Back top rod stroke moving type fine adjustment mechanism of cold heading machine

Abstract

The utility model discloses a rear through top rod stroke movable type fine adjustment mechanism of cold header, aims at solving the problem of the separate configuration adjusting mechanism of each station of the existing multi-station cold header, many parts, assembly is complicated, debugging efficiency is low, and the high cost problem. The utility model sets up a plurality of cold heading stations to the frame, and the horizontal guide rod is arranged on the upper portion of frame, and a set of shared tooth tube adjusting assembly is slidably assembled to the guide rod, the assembly contains swingable swing seat, the lower end of swing seat is equipped with driving gear, the end portion of station tooth tube is equipped with adjusting gear, and the swing seat is equipped with driving pivot with second bevel gear with hand wheel, and the frame is equipped with the positioning block corresponding to station one one, and the bottom of swing seat is equipped with positioning slot, and after sliding tooth tube adjusting assembly reaches target station, lower swing engages positioning block, and gear automatic alignment engages, and the hand wheel drives tooth tube to rotate telescopic, and adjusts push rod and rear through top rod stroke. The utility model only one set of shared tooth tube adjusting assembly adapts all stations, and the part amount is greatly reduced, and the manufacturing cost is reduced.

Description

Technical Field

[0001] This utility model belongs to the technical field of cold heading equipment, specifically relating to a mobile fine-tuning mechanism that is used in conjunction with a multi-station cold heading machine and can share a set of thread tube adjustment components to complete all stations before adjusting the stroke of the top rod. Background Technology

[0002] Cold heading machines rely on the cold heading punch and the rear push rod to complete the cold heading of metal wire and the ejection of the workpiece. Multi-station cold heading machines have multiple cold heading stations arranged in parallel along the frame. When processing bars of different specifications, it is necessary to adjust the ejection stroke of the rear push rod of each station individually to compensate for the dimensional error of the bar.

[0003] Prior art document CN223531350U discloses a fine-tuning mechanism for the stroke of the push rod in a cold heading machine. This solution designs an independent adjustment unit for each station: each station is equipped with an independent platform, rotating shaft, handwheel, adjusting gear, transmission gear, and locking plate—a complete set of adjustment parts. The handwheel drives the gear to rotate the threaded tube, adjusting the initial position of the push rod, thereby changing the stroke of the push rod. Although this solution moves the operating position upwards, solving the inconvenience of traditional low-position adjustment, it still has significant drawbacks: In multi-station equipment, each station needs to be equipped with a complete and independent adjustment mechanism, which doubles the number of parts and significantly increases the equipment manufacturing cost. The assembly of multiple sets of adjustment components is carried out separately, resulting in numerous assembly steps, high labor costs, and low production assembly efficiency. Multiple sets of gears, shafts, and handwheel assemblies operate synchronously, and multiple sets of parts wear out simultaneously under equipment vibration conditions, resulting in high maintenance and replacement costs in the later stages.

[0004] Existing technologies lack a universal fine-tuning structure that can move across workstations and a single set of dental tube adjustment components can be adapted to all workstations, making it impossible to simultaneously meet the needs of convenient adjustment and low-cost assembly and maintenance of multi-workstation equipment. Utility Model Content

