clamping piece, the clamping piece is completely accommodated in the first accommodating groove.

Description

Fastening structure

Technical Field

The application relates to the tool field, especially relates to a fastening structure.

Background

In Surface Mount Technology (SMT) processes, a carrier is generally used to position and support an object to be clamped (e.g., a circuit board), a clamp is used to position the object to be clamped on a Surface of the object to be clamped away from the carrier to perform a process (e.g., a reflow process) on the object to be clamped, and a fastening structure is used to fasten the carrier and the clamp to ensure the flatness of the object to be clamped. After long-time use, the fastening structure is abraded, so that the fastening clamping force is changed, and the smoothness of an object to be clamped cannot be guaranteed.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is desirable to provide a fastening structure capable of adjusting the clamping force.

A fastening structure comprises a fixing piece, a first moving piece, a clamping component and a second moving piece. The fixing piece comprises a fixing part and a connecting part, and the connecting part is connected with the fixing part; the first movable piece comprises a pressure head and a fixed ring, the fixed ring is connected with the pressure head, the pressure head is movably connected with the connecting part, and the fixed ring comprises a first accommodating groove; the clamping assembly comprises an elastic piece, a clamping piece and a jackscrew, the elastic piece and the jackscrew are accommodated in the first accommodating groove, one end of the elastic piece is connected with the jackscrew, the other end of the elastic piece is connected with the clamping piece, the jackscrew is movably connected with the fixing ring, and the clamping piece can be partially or completely accommodated in the first accommodating groove; the second movable piece is rotatably sleeved on the fixing ring, an opening is formed in the surface, connected with the fixing ring, of the second movable piece, and the clamping piece can be partially accommodated in the opening; when the external force acting on the second moving part is smaller than the elastic force of the elastic piece to the clamping piece, the clamping piece clamps the second moving part; when the external force acting on the second movable piece is larger than the elastic force of the elastic piece to the clamping piece, the clamping piece is completely accommodated in the first accommodating groove.

In some embodiments, the retaining member further includes a sleeve, the sleeve is hollow inside and is located in the first accommodating groove, the elastic member and the jackscrew are located in the sleeve, and the retaining member can be accommodated in the sleeve according to the compression amount of the elastic member and the acting force acting on the retaining member.

In some embodiments, the sleeve further includes a protrusion located at an end of the elastic member away from the jackscrew, the protrusion protrudes from an inner wall of the sleeve, and the protrusion and the jackscrew respectively abut against two ends of the elastic member.

In some embodiments, the jackscrew is threadedly connected to the sleeve.

In some embodiments, the outer surface of the connecting portion has a first thread and the interior of the ram has a second thread that engages the first thread.

In some embodiments, the surface of the catch member abutting the second movable member is an arcuate surface.

In some embodiments, the catch is a ball.

In some embodiments, the second movable member has a second receiving groove, the second receiving groove is adapted to the fixing ring, and the second receiving groove is used for receiving the fixing ring.

In some embodiments, at least two points of the inner wall forming the opening have a distance smaller than a distance between two points of the outer wall of the retaining member in a plane passing through a compression direction of the elastic member, so that the retaining member abuts against the second movable member when the first accommodating groove is communicated with the opening.

In some embodiments, the resilient member is a spring.

The application provides a fastening structure, can be through the size of the elasticity that the control elastic component received, the control is exerted in external force on the second moving part to control pressure head and fixed part act on the effort on carrier and anchor clamps. After the fastening structure is used for multiple times, the compression amount of the elastic piece is adjusted by adjusting the position of the jackscrew, so that the elasticity of the elastic piece is adjusted to ensure the clamping force of the fastening structure.

Drawings

Fig. 1 is a schematic structural view of a fastening structure clamping carrier and a clamp according to an embodiment of the present disclosure.

Fig. 2 is a schematic structural diagram of a fastening structure provided in an embodiment of the present application.

Fig. 3 is an exploded view of the fastening structure shown in fig. 2.

Fig. 4 is a schematic cross-sectional view of the fastening arrangement shown in fig. 2, taken along the direction IV-IV.

FIG. 5 is a cross-sectional view of the fastening structure holding the carrier and the clamp in an initial state.

Figure 6 is a schematic cross-sectional view of the indenter shown in figure 5 in contact with the clamp.

FIG. 7 is a schematic cross-sectional view of the second movable member of FIG. 6 after idle rotation as compared to the first movable member.

Description of the main elements

The following detailed description will further illustrate the present application in conjunction with the above-described figures.

