Auxiliary mechanism for lifting clamp table of cold header

Abstract

The embodiment of the invention discloses an auxiliary mechanism for lifting a clamping table of a cold header. The auxiliary mechanism comprises a female die cavity, the clamping table, a jacking column, an inclined block and a bidirectional operation hydraulic cylinder. The clamp table is provided with a vertical hole penetrating through the upper surface and the lower surface and a square hole transversely extending inwards from the side face, and the square hole intersects with the vertical hole; the top column penetrates through the vertical hole in a sliding mode, and an upper inclined face is arranged on the top face of the top column. The inclined block is slidably arranged in the square hole, a lower inclined surface is arranged on the lower surface of the inclined block, and the lower inclined surface is slidably attached to the upper inclined surface; the two-way operation hydraulic cylinder is arranged on the side portion of the clamping table, and a piston rod of the hydraulic cylinder is connected with the inclined block. The inclined block is driven to transversely slide through the bidirectional operation hydraulic cylinder, transverse power is converted into vertical jacking force of the jacking column through adaptive attachment of the lower inclined face of the inclined block and the upper inclined face of the jacking column, the clamping table is jacked up, vacuum suction force between the clamping table and the female die cavity is eliminated, and at the moment, the lifting mechanism is started; and the instant force required by the rotary lifting of the clamping table is greatly reduced, so that the overload problem of the lifting mechanism is effectively avoided.

Description

Technical Field

[0001] This invention relates to the field of cold heading machine technology, specifically to an auxiliary mechanism for raising the clamping platform of a cold heading machine. Background Technology

[0002] In the production operation of cold heading machine, the clamping table is the core component for material clamping and transfer. It needs to rotate around the bearing hole axis of the ear plate. During normal production, the clamping table is in the lower limit position. At this time, the lower surface of the clamping table is in close contact with the upper surface of the die cavity, and the gap between the two is filled with cold heading oil.

[0003] When production malfunctions and a shutdown for inspection is required, the clamping platform needs to rotate to its upper limit position around the bearing hole axis. However, at the initial moment of rotation, because the lower surface of the clamping platform is tightly fitted with the upper surface of the die cavity, and the gap between them is filled with cold heading oil, air cannot quickly enter the gap. Under atmospheric pressure, this makes it difficult to separate the lower surface of the clamping platform from the upper surface of the die cavity. Therefore, the lifting mechanisms, such as the chain and reducer responsible for driving the rotation of the clamping platform, are frequently damaged due to overload. Summary of the Invention

[0004] Therefore, embodiments of the present invention provide an auxiliary mechanism for raising the clamping platform of a cold heading machine to solve one or more of the above-mentioned technical problems.

[0005] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0006] An auxiliary mechanism for raising the clamping platform of a cold heading machine includes a die cavity, a clamping platform, a top post, a wedge block, and a bidirectional hydraulic cylinder. When the clamping platform is in its lower limit position, its lower surface is in contact with the upper surface of the die cavity. The clamping platform has a vertical hole penetrating both the upper and lower surfaces and a square hole extending laterally inward from the side, the square hole intersecting the vertical hole. The top post is slidably inserted into the vertical hole, and its top surface has an upper inclined surface, the height of which gradually decreases along the clamping platform from the inside out. The wedge block is slidably disposed in the square hole, and its lower surface has a lower inclined surface adapted to the upper inclined surface, the lower inclined surface slidingly contacting the upper inclined surface. The bidirectional hydraulic cylinder is disposed on the side of the clamping platform, and its piston rod is connected to the wedge block.

[0007] Furthermore, the vertical hole includes a first vertical hole extending downward from the upper surface and a second vertical hole extending upward from the lower surface. The first vertical hole and the second vertical hole are coaxially arranged, and the diameter of the first vertical hole is larger than the diameter of the second vertical hole; the square hole intersects with the middle section of the first vertical hole.

[0008] Furthermore, the top column includes an upper top head and a lower top head integrally connected below the upper top head. The upper top head is slidably inserted in the first vertical hole, and the lower top head is slidably inserted in the second vertical hole. The upper inclined surface is disposed on the upper surface of the upper top head.

[0009] Furthermore, the upper top head is in clearance fit with the first vertical hole, and the lower top head is in clearance fit with the second vertical hole.

[0010] Furthermore, the auxiliary mechanism also includes a return spring, which is pre-compressed and sleeved on the lower top head, with its two ends abutting against the bottom of the first vertical hole and the lower end face of the upper top head, respectively.