[0005] To address the technical shortcomings of existing multi-station cold heading machines, which require a separate complete rear push rod adjustment mechanism for each cold heading station, resulting in a large number of parts, cumbersome assembly, high equipment production costs, and low efficiency in station-by-station debugging, this paper proposes a rear push rod stroke-moving fine-tuning mechanism for cold heading machines. This mechanism uses only one set of shared threaded tube adjustment components that can slide laterally along the station, enabling shared stroke adjustment across multiple stations. This reduces the number of parts, simplifies assembly processes, and, by relying on the precise alignment of gears between the positioning block and the positioning slot, significantly shortens station switching and debugging time, thereby reducing production and maintenance costs.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A fine-tuning mechanism for the stroke movement of a rear-through ejector rod in a cold heading machine includes a frame with several cold heading stations arranged side-by-side. Each cold heading station is uniformly equipped with a transmission swing arm, ejector pin, rear-through ejector rod, push rod, threaded tube, and threaded sleeve. The transmission swing arm is hinged to the frame and driven by the eccentric connecting rod of the cold heading machine to achieve fixed-angle reciprocating swing. The ejector pin is threadedly connected to the upper end of the transmission swing arm. Rotating the ejector pin can change the extension length of the ejector pin and adjust the initial collision contact position between the ejector pin and the push rod. The rear-through ejector rod passes through the cavity of the cold heading bottom mold, and the rear end face of the rear-through ejector rod abuts against the front end of the push rod. The push rod is axially slidably assembled in the inner hole of the threaded tube. The outer wall of the threaded tube is integrally formed with an external transmission thread. An adjusting gear is fixedly installed at the end of the threaded tube away from the push rod. The threaded sleeve is fixed at the corresponding station position on the frame. The internal thread of the threaded sleeve is threadedly engaged with the external transmission thread of the threaded tube. When the threaded tube rotates, it extends and retracts axially along the threaded sleeve, changing the overall initial position of the push rod.

[0007] The core improvement of this utility model is as follows: A guide rod is horizontally fixedly installed on the upper part of the frame, and an independent tooth tube adjustment assembly is slidably mounted on the guide rod. The entire tooth tube adjustment assembly includes a swing seat, which is slidably sleeved on the outside of the guide rod and can swing up and down relative to the guide rod; a drive gear is rotatably installed at the lower end of the swing seat, and a first bevel gear is fixed at the end of the central shaft of the drive gear; a drive shaft is vertically rotatably mounted inside the swing seat, and a second bevel gear is fixed at the lower end of the drive shaft. The second bevel gear can mesh with the first bevel gear to realize power transmission, and a handwheel is fixedly mounted on the upper end of the drive shaft extending out of the swing seat.

[0008] A positioning block is fixed on the frame for each cold heading station. A positioning slot matching the shape of the positioning block is opened at the bottom of the swing seat. When the operator adjusts the stroke of a certain station, the entire set of thread tube adjustment assembly is slid laterally along the guide rod to the top of the target station. The swing seat is swung downward so that the bottom positioning slot is engaged with the outside of the positioning block. After engagement, the swing seat maintains a horizontal and stable posture. The drive gear is precisely aligned and meshed with the adjustment gear at the end of the thread tube at the station. The handwheel is rotated, and the power is transmitted to the thread tube in sequence through the drive shaft, the second bevel gear, the first bevel gear, the drive gear, and the adjustment gear, which drives the thread tube to rotate. The thread tube achieves axial extension and retraction by relying on the engagement of the external transmission threaded part and the threaded sleeve, pushing the push rod to change the initial position, thereby adjusting the ejection stroke of the back through rod.

[0009] Further structural optimization: External threads are provided on the outer wall of the ejector pin, and a matching internal thread hole is opened at the upper end of the transmission swing arm. The ejector pin extension is finely adjusted by the thread engagement length to achieve small-range contact position compensation. A sliding bushing is added between the swing seat and the guide rod. This sliding bushing is an internal component of the dental tube adjustment assembly, reducing lateral sliding friction. Limiting blocks are installed at both ends of the guide rod to limit the sliding limit of the entire dental tube adjustment assembly and prevent disengagement. The positioning block is a square boss, and the positioning slot is a square groove, ensuring no offset after engagement and stable gear meshing. A swing locking bolt is added to the swing seat. This locking bolt is a matching locking part of the dental tube adjustment assembly; after engaging the positioning block, it locks and fixes the swing angle, preventing gear disengagement during adjustment. The dental tube inner hole and the push rod are clearance-fitted, allowing only axial sliding of the push rod and limiting radial movement. The first and second bevel gears are equal-module bevel gears, while the drive gear and adjustment gear are standard spur gears, ensuring smooth transmission.