Detailed Description

In order that the above objects, features and advantages of the present application can be more clearly understood, a detailed description of the present application will be given below with reference to the accompanying drawings and detailed description. In addition, the embodiments and features of the embodiments of the present application may be combined with each other without conflict. In the following description, numerous specific details are set forth to provide a thorough understanding of the present application, and the described embodiments are merely a subset of the embodiments of the present application, rather than all embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes all and any combination of one or more of the associated listed items.

In various embodiments of the present application, for convenience in description and not limitation, the term "coupled" as used in the specification and claims of the present application is not limited to physical or mechanical connections, either direct or indirect. "upper", "lower", "above", "below", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.

Referring to fig. 1, an embodiment of the present application provides an automatically adjustable fastening structure 100 for fastening a carrier 200 and a clamp 300. An object to be clamped (not shown) including, but not limited to, a circuit board may be disposed between the carrier 200 and the clamp 300. The number of the fastening structures 100 may be one or more, and in the present embodiment, the number of the fastening structures 100 is four, and the fastening structures are respectively located at four corner regions of the carrier 200 or the clamp 300.

Referring to fig. 2, the fastening structure 100 includes a fixed member 10, a first movable member 20, a retaining member 30, and a second movable member 40. The first movable member 20 is movably connected to the fixed member 10, the retaining member 30 is fixedly connected to the first movable member 20, and the second movable member 40 is rotatably connected to the retaining member 30. The clamping component 30 can clamp the second movable member 40 to enable the second movable member 40 and the first movable member 20 to move synchronously; the retaining assembly 30 can also be completely received in the first movable member 20 such that the second movable member 40 is movably connected to the first movable member 20.

Referring to fig. 3 and 4, the fixing element 10 includes a fixing portion 12 and a connecting portion 14, wherein the fixing portion 12 is located at one end of the connecting portion 14 and is fixedly connected to the connecting portion 14. In some embodiments, the fixing portion 12 and the connecting portion 14 may be of a unitary structure so as to be fixedly connected. In other embodiments, the fixing member 10 further includes a fastener 16 (e.g., a pin, not shown), and the fastener 16 connects the fixing portion 12 and the connecting portion 14, so that the connecting portion 14 is inserted into the carrier 200 and the fixture 300.

The outer surface of the connecting portion 14 has a first thread 142.

The first movable member 20 includes a pressing head 22 and a fixed ring 24, and the pressing head 22 is located on one side of the fixed ring 24 and is fixedly connected with the fixed ring 24. The ram 22 is hollow, and the ram 22 has second threads 222 therein, wherein the second threads 222 engage with the first threads 142 to movably couple the first movable member 20 to the stationary member 10. The connecting portion 14 can be inserted into the carrier 200 and the fixture 300, the fixing portion 12 is located on a surface of the carrier 200, the ram 22 is located on a surface of the fixture 300 facing away from the carrier 200, and the first movable member 20 is rotated to reduce a distance between the ram 22 and the fixing portion 12, so as to fasten the carrier 200 and the fixture 300.

The shape of the fixing ring 24 is cylindrical, a first receiving groove 242 is formed inside the fixing ring 24, the first receiving groove 242 is recessed in one surface of the fixing ring 24, and the first receiving groove 242 may be a groove or a through hole. The first receiving groove 242 is used for receiving the retaining assembly 30.

The holding assembly 30 includes an elastic member 32, a holding member 34 and a top wire 38, the elastic member 32 is connected to the top wire 38 and the holding member 34, and the elastic member 32 and the top wire 38 are both located in the first receiving groove 242. The elastic member 32 is deformed when receiving an acting force and is restored to its original shape when losing the acting force. In some embodiments, the resilient member 32 may be a spring. The jackscrew 38 is movably connected to the fixing ring 24, for example, a thread adapted to the fixing ring 24 is provided, and after the fastening structure 100 is used for a plurality of times, the position of the jackscrew 38 in the sleeve 36 is adjusted, so that the compression amount of the elastic member 32 can be adjusted, and the elastic force of the elastic member 32 can be adjusted, thereby ensuring the clamping force of the fastening structure 100.

The retaining member 34 can be partially or completely received in the first receiving slot 242 and abut against the second movable member 40, and an external force can be applied to the second movable member 40, so as to act on the retaining member 34. When the retainer 34 does not act on the elastic member 32, the retainer 34 can be partially received in the first receiving groove 242; when the retaining member 34 acts on the elastic member 32, the elastic member 32 can be gradually compressed by the retaining member 34, and the retaining member 34 is gradually and continuously accommodated in the first accommodating groove 242 until the retaining member 34 is completely accommodated in the first accommodating groove 242.