[0011] Furthermore, the lower inclined surface of the inclined block and the upper inclined surface of the top column have the same inclination angle, with the inclination angle ranging from 15° to 30°.

[0012] Furthermore, both the top column and the inclined block are made of high-strength steel.

[0013] Furthermore, the cylinder body of the bidirectional hydraulic cylinder is fixedly connected to the side of the clamping platform via a flange.

[0014] Furthermore, the piston rod end of the bidirectional hydraulic cylinder is connected to the inclined block by a thread, and an anti-loosening nut is fitted at the connection part between the piston rod and the inclined block, with the anti-loosening nut tightly fitting against the side of the inclined block.

[0015] Furthermore, the width of the inclined block is adapted to the width of the square hole.

[0016] The embodiments of the present invention have the following advantages:

[0017] The lateral sliding of the inclined block is driven by a bidirectional hydraulic cylinder. The lower inclined surface of the inclined block and the upper inclined surface of the top column are matched and fitted to convert the lateral power into the vertical thrust of the top column. Under the action of this vertical thrust, the clamping platform is passively raised by a small displacement, creating a gap between the lower surface of the clamping platform and the upper surface of the cavity. This allows the oil film between the two to break and air to enter the gap. Then the lifting mechanism is activated. At this moment, because the vacuum suction between the two is eliminated, the instantaneous force required for the rotation and lifting of the clamping platform is greatly reduced, thus effectively avoiding the problem of damage to the lifting mechanism due to overload.

[0018] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of this application will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0019] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0020] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0021] Figure 1 A front view schematic diagram of an auxiliary mechanism for raising the clamping platform of a cold heading machine, provided in an embodiment of the present invention;

[0022] Figure 2 A side view of an auxiliary mechanism for raising the clamping platform of a cold heading machine, provided in an embodiment of the present invention;

[0023] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure of AA;

[0024] Figure 4 for Figure 3 A magnified view of a portion of the image;

[0025] Figure 5 A schematic diagram of the top column of an auxiliary mechanism for raising the clamping platform of a cold heading machine, provided in an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the inclined block of an auxiliary mechanism for raising the clamping platform of a cold heading machine, provided in an embodiment of the present invention.

[0027] In the diagram: 1. Die cavity; 2. Clamping platform; 21. Bearing hole; 3. Ejector pin; 31. Upper ejector head; 32. Lower ejector head; 33. Upper inclined surface; 4. Inclined block; 41. Lower inclined surface; 5. Two-way hydraulic cylinder; 6. Return spring. Detailed Implementation

[0028] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] like Figure 1-6 As shown, this embodiment provides an auxiliary mechanism for raising the clamping platform of a cold heading machine, including a die cavity 1, a clamping platform 2, a top column 3, a wedge block 4, and a bidirectional hydraulic cylinder 5; one end of the clamping platform 2 is provided with an ear plate having a bearing hole 21, and the clamping platform 2 can rotate about the axis of the bearing hole 21; when the clamping platform 2 is in the lower limit position, the lower surface of the clamping platform 2 is in contact with the upper surface of the die cavity 1; the clamping platform 2 is provided with a vertical hole penetrating the upper and lower surfaces and a horizontal hole extending from the side inward. An extended square hole intersects with a vertical hole; a top post 3 is slidably inserted into the vertical hole, and an upper inclined surface 33 is provided on the top surface of the top post 3, the height of which gradually decreases from the inside to the outside along the clamping platform 2; an inclined block 4 is slidably inserted into the square hole, and a lower inclined surface 41 that matches the upper inclined surface 33 is provided on the lower surface of the inclined block 4, the lower inclined surface 41 and the upper inclined surface 33 slidingly touching each other; a bidirectional hydraulic cylinder 5 is provided on the side of the clamping platform 2, and the piston rod of the hydraulic cylinder is connected to the inclined block 4.

[0030] It should be noted that the die cavity 1 is a component of the cold heading machine, with a relatively simple shape. Its function is to accommodate and support the die cavity. The clamping platform 2 is also a component of the cold heading machine. Driven by the lifting mechanism such as the chain and reducer, it rotates around the bearing hole 21.

[0031] It should be noted that the lower inclined surface 41 of the inclined block 4 is always in contact with the upper inclined surface 33 of the top column 3. This can be limited by the limit position of the piston rod of the bidirectional hydraulic cylinder 5. That is, when the piston rod is extended to the limit position (i.e., extended to the longest position) or retracted to the limit position (i.e., extended to the shortest position), the two inclined surfaces of the inclined block 4 and the top column 3 are always in contact.