[0010] The beneficial effects of this utility model 1. Significantly reduce equipment manufacturing costs: The entire machine is equipped with only one set of shared tooth tube adjustment components, which replaces the traditional multi-station matching of multiple sets of handwheels, shafts, and gear components, reducing more than 80% of adjustment parts and significantly reducing raw material procurement and processing costs; 2. Simplified assembly process and shortened assembly time: Only one set of tooth tube adjustment components needs to be assembled and fixed. There is no need to install adjustment gears, shafts, handwheels and locking parts at each station, which greatly improves the overall assembly efficiency of the equipment. 3. Convenient workstation switching and adjustment, and high debugging efficiency: Operators only need to slide the entire set of dental tube adjustment components laterally to the target workstation. The gears are automatically aligned by the positioning block and the positioning slot. There is no need to repeatedly calibrate the gear meshing position. The debugging time for multi-station products is reduced by more than 60%. 4. Strong structural stability and reliable adjustment accuracy: After the square positioning block and the positioning slot are fully engaged, the swing seat remains horizontal, the gear meshing is without deviation, there is no skipping of teeth or slippage during the adjustment process, and the stroke adjustment accuracy is stable; the swing locking bolt locks the swing seat, and the gear will not disengage under equipment vibration conditions, avoiding stroke deviation. 5. Dual stroke adjustment and compensation, adaptable to multiple specifications of bar stock: The initial contact gap between the ejector pin and the push rod can be finely adjusted by rotating the ejector pin, and the reference position of the push rod can be adjusted by driving the tooth tube to move axially over a wide range through the shared tooth tube adjustment component. Both large and small dimensional errors can be quickly compensated. 6. Low operation and maintenance costs: Only one set of dental tube adjustment components is equipped with easily worn parts such as gears, bevel gears, and handwheels. The number of parts to be replaced due to wear and tear is small, and the maintenance workload is small. The guide rod sliding bushing reduces sliding wear and extends the service life of the entire dental tube adjustment component.

[0011] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural view of a specific embodiment of the present utility model; Figure 2 This is a side view of a specific embodiment of the present utility model.

[0013] Explanation of reference numerals in the attached drawings: 1. Fixed shaft; 2. Transmission swing arm; 3. Ejector pin; 4. Rear through ejector rod; 5. Push rod; 6. Threaded tube; 61. External transmission threaded part; 7. Threaded sleeve; 8. Adjusting gear; 9. Guide rod; 10. Swing seat; 101. Positioning slot; 11. Drive gear; 12. First bevel gear; 13. Drive shaft; 14. Second bevel gear; 15. Handwheel; 16. Positioning block; 20. Threaded tube adjustment assembly. Detailed Implementation

[0014] 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.

[0015] like Figure 1 , Figure 2 As shown, this embodiment discloses a fine-tuning mechanism for the stroke movement of the rear through-hole ejector rod of a cold heading machine, which includes a frame. Three sets of cold heading stations are arranged side by side along the horizontal direction on the frame. Each set of cold heading stations is independently equipped with a transmission swing arm 2, ejector pin 3, rear through-hole ejector rod 4, push rod 5, threaded tube 6, and threaded sleeve 7.

[0016] The bottom of the transmission swing arm 2 is hinged to the fixed shaft 1 of the frame and driven by the eccentric connecting rod of the cold heading machine. It can swing back and forth within a fixed angle. The upper end of the transmission swing arm 2 has an internal threaded hole, and the outer wall of the ejector pin 3 is machined with matching external threads. The ejector pin 3 is threadedly connected to the upper end of the transmission swing arm 2. Rotating the ejector pin 3 in the forward or reverse direction can change the forward extension length of the ejector pin 3, thereby adjusting the initial collision contact position between the front end of the ejector pin 3 and the rear end of the push rod 5, and realizing small-range stroke error compensation.

