Looseness screw turning and riveting device
By designing a loose screw rivet device driven by a servo electronic crimping machine, the problems of unstable rivet and manual tapping force in the prior art are solved, and the quality stability and consistency of loose screw rivet and good consistency are achieved.
Patent Information
- Application Number
- CN202421478184.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-26
- Publication Date
- 2025-04-08
- Estimated Expiration
- 2034-06-26
AI Technical Summary
The prior art has problems of inclination, suspension, loosening, deformation and thread damage when the screws are loosened, and the manual tapping force cannot be grasped and uniform.
A loose screw rivet device is designed, using a servo electronic crimping machine and a movable punch. The punch and the cushion column are processed and installed with the same standard to ensure that the punch is concentric with the loose screw rivet, and the pressure is adjusted through the servo electronic crimping machine to ensure a vertical and uniform riveting process.
The quality stability and consistency of the screws without loosening are achieved, and the rivets are avoided, tilting, hanging, loosening, deformation and thread damage are improved, and the efficiency and simplicity of operation are improved.
Smart Images
Figure CN222725394U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of riveting devices, in particular to a riveting device for loose and captive screws. Background Art
[0002] Captive screws are riveted to the mounting plate by flipping, and are suitable for various structures such as mounting parts in narrow spaces, plug-in panels, chassis panels, etc. At present, the industry usually adopts manual knocking to perform flip riveting. The main method is: use a pad to pad the front of the mounting plate, so that the rivet of the captive screw passes through the flip rivet hole of the mounting plate, and the spring of the captive screw shrinks due to the gravity of the mounting plate. Visually observe that the limit step of the rivet of the captive screw is close to the front of the mounting plate and remains vertical. Use one hand to use the head of the punch to vertically press against the flip rivet end of the captive screw riveted part, and use the other hand to take a hammer to hit the tail of the punch several times until the flip rivet end of the captive screw riveted part is flipped open at a 90° angle and close to the flip rivet countersunk hole surface of the mounting plate. This assembly method mainly has the following three problems: 1) The height of the captive screw rivet is affected by its own processing accuracy and spring contraction. When riveting, it is impossible to ensure that the limit step of the captive screw rivet is close to the front of the mounting plate and remains vertical, which may easily cause the captive screw to tilt or hang in the air; 2) The manual knocking force cannot be guaranteed to be vertically downward and the force cannot be controlled and is uneven, which may easily cause the captive screw to be not loosened enough or deformed due to excessive pressure; 3) When knocking manually, it is impossible to ensure that the punch is concentric with the captive screw, which may easily cause damage to the thread of the captive screw. Utility Model Content
[0003] In order to solve the above problems existing in the prior art, the purpose of the utility model is to provide a captive screw riveting device, which replaces the manual knocking method for riveting and completely solves the problems of captive screws tilting, hanging, loosening, deformation and screw thread damage.
[0004] The technical solution adopted by the utility model is:
[0005] A captive screw riveting device comprises a die frame, a pad column is connected to the die frame, the captive screw is placed in the pad column, a mounting plate is arranged on the pad column, a riveting countersunk hole is arranged on the mounting plate, the upper part of the captive screw is sleeved in the riveting countersunk hole, and a movable punch is sleeved on the die frame; a center hole is arranged at the lower end of the punch, the captive screw comprises a riveting piece and a center column sleeved in the riveting piece, and the center column and the center hole are concentric.
[0006] The mounting hole of the punch on the mold frame of the utility model is concentric with the mounting hole of the pad column. The captive screw is placed in the pad column hole, and the punch is concentric with the riveted part of the captive screw. The flip-riveted countersunk hole of the mounting plate is sleeved on the riveted part of the captive screw and placed on the support block. After the punch moves downward, it abuts against the riveted part of the captive screw. The servo electronic crimping machine pressure head is controlled to move downward to drive the punch to press down, so that the riveted part of the captive screw is flipped open and pressed against the surface of the flip-riveted countersunk hole of the mounting plate.
[0007] The utility model adopts the same processing and installation basis for the punch and the pad column, which solves the problem that the punch and the captive screw riveted parts are not concentric and vertical when manually knocked. The device adopts a servo electronic crimping machine for riveting, and the pressure is adjustable and linear, which solves the problem that the manual knocking force cannot be controlled and is uneven. The invention achieves the effect of stable quality and good consistency of riveting captive screws. The device has high riveting efficiency and simple operation.
[0008] As a preferred solution of the utility model, the support column is provided with a support block, and the mounting plate is arranged on the support block. The support block can support the mounting plate to ensure the stability of the mounting plate. The support block is sleeved on the support column to ensure the stability of the support block position, thereby ensuring the stability of the mounting plate position on the support block.