[0032] It should be noted that the bidirectional hydraulic cylinder 5 can control the extension and retraction of the piston in the hydraulic cylinder via buttons and a reversing valve installed externally. This is existing technology and will not be described further.

[0033] When the equipment malfunctions and the clamping platform 2 needs to be rotated and raised, press the button to change the oil circuit state of the reversing valve. The bidirectional hydraulic cylinder 5 is filled with oil in the reverse direction. The piston rod drives the inclined block 4 to move from the outside to the inside. The inclined block 4 pushes the top column 3 to move downward. The lower end of the top column 3 contacts the upper surface of the die cavity 1 and generates pressure, thereby slightly raising the clamping platform 2 to a certain height and breaking the vacuum suction between the clamping platform 2 and the die cavity 1.

[0034] The lateral sliding of the inclined block 4 is driven by the bidirectional hydraulic cylinder 5. The lateral force is converted into the vertical pushing force of the top column 3 by the matching fit between the lower inclined surface 41 of the inclined block 4 and the upper inclined surface 33 of the top column 3. Under the action of this vertical pushing force, the clamping platform 2 is passively raised by a small displacement, creating a gap between the lower surface of the clamping platform 2 and the upper surface of the cavity 1. This allows the oil film between the two to break and air to enter the gap. Then the lifting mechanism is activated. At this time, since the vacuum suction between the two is eliminated, the instantaneous force required for the rotation and lifting of the clamping platform 2 is greatly reduced, thereby effectively avoiding the problem of damage to the lifting mechanism due to overload.

[0035] It should be noted that the mechanism consisting of the top column 3, the inclined block 4, and the bidirectional hydraulic cylinder 5 can be configured in multiple ways, allowing multiple mechanisms to operate simultaneously, thereby improving the efficiency of the clamping platform 2. For example... Figure 3 As shown, in this embodiment, two sets of this mechanism are set up, one on the left and one on the right.

[0036] In this embodiment, the vertical hole includes a first vertical hole extending downward from the upper surface and a second vertical hole extending upward from the lower surface. The first vertical hole and the second vertical hole are coaxially arranged, and the diameter of the first vertical hole is larger than the diameter of the second vertical hole; the square hole intersects with the middle section of the first vertical hole.

[0037] The vertical hole is split into a first vertical hole and a second vertical hole that are coaxial but have different diameters. The stepped structure of the first vertical hole and the second vertical hole can form a limiting step, which can constrain the maximum downward stroke of the top column 3 and prevent the top column 3 from moving too far downward. At the same time, it also provides a suitable space foundation for the subsequent installation of the return spring 6.

[0038] In this embodiment, the top column 3 includes an upper top head 31 and a lower top head 32 integrally connected below the upper top head 31. The upper top head 31 is slidably inserted in the first vertical hole, and the lower top head 32 is slidably inserted in the second vertical hole. The upper inclined surface 33 is provided on the upper surface of the upper top head 31.

[0039] The top column 3 adopts an integrated structure with the upper top head 31 and the lower top head 32, which can enhance the overall structural strength and rigidity of the top column 3, prevent the top column 3 from breaking or deforming when subjected to vertical thrust, and improve the load-bearing capacity and service life of the top column 3. At the same time, the upper top head 31 is adapted to slide through the first vertical hole, and the lower top head 32 is adapted to slide through the second vertical hole. Through the precise cooperation between the upper and lower top heads 32 and the corresponding vertical holes, the lifting trajectory of the top column 3 can be guided and constrained, preventing the top column 3 from deviating or shaking during the lifting process, ensuring that the top column 3 always moves along the vertical axis, thereby ensuring the positioning accuracy when the clamping platform 2 is raised, and avoiding the impact of the lifting position deviation of the clamping platform 2 on the processing accuracy due to the deviation of the top column 3.

[0040] In this embodiment, the upper top head 31 is clearance-fitted with the first vertical hole, and the lower top head 32 is clearance-fitted with the second vertical hole. It should be noted that the clearance range is 0.02-0.05 mm.