[0017] The rear push rod 4 passes through the cavity of the cold heading bottom mold, and the rear end face of the rear push rod 4 is in close contact with the front end of the push rod 5. The push rod 5 is slidably assembled in the inner hole of the threaded tube 6 along the axial direction. The inner hole of the threaded tube 6 and the push rod 5 are in clearance fit, allowing the push rod 5 to slide back and forth along the threaded tube 6, and restricting the radial offset and shaking of the push rod 5. The outer wall of the threaded tube 6 is integrally machined with an external transmission thread 61, and an adjusting gear 8 is fixedly installed at one end of the threaded tube 6.

[0018] The threaded sleeve 7 is fixedly installed at the corresponding work position on the machine frame. The threaded sleeve 7 has an internal thread. The internal thread of the threaded sleeve 7 is threadedly engaged with the external drive thread 61 of the threaded tube 6. When the threaded tube 6 rotates around its own axis, the threaded drive realizes the overall front-to-back axial extension and retraction of the threaded tube 6, which drives the push rod 5 to move synchronously and changes the reference initial position of the push rod 5.

[0019] A cylindrical guide rod 9 is horizontally fixed on the upper part of the frame, spanning all three cold heading stations. Limiting blocks are installed at both ends of the guide rod 9 to limit the lateral sliding range of the entire dental tube adjustment assembly 20 and prevent the dental tube adjustment assembly 20 from sliding out of the two ends of the guide rod 9. A single dental tube adjustment assembly 20 is slidably assembled on the outside of the guide rod 9. The entire dental tube adjustment assembly 20 is an independent assembly unit that can slide as a whole. The dental tube adjustment assembly 20 includes a swing seat 10, and a sliding bushing is embedded inside the swing seat 10. The sliding bushing is fitted on the outer wall of the guide rod 9, which greatly reduces the lateral sliding resistance of the entire dental tube adjustment assembly 20. The swing seat 10 can slide left and right along the guide rod 9 with the dental tube adjustment assembly 20, and at the same time, the swing seat 10 can swing up and down relative to the guide rod 9.

[0020] A drive gear 11 is rotatably mounted on the lower end of the swing seat 10. A first bevel gear 12 is coaxially fixed at the central end of the drive gear 11. A drive shaft 13 is vertically rotatably mounted inside the swing seat 10. A second bevel gear 14 is fixed at the lower end of the drive shaft 13. The second bevel gear 14 and the first bevel gear 12 are bevel gears of equal module, and they can fully mesh to transmit rotational power. The upper end of the drive shaft 13 extends upwards out of the top surface of the swing seat 10. A handwheel 15 is fixedly mounted on the top of the drive shaft 13. The handwheel 15, drive shaft 13, second bevel gear 14, drive gear 11, swing seat 10, sliding bushing, and swing locking bolt are all components of the tooth tube adjustment assembly 20. The operator can drive the drive shaft 13 to rotate synchronously by turning the handwheel 15.

[0021] A square positioning block 16 is welded and fixed on the frame for each cold heading station. A square positioning slot 101 is opened at the bottom of the swing seat 10. The inner contour of the positioning slot 101 is completely matched with the shape of the positioning block 16. When it is necessary to adjust the stroke of the top rod of a certain station, the operator holds the handwheel 15 and pushes the swing seat 10 on the entire set of tooth tube adjustment assembly 20 to slide along the guide rod 9 to the position above the corresponding positioning block 16 of the target station and then swings downward. The downward swing is achieved by manually pressing the swing seat 10 downward to make it swing down. The bottom positioning slot 101 is fully engaged and sleeved on the outside of the positioning block 16. After the engagement is completed, the swing seat 10 automatically maintains a horizontal and stable posture. At this time, the drive gear 11 at the lower end of the swing seat 10 is precisely aligned and fully engaged with the adjustment gear 8 at the end of the tooth tube 6 of the station. At the same time, the first bevel gear 12 and the second bevel gear 14 are engaged synchronously.