[0009] As a preferred solution of the utility model, a rubber pad is further arranged between the mounting plate and the pad column. The utility model adopts the rubber pad to solve the problem that the height of the riveted part of the captive screw is affected by its own processing accuracy and spring contraction.
[0010] As a preferred solution of the utility model, the shape of the rivet countersink is trumpet-shaped, the shape of the lower end of the punch is truncated cone-shaped, and the cone angle of the rivet countersink is equal to the cone angle of the lower end of the punch. When the punch is pressed down, the truncated cone-shaped part of the lower end of the punch can open the riveted part until it contacts the trumpet-shaped rivet countersink, thereby achieving reliable rivet.
[0011] As a preferred solution of the utility model, a clamping mechanism is connected between the punch and the die frame for pressing the lower end of the pad column against the captive screw. The punch is pressed against the riveted part of the captive screw by the tension of the clamping mechanism for pre-positioning, ensuring that the center hole of the punch can be reliably matched with the center column.
[0012] As a preferred solution of the utility model, the tightening mechanism includes a first connecting member, the first connecting member is fixed to the punch, a second connecting member is fixed to the die frame, the second connecting member is located at the lower side of the first connecting member, and a tension spring is connected between the first connecting member and the second connecting member. When the first connecting member on the punch is pulled downward, the punch is pressed downward by the tension of the tension spring and presses against the riveted part of the captive screw, thereby ensuring the stable position of the punch during punching.
[0013] As a preferred solution of the utility model, the die frame is connected with a locking mechanism for positioning the punch. When the locking mechanism locks the punch, the punch is separated from the pad column by a certain distance, which is convenient for placing a captive screw in the mounting hole of the pad column.
[0014] As a preferred solution of the utility model, the locking mechanism includes a locking pin, a through hole is provided on the die frame, the through hole is connected to the mounting hole of the punch, the locking pin is sleeved in the through hole, a groove is provided on the side of the punch, one end of the locking pin is engaged with the groove, a locking column is connected to the die frame, and a compression spring is pressed between the locking column and the locking pin. The compression spring pushes the locking pin toward the direction of the punch, and the locking pin is engaged with the groove of the punch, so that the punch can be positioned at a determined position.
[0015] As a preferred solution of the utility model, a limiting step is provided in the through hole of the mold frame, a limiting block is provided on the locking pin, and the limiting step limits the limiting block.
[0016] As a preferred solution of the utility model, the diameter of the center hole is larger than the diameter of the center column, and the diameter of the center hole is smaller than the diameter of the rivet. The center column of the captive screw can be inserted into the center hole of the punch, and the rivet of the captive screw can be pressed against the end face of the punch, so that when the punch is pressed down, the rivet can be opened by the end face of the punch and riveted to the surface of the countersunk hole of the mounting plate.
[0017] The beneficial effects of the utility model are:
[0018] The utility model adopts the same processing and installation basis for the punch and the pad column, which solves the problem that the punch and the captive screw riveted parts are not concentric and vertical when manually knocked. The device adopts a servo electronic crimping machine for riveting, and the pressure is adjustable and linear, which solves the problem that the manual knocking force cannot be controlled and is uneven. The invention achieves the effect of stable quality and good consistency of riveting captive screws. The device has high riveting efficiency and simple operation. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic diagram of the structure of the utility model before stamping;
[0020] Figure 2 yes Figure 1 A partial enlarged view of the middle A;
[0021] Figure 3 yes Figure 1 A partial enlarged view of point B in the middle;
[0022] Figure 4 It is a schematic diagram of the structure of the utility model during stamping;
[0023] Figure 5 yes Figure 4 A partial enlarged view of point C in the middle.
[0024] In the figure: 1-die frame; 2-cushion column; 3-captive screw; 4-mounting plate; 5-punch; 6-support block; 7-rubber pad; 8-tightening mechanism; 9-locking mechanism; 31-rivet piece; 32-center column; 41-riveting countersunk hole; 51-center hole; 52-groove; 81-first connecting piece; 82-second connecting piece; 83-tension spring; 91-locking pin; 92-locking column; 93-compression spring; 94-limiting block. DETAILED DESCRIPTION
[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.
[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.
[0027] like Figure 1 to Figure 4 As shown, the captive screw riveting device of this embodiment comprises a die frame 1, a pad column 2 is connected to the die frame 1, a captive screw 3 is placed in the pad column 2, a mounting plate 4 is provided on the pad column 2, a riveting countersunk hole 41 is provided on the mounting plate 4, the upper part of the captive screw 3 is sleeved in the riveting countersunk hole 41, and a movable punch 5 is sleeved on the die frame 1; a center hole 51 is provided at the lower end of the punch 5, the captive screw 3 comprises a rivet part 31 and a center column 32 sleeved in the rivet part 31, and the center column 32 and the center hole 51 are concentric.