The surface of the clamping member 34 abutting against the second movable member 40 is an arc surface, so that when an external force is applied to the second movable member 40, the acting force acting on the second movable member 40 is flexibly transited, and the second movable member 40 is prevented from being damaged after being used for many times due to hard contact. In this embodiment, the retainer 34 is a ball.

In some embodiments, the retaining assembly 30 may further include a sleeve 36, the sleeve 36 is hollow inside, the sleeve 36 is located in the first receiving groove 242, the elastic member 32 and the top wire 38 are located in the sleeve 36, and the top wire 38 and the sleeve 36 are provided with matching threads; the retainer 34 may be received in the sleeve 36 according to the amount of compression of the elastic member 32 and the magnitude of the force acting on the retainer 34.

In some embodiments, the sleeve 36 further includes a protrusion 362 (see fig. 4), the protrusion 362 is located at an end of the elastic member 32 facing away from the terminal wire 38, the protrusion 362 protrudes from an inner wall of the sleeve 36, and the protrusion 362 and the terminal wire 38 respectively abut against two ends of the elastic member 32, which is further beneficial for the terminal wire 38 to adjust the compression amount of the elastic member 32.

The second movable member 40 is a swivel ring, and the second movable member 40 is hollow inside. The second movable member 40 has a second receiving groove 42, the shape of the second receiving groove 42 is matched with the shape of the fixing ring 24, the second receiving groove 42 is cylindrical, and the second receiving groove 42 is used for receiving the fixing ring 24.

The surface of the second movable member 40 facing the fixed ring 24 has an opening 45, the opening 45 may be a through hole or a groove, and the opening 45 is communicated with the second receiving groove 42. When the fixing ring 24 is accommodated in the second movable member 40, the first accommodating groove 242 is flush with the opening 45, that is, the first accommodating groove 242 is communicated with the opening 45.

When no external force is applied to the retainer 34, a portion of the retainer 34 is located in the first receiving groove 242, and another portion of the retainer 34 is received in the opening 45.

In a plane passing through the compression direction of the elastic member 32, the distance between at least two points on the inner wall forming the opening 45 is smaller than the distance between two points on the outer wall of the retaining member 34, so that when the first containing groove 242 is communicated with the opening 45, the retaining member 34 abuts against the second movable member 40.

When an external force is applied to the second movable member 40, the external force applied to the second movable member 40 is defined as F1, and the elastic force of the elastic member 32 on the retaining member 34 is defined as F2. When the external force is smaller than the elastic force, that is, F1 < F2, the second movable member 40 and the first movable member 20 are clamped with each other, the second movable member 40 and the first movable member 20 do not move relatively, that is, the second movable member 40 rotates, the first movable member 20 and the second movable member 40 rotate simultaneously, so as to drive the pressing head 22 to move until the pressing head abuts against the clamp 300, at this time, the carrier 200 and the clamp 300 generate a resistance force acting on the pressing head 22, and the resistance force gradually increases as the external force acting on the second movable member 40 gradually increases.

When the resistance is large enough, the external force also increases until the external force is equal to the elastic force, i.e., F1 ═ F2, the elastic member 32 is at the critical point of compression.

When the external force is larger than the elastic force, that is, F1 is greater than F2, the elastic member 32 is compressed, and after the retaining member 34 is gradually and completely accommodated in the second accommodating groove 42, the second movable member 40 generates displacement compared with the first movable member 20, and at this time, it is equivalent to that the second movable member 40 idles compared with the first movable member 20.

The fastening structure 100 may further include a gasket (not shown), the gasket is sleeved on the connecting portion 14 and located between the fixing portion 12 and the pressing head 22, and the gasket can increase a contact area of the pressing head 22 acting on the fixture 300, reduce a pressure, and prevent the fixture 300 from being damaged due to an excessive pressure during use of the fastening structure 100.

In order to more clearly illustrate the connection relationship between the components of the present embodiment, the following describes in detail the process of fastening the carrier 200 and the clamp 300 by the fastening structure 100 provided in the present embodiment.

Referring to fig. 5, in an initial state, the carrier 200 and the fixture 300 are stacked, a circuit board is disposed between the carrier 200 and the fixture 300, the carrier 200 and the fixture 300 are disposed on the fixing portion 12 and penetrate the connecting portion 14, and the pressing head 22 is located on a side of the fixture 300 away from the fixing portion 12. At this time, the retaining member 34 is partially received in the second receiving groove 42 of the fixing ring 24, and the other portion is received in the opening 45 of the second movable member 40, and the retaining member 34 abuts against one end of the elastic member 32.