[0022] The swing seat 10 is threaded with a swing locking bolt on its side wall. This locking bolt is a locking component that matches the toothed tube adjustment assembly 20. After the positioning slot 101 engages with the positioning block 16, the swing locking bolt is tightened. The end of the bolt abuts against the outer wall of the guide rod 9, locking the swing angle of the swing seat 10. During the adjustment process, the swing seat 10 will not tilt upwards, and the gears will always remain engaged, preventing tooth slippage or other problems.

[0023] Adjusting the operating procedure Fine-tuning small-range stroke error: Rotate ejector pin 3 to change the extension length of ejector pin 3, adjust the initial contact gap between ejector pin 3 and push rod 5, and complete micro-dimensional compensation; Wide-range reference stroke adjustment: Slide the entire set of tooth tube adjustment components 20 laterally to the target position, lower the swing seat 10 so that the positioning slot 101 engages with the positioning block 16, tighten the swing locking bolt on the tooth tube adjustment components 20 to lock the swing seat 10; rotate the handwheel 15 clockwise or counterclockwise, the handwheel 15 drives the drive shaft 13 and the second bevel gear 14 to rotate synchronously, the second bevel gear 14 meshes with and drives the first bevel gear 12 and the drive gear 11 to rotate synchronously, the drive gear 11 meshes with and drives the adjustment gear 8 and the tooth tube 6 to rotate; the tooth tube 6 relies on the external transmission threaded part 61 to engage with the threaded sleeve 7 to extend and retract along its own axis, push the push rod 5 to move synchronously, change the overall initial position of the push rod 5, and finally adjust the ejection stroke of the push rod 4; After confirming the travel dimension is in place, loosen the swing locking bolt on the tooth tube adjustment assembly 20, lift the swing seat 10 upward to separate the drive gear 11 from the adjustment gear 8, and then slide the entire tooth tube adjustment assembly 20 laterally to the next station to repeat the adjustment operation. When the equipment is in normal production, the entire set of tooth tube adjustment components 20 can be slid to an idle position on the side of the equipment, without interfering with the cold heading operations of each station.

[0024] Equipment operation process: The eccentric connecting rod of the cold heading machine drives the transmission swing arm 2 to swing back and forth. The ejector pin 3 at the upper end of the transmission swing arm 2 periodically hits the rear end of the push rod 5. The push rod 5 pushes the rear push rod 4 forward and extends into the mold cavity of the cold heading bottom mold, pushing the formed workpiece outward to complete a single ejection operation. When changing to different specifications of bar stock, only one set of thread tube adjustment components 20 needs to be moved to adjust the stroke position by position, without the need for multiple independent adjustment mechanisms to be operated separately.

