Bar transfer arrangement for a cold header

Abstract

The utility model discloses a kind of bar conveying structure of cold header, belong to cold header accessory technical field. It aims to solve the technical problems of the pushing distance of the bar conveying structure of existing cold header, poor transmission stability, material clamping switching is easy to deviate. The utility model includes seat body, driving shaft, guide shaft, fixed clamping assembly, guide compression wheel assembly, movable clamping assembly are arranged on guide shaft, reset spring is equipped with movable clamping assembly, driving shaft is synchronous control two groups of clamping assembly opening and closing and displacement by transmission mechanism and pushing transmission mechanism;Pushing distance adjusting mechanism is additionally provided simultaneously, and bar pushing stroke is accurately adjusted by screw rod driving sliding block, inclined plate lifting, and the rotation deviation of movable clamping assembly is limited by the cooperation of guide groove and gyro wheel limiting structure. The utility model is compact in structure, conveying precision is high, adapts to different specifications bar, stability and versatility are significantly improved, and it is suitable for various cold header bar accurate feeding operation.

Description

Technical Field

[0001] This utility model belongs to the technical field of cold heading machine feeding equipment, specifically relating to a bar conveying structure for a cold heading machine. Background Technology

[0002] Cold heading machines are core processing equipment for fastener and hardware forming. They mainly use cold heading technology to stamp and form metal bars. Precise, stable, and quantitative feeding of the bars is a key process to ensure the accuracy of cold heading and the product qualification rate. Currently, most conventional cold heading machines on the market adopt a double-clamp alternating feeding mode, which achieves the step-by-step feeding of bars by switching between the opening and closing of fixed clamps and movable clamps.

[0003] The existing conveying structure has many defects: First, the pushing stroke is a fixed structure, which cannot adjust the conveying distance according to the different specifications and processing requirements of the bars. It has extremely poor versatility. For bars of different lengths, the entire set of conveying accessories must be replaced, resulting in high production costs and low debugging efficiency. Second, the movable clamping assembly relies solely on the guide shaft for sliding limit. During operation, it is easily affected by the bar clamping force and pushing force, causing circumferential deflection, resulting in misalignment of the clamping slot and bar offset, directly causing defective products in cold heading. Third, the transmission coordination accuracy of the clamping assembly opening and closing and pushing action is low. There is a gap in the switching connection between the fixed clamp and the movable clamp, which easily leads to problems such as bar slippage, feeding jamming, and large deviation in conveying accuracy, which seriously affects the consistency of cold heading processing. Fourth, there is no precise pushing limit adjustment structure. After long-term operation, component wear will cause the feeding stroke to deviate, which will significantly reduce the stability and service life of the equipment.

[0004] In summary, the existing bar conveying structure of cold heading machines has technical defects such as non-adjustable pushing distance, poor positioning stability, low feeding accuracy, and weak versatility, making it difficult to meet the production needs of high-precision, multi-specification bar cold heading. Therefore, it is urgent to optimize and improve a new type of bar conveying structure. Utility Model Content

[0005] This utility model addresses the shortcomings of existing technologies and solves the technical problems of fixed and non-adjustable pushing stroke of the bar conveying structure in existing cold heading machines, easy deviation during bar conveying, low clamping switching accuracy, and poor equipment versatility and operational stability.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a bar conveying structure for a cold heading machine, comprising a base, a drive shaft and a guide shaft mounted on the base, the drive shaft being driven to rotate by a motor, and a fixed clamp assembly, a guide pressure roller assembly, and a movable clamp assembly sequentially arranged on the guide shaft, the movable clamp assembly being slidably fitted onto the guide shaft via a guide sleeve, and capable of stable sliding along the axial direction of the guide shaft. The base is equipped with a guide output tube and a return spring, the return spring being positioned corresponding to the movable clamp assembly to achieve automatic axial return after the movable clamp assembly is pushed.

[0007] The drive shaft is equipped with a transmission mechanism. The rotation of the drive shaft synchronously drives the transmission mechanism, which in turn controls the opening and closing of the clamping jaws of both the fixed and movable clamping assemblies. Simultaneously, it drives the movable clamping assembly to move axially along the guide shaft, achieving coordinated feeding between the two clamping assemblies. The fixed clamping assembly forms a clamping structure through the cooperation of upper and lower clamping plates. The lower clamping plate has a clamping groove for positioning and clamping the bar. The movable clamping assembly integrates a movable seat structure, relying on a guide sleeve for sliding displacement. Combined with the clamping groove, it achieves precise clamping of the bar. Furthermore, both clamping grooves are coaxially aligned with the guide output tube, ensuring the straightness of the bar conveying.