Referring to fig. 6, when the second movable member 40 is rotated, the second movable member 40 drives the first movable member 20 to rotate, and the pressing head 22 moves toward the fixed portion 12 under the mutual cooperation between the second thread 222 and the first thread 142, so as to gradually shorten the distance between the pressing head 22 and the fixed portion 12, and when the pressing head 22 and the clamp 300 contact each other, the clamp 300 generates resistance to the pressing head 22; when the external force acting on the second movable member 40 is continuously applied, the resistance gradually increases, and the external force also gradually increases until the external force is equal to the elastic force of the elastic member 32, and the elastic member 32 is at the critical point of being compressed.

Referring to fig. 7, when the external force is greater than the elastic force of the elastic member 32, the retaining member 34 compresses the elastic member 32, the retaining member 34 is gradually accommodated in the second accommodating groove 42 until the retaining member 34 is completely accommodated in the second accommodating groove 42, the second movable member 40 generates displacement compared to the first movable member 20, and when the external force is continuously increased to the second movable member 40, the second movable member 40 idles compared to the first movable member 20. At this point, the distance between the ram 22 and the stationary portion 12 no longer continues to decrease, and the carrier 200 and the clamp 300 are tightened.

The fastening structure 100 provided by the present application can control the external force applied to the second movable member 40 by controlling the magnitude of the elastic force applied to the elastic member 32, so as to control the acting force of the pressing head 22 and the fixing portion 12 on the carrier 200 and the clamp 300. After the fastening structure 100 is used for multiple times, the position of the jackscrew 38 is adjusted, so that the compression amount of the elastic element 32 is adjusted, and the elastic force of the elastic element 32 is adjusted, so that the clamping force of the fastening structure 100 is ensured.

Although the present application has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the present application.

Claims (10)

1. A fastening structure, comprising:

the fixing piece comprises a fixing part and a connecting part, and the connecting part is connected with the fixing part;

the first movable piece comprises a pressure head and a fixed ring, the fixed ring is connected with the pressure head, the pressure head is movably connected with the connecting part, and the fixed ring comprises a first accommodating groove;

the clamping assembly comprises an elastic piece, a clamping piece and a jackscrew, the elastic piece and the jackscrew are accommodated in the first accommodating groove, one end of the elastic piece is connected with the jackscrew, the other end of the elastic piece is connected with the clamping piece, the jackscrew is movably connected with the fixing ring, and the clamping piece can be partially or completely accommodated in the first accommodating groove; and

the second movable piece is rotatably sleeved on the fixing ring, an opening is formed in the surface, connected with the fixing ring, of the second movable piece, and the clamping piece can be partially accommodated in the opening;

when the external force acting on the second moving part is smaller than the elastic force of the elastic piece to the clamping piece, the clamping piece clamps the second moving part; when the external force acting on the second movable piece is larger than the elastic force of the elastic piece to the clamping piece, the clamping piece is completely accommodated in the first accommodating groove.

2. The fastening structure according to claim 1, wherein the retaining member further comprises a sleeve, the sleeve is hollow inside, the sleeve is located in the first accommodating groove, the elastic member and the jackscrew are located in the sleeve, and the retaining member can be accommodated in the sleeve according to the compression amount of the elastic member and the magnitude of the acting force acting on the retaining member.

3. The fastening structure according to claim 2, wherein the sleeve further comprises a protrusion, the protrusion is located at one end of the elastic member facing away from the jackscrew, the protrusion protrudes from an inner wall of the sleeve, and the protrusion and the jackscrew respectively abut against two ends of the elastic member.

4. The fastening structure according to claim 2, wherein the jackscrew is threadedly connected to the sleeve.

5. The fastening structure according to claim 1, wherein an outer surface of the connecting portion has a first thread, and the inside of the ram has a second thread engaged with the first thread.

6. The fastening structure according to claim 1, wherein a surface of the retaining member abutting the second movable member is an arc surface.

7. The fastening structure of claim 6, wherein the catch is a ball.

8. The fastening structure according to claim 1, wherein the second movable member has a second receiving groove, the second receiving groove is adapted to the fixing ring, and the second receiving groove is configured to receive the fixing ring.

9. The fastening structure according to claim 1, wherein a distance between at least two points on an inner wall forming the opening in a plane passing through a compression direction of the elastic member is smaller than a distance between two points on an outer wall of the retaining member, so that the retaining member abuts against the second movable member when the first receiving groove communicates with the opening.

10. The fastening structure according to claim 1, wherein the elastic member is a spring.

Images