Claims

1. A fine-tuning mechanism for the stroke movement of a rear-through ejector rod of a cold heading machine, comprising a frame, wherein the frame is provided with several cold heading stations arranged side by side, each cold heading station comprising a transmission swing arm (2), an ejector pin (3), a rear-through ejector rod (4), a push rod (5), a threaded tube (6), and a threaded sleeve (7); the transmission swing arm (2) is hinged to the frame and driven to reciprocate by an eccentric connecting rod, the ejector pin (3) is threadedly connected to the upper end of the transmission swing arm (2); the rear-through ejector rod (4) is located inside the mold cavity of the cold heading bottom mold, the rear end of the rear-through ejector rod (4) abuts against the push rod (5), the push rod (5) is axially slidably fitted into the inner hole of the threaded tube (6), the outer wall of the threaded tube (6) is provided with an external transmission threaded part (61), the end of the threaded tube (6) is fixedly provided with an adjusting gear (8), and the threaded sleeve (7) is fixed to the frame and threadedly engaged with the external transmission threaded part (61) of the threaded tube (6); characterized in that: A guide rod (9) is horizontally placed above the frame. A tooth tube adjustment assembly (20) is slidably mounted on the guide rod (9). The tooth tube adjustment assembly (20) includes a swingable swing seat (10) slidably sleeved on the guide rod (9). A drive gear (11) is rotatably mounted on the lower end of the swing seat (10). A first bevel gear (12) is fixed at the central shaft end of the drive gear (11). A drive shaft (13) is vertically mounted on the swing seat (10). A second bevel gear (14) is fixed at the lower end of the drive shaft (13). The first bevel gear (12) and the second bevel gear (14) mesh and transmit power. A handwheel (15) is mounted on the upper end of the drive shaft (13). A device for cold heading is fixed on the frame. The positioning blocks (16) are one-to-one corresponding to the positioning blocks (16), and the bottom of the swing seat (10) has a positioning slot (101). The swing seat (10) slides along the guide rod (9) to the position above the corresponding positioning block (16) of the target station and then swings downward. The positioning slot (101) engages with the positioning block (16) for positioning. At this time, the drive gear (11) and the adjusting gear (8) mesh precisely. Turning the handwheel (15) can drive the tooth tube (6) to rotate in sequence through the drive shaft (13), the second bevel gear (14), the first bevel gear (12), and the adjusting gear (8). The tooth tube (6) extends and retracts axially relative to the threaded sleeve (7) to complete the adjustment of the initial position of the push rod (5) and the stroke of the rear through rod (4).

2. The fine-tuning mechanism for the stroke movement of the rear through-hole rod of the cold heading machine according to claim 1, characterized in that: The outer wall of the ejector pin (3) is provided with an external thread, and the upper end of the transmission swing arm (2) is provided with a matching internal thread hole. Rotating the ejector pin (3) can change the extension length of the ejector pin (3) and adjust the initial collision contact position between the ejector pin (3) and the push rod (5).

3. The fine-tuning mechanism for the stroke movement of the rear through-hole rod of the cold heading machine according to claim 1, characterized in that: A sliding bushing is provided between the swing seat (10) and the guide rod (9). The sliding bushing is in clearance fit with the guide rod (9) to reduce the lateral sliding resistance of the swing seat (10). The sliding bushing is integrated inside the dental tube adjustment assembly (20).

4. The fine-tuning mechanism for the stroke movement of the rear through-hole rod of the cold heading machine according to claim 1, characterized in that: The positioning slot (101) is a square groove that fits the shape of the positioning block (16). After the positioning slot (101) and the positioning block (16) are fully engaged, the swing seat (10) remains in a horizontal position, and the drive gear (11) and the adjusting gear (8) mesh without deviation.

5. The fine-tuning mechanism for the stroke movement of the rear through-hole rod of the cold heading machine according to claim 1, characterized in that: The guide rod (9) is provided with limit blocks at both ends. The limit blocks restrict the overall lateral sliding stroke of the tooth tube adjustment assembly (20) to prevent the swing seat (10) from sliding out of both ends of the guide rod (9).

6. The fine-tuning mechanism for the stroke movement of the rear through-hole rod of the cold heading machine according to claim 1, characterized in that: The first bevel gear (12) and the second bevel gear (14) are bevel gears with equal module, and the drive gear (11) and the adjusting gear (8) are both spur gears. All gear components are integrated into the tooth tube adjusting assembly (20) and the end of the tooth tube at the work station.

7. The fine-tuning mechanism for the stroke movement 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) and the push rod (5) are in a sliding fit, allowing the push rod (5) to move only along the axial direction of the tooth tube (6) and restricting the radial displacement of the push rod (5).

8. The fine-tuning mechanism for the stroke movement of the rear through-hole rod of the cold heading machine according to claim 1, characterized in that: The swing seat (10) is equipped with a swing locking bolt. After the swing seat (10) engages with the positioning block (16) at the bottom, the swing locking bolt is tightened to lock the swing angle of the swing seat (10) and prevent the gear from disengaging during the adjustment process.

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