[0008] The transmission mechanism adopts a double-cam linkage structure. Through the multi-stage transmission of the first cam, swing arm, connecting rod, and rocker frame, the synchronous opening and closing of the two clamping components is achieved. Simultaneously, a roller guide structure restricts the circumferential rotation of the movable clamping component, preventing clamping offset. The drive shaft is also equipped with a second cam to drive the push transmission arm. Combined with a dedicated push distance adjustment mechanism, the initial distance between the push transmission arm and the movable clamping component can be changed by adjusting the lifting of the screw, slider, and inclined plate, precisely controlling the bar pushing stroke of the movable clamping component to adapt to the conveying needs of bars of different specifications. A return spring continuously provides elasticity, ensuring that all transmission and contacting parts are always in close contact, eliminating transmission gaps and improving feeding accuracy.

[0009] The beneficial effects of this utility model are: 1. This utility model adds an independent pushing distance adjustment mechanism, which can accurately adjust the pushing stroke according to the bar specifications and processing requirements, breaking the limitations of the traditional fixed stroke, greatly improving the equipment versatility, and adapting to the processing of multiple specifications of bars without changing parts, thus reducing production and debugging costs.

[0010] 2. A limiting guide structure is set up to cooperate with the guide rod and the third roller to completely restrict the circumferential rotation of the movable clamping assembly, eliminate the problems of clamping groove misalignment and bar offset. In conjunction with the coaxially arranged clamping groove and guide output pipe, the straightness and positioning accuracy of bar conveying are greatly improved, and the processing defect rate is reduced.

[0011] 3. It adopts a multi-stage transmission structure with a single drive shaft and dual cams to achieve integrated linkage of clamp opening and closing, axial pushing and automatic reset. The action is tightly connected without gaps, avoiding bar slippage and jamming, improving feeding stability and continuity, and is suitable for high-speed cold heading processing conditions.

[0012] 4. The constant force contact design of the return spring ensures that all components of the adjustment mechanism and transmission mechanism are always in close contact, offsetting the transmission gap caused by component wear, ensuring stable long-term operation accuracy, effectively extending the service life of the equipment, and reducing equipment maintenance costs.

[0013] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0014] Figure 1 This is a perspective view of a specific embodiment of the present utility model; Figure 2 Internal structure of a specific embodiment of this utility model Figure 1 ; Figure 3 Internal structure of a specific embodiment of this utility model Figure 2 ; Figure 4 Internal structure of a specific embodiment of this utility model Figure 3 .

[0015] Explanation of reference numerals in the attached drawings: 1. Base; 2. Drive shaft; 3. Guide shaft; 4. Fixed clamp assembly; 41. First transmission arm; 42. First upper clamping plate; 43. First lower clamping plate; 44. First clamping groove; 5. Guide pressure roller assembly; 6. Movable clamp assembly; 61. Second transmission arm; 62. Movable base; 63. Second upper clamping plate; 64. Second lower clamping plate; 65. Second clamping groove; 66. Guide sleeve; 67. Guide arm; 68. Third roller; 7. Guide output pipe; 8. Return spring; 9. Transmission mechanism; 91. First cam; 92. First swing arm 93. Arm; 94. First connecting rod; 95. Second connecting rod; 96. Rocker frame; 97. First roller; 98. Limiting rod; 99. Connecting horizontal shaft; 100. Guide horizontal shaft; 101. Second roller; 10. Push transmission mechanism; 101. Second cam; 102. Push transmission arm; 103. Fourth roller; 11. Push distance adjustment mechanism; 111. Vertical seat; 112. Slider; 113. Screw; 114. Adjusting block; 115. Inclined plate; 116. Fifth roller; 117. Sixth roller; 12. Guide rod; 13. Guide groove. Detailed Implementation

[0016] The present invention will be described in detail below through embodiments, which are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention.

[0017] like Figure 1 — Figure 4 As shown, this embodiment discloses a bar conveying structure for a cold heading machine, including a base 1. A drive shaft 2 and a guide shaft 3 are rotatably mounted on the base 1 via bearings. A drive motor is fixedly connected to the end of the drive shaft 2, providing power output for the overall feeding action. A fixed clamp assembly 4, a guide pressure roller assembly 5, and a movable clamp assembly 6 are sequentially assembled on the guide shaft 3 from left to right along its own axial direction. The guide pressure roller assembly 5 vertically presses and positions the bar to prevent it from tilting or shifting upwards. The guide pressure roller assembly 5 includes a lower pressure roller and an upper pressure roller, with the upper pressure roller being driven to rise and fall by a cylinder.