[0041] The upper mandrel 31 is fitted with the first vertical hole with a clearance fit, and the lower mandrel 32 is fitted with the second vertical hole with a clearance fit. The reasonable clearance setting can reduce the frictional resistance between the mandrel 3 and the wall of the vertical hole, reduce the energy loss when the mandrel 3 rises and falls, ensure smoother sliding of the mandrel 3, and avoid jamming problems. On the other hand, the small clearance allows the mandrel 3 to adapt to the small vibrations in the processing process within a certain range, while effectively constraining the movement direction of the mandrel 3 to prevent excessive deviation of the mandrel 3. It takes into account both the smoothness of the sliding of the mandrel 3 and the accuracy of the positioning, and ensures the stable operation of the auxiliary mechanism.

[0042] In this embodiment, the auxiliary mechanism also includes a return spring 6, which is pre-compressed and sleeved on the lower ejector head 32, with its two ends abutting the bottom of the first vertical hole and the lower end face of the upper ejector head 31, respectively. When the piston rod retracts to its limit position, under the action of the return spring 6, the ejector pin 3 is located at the upper limit position, and the lower end of the ejector pin 3 does not contact the upper surface of the die cavity 1.

[0043] The pre-compression state allows the spring to always apply an upward elastic force to the top column 3. When the bidirectional hydraulic cylinder 5 drives the inclined block 4 to retract, it can quickly drive the top column 3 to reset. At the same time, the elastic force of the spring can help the top column 3 and the inclined surface of the inclined block 4 to always keep in close contact, ensuring the stability and reliability of power transmission.

[0044] In this embodiment, the lower inclined surface 41 of the inclined block 4 and the upper inclined surface 33 of the top column 3 have the same inclination angle, and the inclination angle range is 15°-30°.

[0045] A consistent tilt angle ensures that the two inclined surfaces fit together perfectly, avoiding localized stress concentration caused by angle deviation, reducing wear on the inclined surfaces, and extending their service life. The tilt angle range of 15°-30° has been optimized to ensure that the lateral thrust of the hydraulic cylinder is efficiently converted into the vertical thrust of the top column 3 (too small an angle will result in low power conversion efficiency, while too large an angle will easily cause the inclined surfaces to slip), and to prevent the lifting speed of the top column 3 from being too fast or too slow, thus achieving a balance between the lifting speed and force of the top column 3. This adapts to the actual power requirements of the cold heading machine's clamping platform 2, ensuring that the clamping platform 2 is lifted smoothly and efficiently.

[0046] In this embodiment, both the top column 3 and the inclined block 4 are made of high-strength steel.

[0047] The top column 3 and the inclined block 4 are made of high-strength steel. High-strength steel has excellent tensile strength, compressive strength and wear resistance, which makes the top column 3 less prone to plastic deformation or fracture when subjected to large thrust transmitted by the hydraulic cylinder, ensuring the structural stability and load-bearing capacity of the top column 3. At the same time, when the inclined block 4 slides and rubs against the inclined surface of the top column 3 for a long time and is subjected to the lateral thrust of the hydraulic cylinder, the high wear resistance of the high-strength steel can reduce the amount of wear on the inclined surface, avoid problems such as increased fit clearance and decreased power transmission efficiency caused by the wear of the inclined surface, significantly extend the service life of the top column 3 and the inclined block 4, reduce the maintenance and replacement frequency and cost of the auxiliary mechanism, and adapt to the long-term continuous production operation requirements of the cold heading machine.

[0048] In this embodiment, the cylinder body of the bidirectional hydraulic cylinder 5 is fixedly connected to the side of the clamping platform 2 via a flange.

[0049] Compared to traditional bolt connections, flange connections increase the contact area between the hydraulic cylinder and the clamping platform 2, dispersing the vibration and stress generated during hydraulic cylinder operation. This prevents cracking or deformation on the side of the clamping platform 2 due to localized stress concentration, thus improving the stability and reliability of the connection structure. Furthermore, flange connections facilitate the installation and disassembly of the hydraulic cylinder. Subsequent inspection, maintenance, or replacement of the hydraulic cylinder does not require significant modifications to the main structure of the clamping platform 2, reducing maintenance difficulty and improving maintenance efficiency.

[0050] In this embodiment, the piston rod end of the bidirectional hydraulic cylinder 5 is connected to the inclined block 4 by a thread, and an anti-loosening nut is fitted at the connection part of the piston rod and the inclined block 4, and the anti-loosening nut fits tightly against the side of the inclined block 4.

