Rear through ejector rod stroke fine adjustment mechanism of cold header

Abstract

The utility model discloses a rear through ejector rod stroke fine adjustment mechanism of a cold header. The rear through ejector rod stroke fine adjustment mechanism aims to solve the problem that due to the fact that the adjustment position of an existing adjustment mechanism is close to the lower portion, small-range size error adjustment efficiency is low. The mechanism comprises a rack, a transmission swing arm, an ejector pin, a rear through ejector rod, a push rod, a threaded pipe and an adjusting structure, the upper end part of the transmission swing arm is in threaded connection with an ejector pin; the adjusting structure drives an adjusting gear through a hand wheel, a transmission gear drives a tooth pipe to rotate, and axial position adjustment of a push rod is achieved. The locking plate locks the position of the tooth pipe through the inclined threads. The operating position of the mechanism moves upwards, adjustment is convenient, bar size errors can be rapidly compensated, and production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of cold heading equipment, specifically to a fine-tuning mechanism for adjusting the stroke of the push rod after cold heading, which is particularly suitable for scenarios where the push rod stroke can be quickly adjusted after changing to different specifications of bar stock. Background Technology

[0002] Cold heading forming machines use a cold heading punch and a rear-through ejector rod to form and eject metal wire. Existing rear-through stroke adjustment mechanisms (such as CN 223097918 U) change the ejector rod stroke by adjusting the extension and retraction of the low-position support rod of the transmission swing arm. However, this has the following drawbacks: if there is a small dimensional error after changing the bar stock, and the start and end positions of the stroke need to be adjusted, the support rod adjustment position is too low (requiring deep access into the equipment), making adjustment time-consuming, labor-intensive, and inefficient. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a fine-tuning mechanism for the stroke of the push rod in a cold heading machine. By optimizing the position and locking method of the adjustment structure, the stroke of the push rod can be conveniently and accurately adjusted, thereby improving adjustment efficiency.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a fine-tuning mechanism for the stroke of a rear-through ejector rod of a cold heading machine, comprising a frame, on which a transmission swing arm capable of reciprocating around a fixed axis at a certain angle is mounted; the upper end of the transmission swing arm is threadedly connected to a telescopically adjustable ejector pin, the telescopic direction of the ejector pin being perpendicular to the swing direction of the transmission swing arm; the rear-through ejector rod penetrates into the cavity of the cold heading bottom mold, and a push rod is provided between its rear end and the ejector pin; the push rod is axially slidably sleeved in the inner hole of the threaded tube, and the peripheral wall of the threaded tube is provided with an external transmission threaded portion; an adjustment structure is provided corresponding to the threaded tube, the adjustment structure comprising a platform disposed above the threaded tube, and an adjustment gear rotatably connected below the platform. A transmission gear is fitted onto the external drive thread of the tooth tube, and the transmission gear meshes with the adjusting gear for transmission. A rotating shaft is rotatably mounted on the platform, and the lower end of the rotating shaft is connected to the central shaft of the adjusting gear through a bevel gear set. A handwheel is configured on the upper end of the rotating shaft. A locking plate is inserted into the platform, and the lower end of the locking plate has a threaded through hole adapted to the external drive thread of the tooth tube. The upper end of the locking plate protrudes from a window on the platform, and a protruding plate is provided on the platform corresponding to the upper end of the locking plate. A locking bolt is screwed onto the protruding plate. When the locking bolt is rotated forward, it abuts against the upper end of the locking plate, causing the locking plate to shift. The threads in its threaded through hole tilt and make tight contact with the external drive thread of the tooth tube, thereby locking the position of the tooth tube.

[0005] Furthermore, the ejector pin is connected to the upper end of the transmission swing arm by a thread, and the initial collision contact position between the ejector pin and the push rod can be adjusted by rotating the ejector pin.

[0006] Furthermore, the inner hole of the tooth tube is clearance-fitted with the push rod, allowing the push rod to slide axially along the tooth tube but restricting its radial offset.

[0007] Furthermore, the bevel gear set includes a first bevel gear fixed to the lower end of the rotating shaft and a second bevel gear fixed to the central shaft of the adjusting gear. The two mesh and drive each other to convert the rotational motion of the rotating shaft into the rotational motion of the adjusting gear.

[0008] Furthermore, the threaded through hole of the locking plate and the external drive thread of the tooth tube are both trapezoidal threads or triangular threads, and the inclination angle of the inclined thread matches the thread profile angle to ensure self-locking during locking.