[0018] A guide sleeve 66 is fixed to the bottom of the movable clamp assembly 6. The guide sleeve 66 is slidably sleeved on the guide shaft 3, allowing the movable clamp assembly 6 to slide smoothly along the axial direction of the guide shaft 3. A guide output tube 7 is fixedly installed on the right side of the base 1 for guiding the output of the bar. A return spring 8 is assembled between the base 1 and the movable clamp assembly 6. One end of the return spring 8 abuts against the base 1, and the other end abuts against the movable seat 62 of the movable clamp assembly 6, for automatic axial reset of the movable clamp assembly 6 after the pushing operation.

[0019] The fixed clamp assembly 4 includes a first transmission arm 41, a first upper clamping plate 42 and a first lower clamping plate 43. The first upper clamping plate 42 is rotatably mounted on the base 1 via a rotating shaft. The first upper clamping plate 42 is fixedly assembled at the front end of the first transmission arm 41. The first lower clamping plate 43 is fixedly embedded in the base 1. The top surface of the first lower clamping plate 43 is provided with a first clamping groove 44 for fitting and clamping the bar.

[0020] The movable clamping assembly 6 includes a second transmission arm 61, a movable seat 62, a second upper clamping plate 63, and a second lower clamping plate 64. The guide sleeve 66 and the second lower clamping plate 64 are both fixed to the movable seat 62 by bolts. The second upper clamping plate 63 is rotatably mounted on the movable seat 62 via a rotating shaft. The second upper clamping plate 63 is fixed to the front end of the second transmission arm 61. The top surface of the second lower clamping plate 64 is provided with a second clamping groove 65. The first clamping groove 44 and the second clamping groove 65 are coaxially aligned with the central axis of the guide output pipe 7 to ensure that the bar is conveyed horizontally and linearly.

[0021] A transmission mechanism 9 is provided between the drive shaft 2 and the fixed clamp assembly 4 and the movable clamp assembly 6. The transmission mechanism 9 includes a first cam 91, a first swing arm 92, a first connecting rod 93, a second connecting rod 94, and a rocker frame 95. The first cam 91 is fixedly sleeved on the drive shaft 2. The first swing arm 92 is rotatably mounted on the base 1 via a rotating shaft. The rotation of the first cam 91 can drive the first swing arm 92 to perform a reciprocating swinging motion. The right end of the first swing arm 92 is hinged to the first connecting rod 93, and the top end of the first connecting rod 93 is hinged to the tail end of the first transmission arm 41. The left end of the first swing arm 92 is hinged to the second connecting rod 94. The right end of the first swing arm 92 is heavier and has a lower roller that contacts the first cam. Therefore, when the first cam 91 rotates, the lower roller always hangs down and fits against the peripheral wall of the first cam, thereby driving the first transmission arm to perform a reciprocating swinging motion.

[0022] A rocker arm 95 is rotatably mounted on the base 1 above the second connecting rod 94 via a pivot. A first roller 96 is fitted to the left end of the rocker arm 95. A limiting rod 97 is fixedly mounted on the base 1 above the first roller 96, limiting the upward travel of the first roller 96 and thus restricting the overall swing amplitude of the rocker arm 95. A horizontal shaft 98 and a guide horizontal shaft 99 are fixedly connected to the right end of the rocker arm 95. The top end of the second connecting rod 94 is hinged to the connecting horizontal shaft 98. A second roller 100 is fitted to the rear end of the second transmission arm 61. The second roller 100 is rolled and engaged on the outside of the guide horizontal shaft 99, allowing it to roll freely along the length of the guide horizontal shaft 99.

[0023] A guide arm 67 is fixed to the left side wall of the movable seat 62, and a third roller 68 is assembled at the end of the guide arm 67. Two parallel and symmetrically arranged guide rods 12 are fixed inside the seat body 1. The gap between the two guide rods 12 forms a guide groove 13. The third roller 68 is rolled and engaged inside the guide groove 13. Through the cooperation between the third roller 68 and the guide groove 13, the circumferential rotation of the movable seat 62 along the guide shaft 3 is strictly restricted, so as to ensure the clamping and positioning accuracy.