[0028] Furthermore, the support block 6 is provided on the outer sleeve of the cushion column 2, and the mounting plate 4 is arranged on the support block 6. The support block 6 can support the mounting plate 4 to ensure the stability of the mounting plate 4. The support block 6 is sleeved on the cushion column 2 to ensure the stability of the position of the support block 6, thereby ensuring the stability of the position of the mounting plate 4 on the support block 6.
[0029] A rubber pad 7 is also provided between the mounting plate 4 and the pad column 2. The utility model adopts the rubber pad 7 to solve the problem that the height of the riveted part 31 of the captive screw 3 is affected by its own processing accuracy and spring contraction.
[0030] The shape of the rivet countersunk hole 41 is trumpet-shaped, the shape of the lower end of the punch 5 is truncated cone-shaped, and the cone angle of the rivet countersunk hole 41 is equal to the cone angle of the lower end of the punch 5. When the punch 5 is pressed down, the truncated cone-shaped portion of the lower end of the punch 5 can open the riveted piece 31 until it contacts the trumpet-shaped rivet countersunk hole 41, thereby achieving reliable rivet.
[0031] Furthermore, a tightening mechanism 8 is connected between the punch 5 and the die frame 1 for pressing the lower end of the cushion column 2 against the captive screw 3. The punch 5 is pressed against the rivet 31 of the captive screw 3 by the pulling force of the tightening mechanism 8 for pre-positioning, ensuring that the center hole 51 of the punch 5 can be reliably matched with the center column 32.
[0032] Specifically, the clamping mechanism 8 includes a first connecting member 81, which is fixed on the punch 5, and a second connecting member 82 is fixed on the die frame 1, which is located at the lower side of the first connecting member 81, and a tension spring 83 is connected between the first connecting member 81 and the second connecting member 82. When the first connecting member 81 on the punch 5 is pulled downward, the punch 5 is pressed downward by the tension of the tension spring 83 and pressed against the rivet 31 of the captive screw 3, so as to ensure the stable position of the punch 5 during punching. The first connecting member 81 and the second connecting member 82 can be screws.
[0033] Furthermore, the die frame 1 is connected with a locking mechanism 9 for positioning the punch 5. When the locking mechanism 9 locks and positions the punch 5, the punch 5 is separated from the cushion column 2 by a certain distance, so that the captive screw 3 is conveniently placed in the mounting hole of the cushion column 2.
[0034] Specifically, the locking mechanism 9 includes a locking pin 91, a through hole is provided on the die frame 1, the through hole is communicated with the mounting hole of the punch 5, the locking pin 91 is sleeved in the through hole, a groove 52 is provided on the side of the punch 5, one end of the locking pin 91 is engaged with the groove 52, a locking column 92 is connected to the die frame 1, and a compression spring 93 is pressed between the locking column 92 and the locking pin 91. The compression spring 93 pushes the locking pin 91 toward the direction of the punch 5, and the locking pin 91 is engaged with the groove 52 of the punch 5, so that the punch 5 can be positioned at a determined position.
[0035] A limiting step is arranged in the through hole of the mold frame 1 , a limiting block 94 is arranged on the locking pin 91 , and the limiting step limits the limiting block 94 .
[0036] It should be noted that the diameter of the center hole 51 is larger than the diameter of the center column 32, and the diameter of the center hole 51 is smaller than the diameter of the rivet 31. The center column 32 of the captive screw 3 can be inserted into the center hole 51 of the punch 5, and the rivet 31 of the captive screw 3 can be pressed against the end face of the punch 5, so that when the punch 5 is pressed down, the rivet 31 can be opened by the end face of the punch 5 and riveted to the surface of the countersunk hole 41 of the mounting plate 4.
[0037] The utility model adopts the same processing and installation basis for the punch 5 and the pad column 2, and the punch 5 is subjected to the tension of the tension spring 83 to press against the rivet 31 of the captive screw 3 for pre-positioning, which solves the problem that the punch 5 and the rivet 31 of the captive screw 3 are not concentric and vertical when manually knocked. The utility model adopts the rubber pad 7 to solve the problem that the height of the rivet 31 of the captive screw 3 is affected by its own processing accuracy and spring contraction. The device adopts a servo electronic crimping machine for riveting, and the pressure is adjustable and linear, which solves the problem that the manual knocking force cannot be controlled and is uneven. The utility model achieves the effect of stable riveting quality and good consistency of the captive screw 3. The device has high riveting efficiency and simple operation.