[0009] The beneficial effects of this utility model are:

[0010] 1. Improved ease of adjustment: The handwheel drives the adjustment gear and transmission gear to rotate the tooth tube, realizing the axial adjustment of the initial position of the push rod, replacing the traditional low-position support rod telescopic adjustment. The operating position is moved to the top of the equipment, eliminating the need to go deep inside and significantly reducing the difficulty of operation.

[0011] 2. Dual adjustment mechanism: The thread extension adjustment of the ejector pin and the axial position adjustment of the toothed tube work together to adjust the initial contact position between the ejector pin and the push rod, and to precisely adjust the overall stroke of the push rod, covering the compensation needs of small-range dimensional errors.

[0012] 3. High locking reliability: The locking plate fits tightly with the threaded part of the toothed tube through the inclined screw thread, and uses the self-locking property of the thread to prevent the toothed tube from loosening, ensuring the stability of the position after adjustment and avoiding stroke deviation caused by vibration.

[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 the working state of a specific embodiment of the present utility model;

[0015] Figure 2 This is an installation state diagram of the adjustment structure in a specific embodiment of this utility model;

[0016] Figure 3 This is a perspective view of the adjustment structure in a specific embodiment of this utility model.

[0017] Explanation of reference numerals in the attached drawings: 1-Frame; 2-Transmission swing arm; 3-Ejector pin; 4-Rear through ejector rod; 5-Push rod; 6-Threaded tube; 61-External transmission threaded part; 7-Table plate; 8-Adjusting gear; 9-Transmission gear; 10-Rotating shaft; 14-Locking plate; 141-Threaded through hole; 15-Locking bolt; 16-Window; 17-Protruding plate. Detailed Implementation

[0018] 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.

[0019] like Figure 1 — Figure 3 As shown, this embodiment discloses as follows: Figures 1 to 3 As shown, the fine-tuning mechanism for the stroke of the rear push rod of the cold heading machine is installed on the frame 1 of the cold heading machine. It is mainly used to adjust the stroke of the rear push rod 4 to meet the ejection requirements of bars of different specifications.

[0020] Structural composition:

[0021] • The transmission swing arm 2 is mounted on the frame 1 via a fixed shaft and can swing back and forth within a certain angle around the fixed shaft. Its swing is driven by the eccentric connecting rod of the cold heading machine.

[0022] • The ejector pin 3 is threaded to the upper end of the transmission swing arm 2. By rotating the ejector pin 3, its axial extension length can be adjusted, thereby changing its initial collision contact position with the push rod 5.

[0023] • The rear push rod 4 is inserted into the cold heading bottom mold cavity, and its rear end is attached to the push rod 5; the push rod 5 is slidably sleeved in the inner hole of the thread tube 6, and the outer peripheral wall of the thread tube 6 is provided with an external transmission thread 61.

[0024] • The platform 7 is fixed on the frame 1 and located above the thread tube 6. The adjusting gear 8 is rotatably connected to the lower part of the platform 7. The transmission gear 9 meshes with the adjusting gear 8. The central shaft of the adjusting gear 8 is connected to the lower end of the rotating shaft 10 through a bevel gear set (first bevel gear and second bevel gear). The upper end of the rotating shaft 10 extends out of the platform 7 and is fixedly connected to a handwheel. By rotating the handwheel, the rotating shaft 10, the first bevel gear, the second bevel gear and the adjusting gear 8 can be driven to rotate synchronously, thereby driving the thread tube 6 to move axially. The thickness of the adjusting gear 8 is adapted to the length of the external transmission thread 61, so that the axial adjustment range of the thread tube can be larger.

[0025] • The locking plate 14 is inserted into the window 16 of the platform 7. Its lower end is provided with a threaded through hole 141 that is adapted to the external drive thread 61 of the tooth tube 6. The tooth tube 6 is screwed onto the internal thread of the threaded through hole 141. The protruding plate 17 is fixed on the platform 7 and is screwed with a locking bolt 15. When the locking bolt 15 is rotated forward and abuts against the upper end of the locking plate 14, the locking plate 14 is offset. The thread in its threaded through hole 141 is tilted and tightly fits against the external drive thread 61 of the tooth tube 6, which greatly improves the friction of the threaded drive engagement and realizes the position locking of the tooth tube 6.