[0024] The second cam 101 is fixedly sleeved on the drive shaft 2 to the side of the first cam 91. The push transmission arm 102 is rotatably mounted on the seat 1 via a rotating shaft. The lower end of the push transmission arm 102 is equipped with a fourth roller 103, which rolls with the wheel surface of the second cam 101. The upper end of the push transmission arm 102 is inclined and drives the movable seat 62 to form a push transmission mechanism 10. The second cam 101 rotates to drive the push transmission arm 102 to swing, thereby pushing the movable clamp assembly 6 to move axially.

[0025] A pushing distance adjustment mechanism 11 is provided between the movable clamp assembly 6 and the pushing transmission arm 102. The pushing distance adjustment mechanism 11 includes a vertical seat 111, a slider 112, a screw 113, an adjusting block 114, and an inclined plate 115. The vertical seat 111 is fixed to the seat body 1 by bolts. A vertical groove is provided on the vertical seat 111, and the slider 112 is vertically slidably assembled in the vertical groove. The screw 113 is vertically rotatably mounted on the vertical seat 111 through a bearing. The screw 113 is threadedly connected to the slider 112. The adjusting block 114 is fixedly assembled at the top of the screw 113. By turning the adjusting block 114, the screw 113 can be driven to rotate in both directions, thereby driving the slider 112 to rise and fall vertically.

[0026] The outer end of the slider 112 is rotatably mounted with the inclined plate 115 via a pivot. The lower end of the inclined plate 115 is fixedly mounted with the fifth roller 116, which rolls in contact with the top surface of the inclined arm of the push transmission arm 102. The movable seat 62 is fixedly mounted with the sixth roller 117 on the side facing the inclined plate 115. The return spring 8 is always in a compressed state, continuously pushing the movable seat 62 so that the sixth roller 117 is always tightly pressed against the inclined plate surface of the inclined plate 115. The inclined plate 115 is inclinedly inserted between the movable clamp assembly 6 and the push transmission arm 102. The slider 112 drives the inclined plate 115 to rise and fall, which can change the effective stroke of the push transmission arm 102 to achieve precise adjustment of the bar pushing distance.

[0027] The working process of this utility model is as follows: When the equipment is running, the drive motor drives the drive shaft 2 to rotate continuously. In the initial state, the first upper clamping plate 42 and the first lower clamping plate 43 of the fixed clamping assembly 4 are closed, and the front end of the bar is clamped through the first clamping groove 44. The guide pressure roller assembly 5 presses and positions the bar, and the front end of the bar extends to the position of the movable clamping assembly 6. The drive shaft 2 drives the first cam 91 to rotate, drives the first swing arm 92 to swing, and drives the fixed clamping assembly 4 and the movable clamping assembly 6 to move through the linkage transmission, realizing the reverse linkage of the two clamping assemblies opening and closing: At this time, the fixed clamping assembly 4 remains in a closed clamping state, and at the same time, the second transmission arm 61 is driven to move through the rocker frame 95, the guide horizontal shaft 99, and the second roller 100 to open the clamping mouth of the movable clamping assembly 6. At the same time, the push transmission arm 102 is driven to swing, pushing the movable seat 62 to move along the guide shaft 3 towards the guide pressure roller assembly 5, so that the movable clamping assembly 6 moves forward and clamps the front end of the bar.

[0028] After clamping is completed, the transmission mechanism 9 reverses direction again, causing the movable clamp assembly 6 to close and the fixed clamp assembly 4 to open, releasing the fixed clamp assembly 4 from clamping the bar and forming a stable alternating clamping action. At this time, the push transmission arm 102 resets, and the movable clamp assembly 6 returns axially under the elastic force of the reset spring 8, pulling the bar into the guide output tube 7 to complete one quantitative feeding. If the feeding distance needs to be adjusted, simply turn the adjusting block 114, which drives the slider 112 and the inclined plate 115 to rise and fall through the screw 113, changing the support height of the inclined plate 115, thereby adjusting the pushing stroke of the push transmission arm 102 on the movable seat 62 to adapt to different processing requirements.