[0038] Installation method:
[0039] Glue the rubber pad 7 to the pad column 2; install the pad column 2 into the mold frame 1 through the thread; and put the support block 6 on the pad column 2 through the through hole. Insert the punch 5 into the mold frame 1 from top to bottom; insert the locking pin 91 into the mold frame 1 from right to left, tighten it with the compression spring 93, and then tighten it with the locking column 92 through the thread, and adjust the position of the punch 5 so that the head of the locking pin 91 is against the groove 52 of the punch 5 to limit the position. Install one screw into the punch 5, and the other screw into the mold frame 1, and install the tension spring 83 between the two screws.
[0040] Working principle:
[0041] The mounting hole of the punch 5 of the mold frame 1 is concentric with the mounting hole of the pad column 2. Place the captive screw 3 into the hole of the pad column 2, and the punch 5 is concentric with the rivet 31 of the captive screw 3. Sleeve the flip-over countersunk hole 41 of the mounting plate 4 on the rivet 31 of the captive screw 3, and place it on the support block 6. The front of the mounting plate 4 is pressed against the rubber pad 7 due to gravity. Pull the screw on the punch 5 downward to overcome the leftward thrust of the locking pin 91 and the compression spring 93. The punch 5 is pressed downward by the tension of the tension spring 83 and rests on the rivet 31 of the captive screw 3. Control the servo electronic crimping machine head to move downward, driving the punch 5 to press down, flipping over the rivet 31 of the captive screw 3, and pressing against the surface of the flip-over countersunk hole 41 of the mounting plate 4.
[0042] The servo electronic crimping machine is controlled to return the pressure head upward, and the screw on the punch 5 is pulled upward until the locking pin 91 abuts against the groove 52 of the punch 5, the punch 5 is limited, a new captive screw 3 is placed, and the riveting is repeated.
[0043] The present utility model is not limited to the above-mentioned optional implementation modes. Anyone can derive other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in the shape or structure, all technical solutions that fall within the scope defined by the claims of the present utility model fall within the protection scope of the present utility model.
Claims
1. A riveting device for captive screws, characterized in that: The invention comprises a mold frame (1), a cushion column (2) is connected to the mold frame (1), a captive screw (3) is placed in the cushion column (2), a mounting plate (4) is arranged on the cushion column (2), a riveting countersunk hole (41) is arranged on the mounting plate (4), the upper part of the captive screw (3) is sleeved in the riveting countersunk hole (41), and a movable punch (5) is sleeved on the mold frame (1); a center hole (51) is arranged at the lower end of the punch (5), and the captive screw (3) comprises a riveting piece (31) and a center column (32) sleeved in the riveting piece (31), and the center column (32) and the center hole (51) are concentric.
2. A captive screw riveting device according to claim 1, characterized in that: The cushion column (2) is provided with a support block (6) on its outer sleeve, and the mounting plate (4) is arranged on the support block (6).
3. A captive screw riveting device according to claim 2, characterized in that: A rubber pad (7) is also provided between the mounting plate (4) and the pad column (2).
4. The device for riveting captive screws according to claim 1, characterized in that: The shape of the riveting countersunk hole (41) is a trumpet shape, the shape of the lower end of the punch (5) is a truncated cone shape, and the cone angle of the riveting countersunk hole (41) is equal to the cone angle of the lower end of the punch (5).
5. The device for riveting captive screws according to claim 1, characterized in that: A tightening mechanism (8) for pressing the lower end of the cushion column (2) against the captive screw (3) is connected between the punch (5) and the die frame (1).
6. A captive screw riveting device according to claim 5, characterized in that: The tightening mechanism (8) comprises a first connecting member (81), the first connecting member (81) is fixed on the punch (5), a second connecting member (82) is fixed on the die frame (1), the second connecting member (82) is located at the lower side of the first connecting member (81), and a tension spring (83) is connected between the first connecting member (81) and the second connecting member (82).
7. The device for riveting captive screws according to claim 1, characterized in that: The die frame (1) is connected to a locking mechanism (9) for positioning the punch (5).
8. The device for riveting captive screws according to claim 7, characterized in that: The locking mechanism (9) comprises a locking pin (91), a through hole is provided on the die frame (1), the through hole is communicated with the mounting hole of the punch (5), the locking pin (91) is sleeved in the through hole, a groove (52) is provided on the side of the punch (5), one end of the locking pin (91) is engaged with the groove (52), a locking column (92) is connected to the die frame (1), and a compression spring (93) is pressed between the locking column (92) and the locking pin (91).
9. A captive screw riveting device according to claim 8, characterized in that: A limiting step is arranged in the through hole of the mold frame (1), a limiting block (94) is arranged on the locking pin (91), and the limiting step limits the limiting block (94).
10. A captive screw riveting device according to any one of claims 1 to 9, characterized in that: The diameter of the central hole (51) is greater than the diameter of the central column (32), and the diameter of the central hole (51) is smaller than the diameter of the riveted piece (31).