[0026] Working process: After changing the bar stock, if it is necessary to adjust the stroke of the push rod 4:

[0027] 1. First, rotate the ejector pin 3 and adjust its initial collision contact position with the push rod 5 by adjusting the thread extension and retraction to compensate for the relative position error between the ejector pin 3 and the push rod 5;

[0028] 2. Rotate the handwheel to drive the adjusting gear 8 to rotate via the rotating shaft 10 and the bevel gear set. The adjusting gear 8 meshes with the external transmission thread 61 of the toothed tube 6, causing the toothed tube 6 to move axially, thereby pushing the push rod 5 to slide along the inner hole of the toothed tube 6 and adjusting the initial position of the push rod 5.

[0029] 3. After confirming that the adjustment is in place by observing the stroke scale or measuring the ejected forming bar (not shown in the figure), rotate the locking bolt 15 to offset the locking plate 14. Its inclined threads will fit tightly with the external transmission thread 61 of the tooth tube 6, locking the position of the tooth tube 6 and preventing it from loosening after adjustment.

[0030] 4. When the transmission swing arm 2 swings, the ejector pin 3 collides with the push rod 5. The push rod 5 pushes the ejector rod 4 into the cold heading bottom mold cavity, ejecting the formed workpiece and completing one ejection action.

Claims

1. A fine-tuning mechanism for the stroke of a rear push rod of a cold heading machine, comprising a frame (1), on which a transmission swing arm (2) capable of reciprocating around a fixed axis is mounted; the upper end of the transmission swing arm (2) is provided with a telescopically adjustable ejector pin (3); the rear push rod (4) penetrates into the cavity of the cold heading bottom mold, and a push rod (5) is provided between its rear end and the ejector pin (3); characterized in that: The push rod (5) is slidably sleeved in the inner hole of the tooth tube (6) along the axial direction. The tooth tube (6) has an external transmission thread (61) on its peripheral wall. An adjustment structure is provided corresponding to the tooth tube (6). The adjustment structure includes a platform (7) set above the tooth tube (6). An adjustment gear (8) is rotatably connected below the platform (7). A transmission gear (9) is sleeved on the external transmission thread (61) of the tooth tube (6). The transmission gear (9) meshes with the adjustment gear (8). A rotating shaft (10) is rotatably installed on the platform (7). The lower end of the rotating shaft (10) is connected to the central shaft of the adjustment gear (8) through a bevel gear set. A handwheel is provided at the upper end of the rotating shaft (10). A locking plate (14) is inserted on the platform (7). The lower end of the locking plate (14) has a threaded through hole (141) that is adapted to the external transmission thread (61) of the tooth tube (6).

2. The fine-tuning mechanism for the stroke of the rear through-hole rod of the cold heading machine according to claim 1, characterized in that: The upper end of the locking plate (14) protrudes through the window (16) of the platform (7). A protruding plate (17) is provided on the platform (7) corresponding to the upper end of the locking plate (14). A locking bolt (15) is screwed onto the protruding plate (17). When the locking bolt (15) rotates forward and abuts against the upper end of the locking plate (14), the locking plate (14) is offset, and the thread in its threaded through hole (141) tilts and comes into close contact with the external transmission thread (61) of the tooth tube (6), thereby locking the position of the tooth tube (6).

3. The fine-tuning mechanism for the stroke of the rear through-hole rod of the cold heading machine according to claim 1, characterized in that: The ejector pin (3) is connected to the upper end of the transmission swing arm (2) by a thread. The initial collision contact position between the ejector pin (3) and the push rod (5) can be adjusted by rotating the ejector pin (3).

4. The fine-tuning mechanism for the stroke of the rear through-hole rod of the cold heading machine according to claim 1, characterized in that: The inner hole of the tooth tube (6) is clearance-fitted with the push rod (5), allowing the push rod (5) to slide axially along the tooth tube (6) but restricting its radial offset.

5. The fine-tuning mechanism for the stroke of the rear through-hole rod of the cold heading machine according to claim 1, characterized in that: The bevel gear set includes a first bevel gear fixed to the lower end of the rotating shaft (10) and a second bevel gear fixed to the central shaft of the adjusting gear (8), which mesh and drive each other.

6. The fine-tuning mechanism for the stroke of the rear through-hole rod of the cold heading machine according to claim 1, characterized in that: The threaded through hole (141) of the locking plate (14) and the external transmission thread (61) of the tooth tube (6) are both trapezoidal threads or triangular threads.

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