[0029] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A bar conveying structure for a cold heading machine, comprising a base (1), wherein a drive shaft (2) and a guide shaft (3) are rotatably mounted on the base (1), and the drive shaft (2) is connected to a drive motor, characterized in that: The guide shaft (3) is sequentially equipped with a fixed clamp assembly (4), a guide pressure roller assembly (5), and a movable clamp assembly (6) along the axial direction. The movable clamp assembly (6) is slidably sleeved on the guide shaft (3) through a guide sleeve (66). A guide output tube (7) is fixed on the seat (1), and a reset spring (8) for axial reset is installed between the seat (1) and the movable clamp assembly (6). A transmission mechanism (9) is provided between the drive shaft (2) and the fixed clamp assembly (4) and the movable clamp assembly (6). The transmission mechanism (9) is used to synchronously drive the opening and closing of the clamps of the fixed clamp assembly (4) and the movable clamp assembly (6). The axial displacement of the movable clamp assembly (6) is achieved through a push transmission mechanism (10). A push distance adjustment mechanism (11) is also provided between the push transmission mechanism (10) and the movable clamp assembly (6). The push distance adjustment mechanism (11) can adjust the rod push stroke of the movable clamp assembly (6).

2. The bar conveying structure of the cold heading machine according to claim 1, characterized in that: The fixed clamp assembly (4) includes a first transmission arm (41), a first upper clamping plate (42) and a first lower clamping plate (43). The first upper clamping plate (42) is rotatably mounted on the base (1) and fixed to the front end of the first transmission arm (41). The first lower clamping plate (43) is fixed on the base (1) and a first clamping groove (44) is provided on the first lower clamping plate (43).

3. The bar conveying structure of the cold heading machine according to claim 1, characterized in that: The movable clamping assembly (6) includes a second transmission arm (61), a movable seat (62), a second upper clamping plate (63), and a second lower clamping plate (64). The guide sleeve (66) and the second lower clamping plate (64) are both fixed on the movable seat (62). The second upper clamping plate (63) is rotatably mounted on the movable seat (62) and fixed to the front end of the second transmission arm (61). A second clamping groove (65) is provided on the second lower clamping plate (64).

4. The bar conveying structure of the cold heading machine according to claim 1, characterized in that: The transmission mechanism (9) includes a first cam (91) fixed on the drive shaft (2) and a first swing arm (92) rotatably mounted on the seat (1). The first cam (91) drives the first swing arm (92) to swing. The right end of the first swing arm (92) is hinged to the tail end of the first transmission arm (41) through the first connecting rod (93). The left end of the first swing arm (92) is hinged to the second connecting rod (94). A rocker frame (95) is rotatably mounted on the seat (1). One end of the rocker frame (95) is equipped with a first roller (96). The seat (1) is equipped with a limiting rod (97) located above the first roller. The other end of the rocker frame (95) is provided with a connecting horizontal shaft (98) and a guide horizontal shaft (99). The second connecting rod (94) is hinged to the connecting horizontal shaft (98). The movable clamp assembly (6) is equipped with a second roller (100) that rolls along the guide horizontal shaft (99).

5. The bar conveying structure of the cold heading machine according to claim 3, characterized in that: The movable seat (62) is fixed with a guide arm (67) at one end, and a third roller (68) is fitted at the end of the guide arm (67); two parallel guide rods (12) are fixed inside the seat body (1), and the gap between the two guide rods (12) forms a guide groove (13). The third roller (68) rolls with the guide groove (13) to restrict the circumferential rotation of the movable seat (62).

6. The bar conveying structure of the cold heading machine according to claim 1, characterized in that: The push transmission mechanism (10) includes a second cam (101) fixed on the drive shaft (2) and a push transmission arm (102) rotatably mounted on the seat (1). One end of the push transmission arm (102) is equipped with a fourth roller (103) that rolls with the second cam (101), and the other end of the push transmission arm (102) is in transmission cooperation with the movable seat (62).

7. The bar conveying structure of the cold heading machine according to claim 1, characterized in that: The push distance adjustment mechanism (11) includes a vertical seat (111) fixed on the base (1), a slider (112) vertically slidably mounted on the vertical seat (111), and a screw (113) rotatably mounted on the vertical seat (111). The screw (113) and the slider (112) are threadedly driven together. An adjustment block (114) is fixed at the top of the screw (113). An inclined plate (115) is rotatably mounted on the side of the slider (112). A fifth roller (116) is fixed at the lower end of the inclined plate (115). The fifth roller (116) rolls in contact with the inclined arm of the push transmission arm (102). A sixth roller (117) is fixed on the movable clamp assembly (6). The return spring (8) pushes the movable clamp assembly (6) so that the sixth roller (117) is always in contact with the surface of the inclined plate (115).

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