[0051] The threaded connection has the advantages of simple structure, reliable connection and easy disassembly. It is convenient to adjust the connection length between the piston rod and the inclined block 4 according to actual needs, or to replace the inclined block 4 and the piston rod separately. The anti-loosening nut can effectively prevent the threaded connection from loosening due to vibration when the hydraulic cylinder is working, ensuring that the piston rod and the inclined block 4 always remain firmly connected, avoiding interruption or lag in power transmission due to loose connection, ensuring the stability and continuity of power transmission of the auxiliary mechanism, and thus ensuring the reliable execution of the lifting action of the clamping platform 2.

[0052] In this embodiment, the width of the wedge block 4 is adapted to the width of the square hole.

[0053] The width of the inclined block 4 is matched with the width of the square hole, which enables the inclined block 4 to slide laterally in the square hole. The sliding trajectory of the inclined block 4 is precisely guided, preventing the inclined block 4 from shifting left or right or shaking during the sliding process. This ensures that the inclined block 4 always moves along the axis of the square hole, thereby ensuring the fitting accuracy between the lower inclined surface 41 of the inclined block 4 and the upper inclined surface 33 of the top column 3, and avoiding poor contact of the inclined surfaces due to the offset of the inclined block 4.

[0054] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. An auxiliary mechanism for raising a clamping platform (2) of a cold heading machine, comprising a die cavity (1) and a clamping platform (2), wherein when the clamping platform (2) is in its lower limit position, the lower surface of the clamping platform (2) is in contact with the upper surface of the die cavity (1); characterized in that, The auxiliary mechanism also includes a top column (3), an inclined block (4), and a bidirectional hydraulic cylinder (5); the clamping platform (2) is provided with a vertical hole penetrating the upper and lower surfaces and a square hole extending laterally from the side, the square hole intersecting with the vertical hole; the top column (3) is slidably inserted in the vertical hole, the top surface of the top column (3) is provided with an upper inclined surface (33), the height of the upper inclined surface (33) gradually decreases along the clamping platform (2) from the inside to the outside; the inclined block (4) is slidably disposed in the square hole, the lower surface of the inclined block (4) is provided with a lower inclined surface (41) adapted to the upper inclined surface (33), the lower inclined surface (41) slidingly abutting the upper inclined surface (33); the bidirectional hydraulic cylinder (5) is disposed on the side of the clamping platform (2), the piston rod of the hydraulic cylinder is connected to the inclined block (4).

2. The auxiliary mechanism for raising the cold heading machine clamping platform (2) as described in claim 1, characterized in that, The vertical hole includes a first vertical hole extending downward from the upper surface and a second vertical hole extending upward from the lower surface. The first vertical hole and the second vertical hole are coaxially arranged, and the diameter of the first vertical hole is larger than the diameter of the second vertical hole. The square hole intersects with the middle section of the first vertical hole.

3. The auxiliary mechanism for raising the cold heading machine clamping platform (2) as described in claim 2, characterized in that, The top post (3) includes an upper top head (31) and a lower top head (32) integrally connected below the upper top head (31). The upper top head (31) is slidably inserted in the first vertical hole, and the lower top head (32) is slidably inserted in the second vertical hole. The upper inclined surface (33) is provided on the upper surface of the upper top head (31).

4. The auxiliary mechanism for raising the cold heading machine clamping platform (2) as described in claim 3, characterized in that, The upper top head (31) is in clearance fit with the first vertical hole, and the lower top head (32) is in clearance fit with the second vertical hole.

5. The auxiliary mechanism for raising the cold heading machine clamping platform (2) as described in claim 3, characterized in that, The auxiliary mechanism also includes a return spring (6), which is pre-compressed and sleeved outside the lower top head (32), with its two ends abutting the bottom of the first vertical hole and the lower end face of the upper top head (31), respectively.

6. The auxiliary mechanism for raising the cold heading machine clamping platform (2) as described in claim 1, characterized in that, The lower inclined surface (41) of the inclined block (4) and the upper inclined surface (33) of the top column (3) have the same inclination angle, and the inclination angle ranges from 15° to 30°.

7. The auxiliary mechanism for raising the cold heading machine clamping platform (2) as described in claim 1, characterized in that, Both the top column (3) and the inclined block (4) are made of high-strength steel.

8. The auxiliary mechanism for raising the cold heading machine clamping platform (2) as described in claim 1, characterized in that, The cylinder body of the bidirectional hydraulic cylinder (5) is fixedly connected to the side of the clamping platform (2) via a flange.

9. The auxiliary mechanism for raising the clamping platform (2) of the cold heading machine as described in claim 1, characterized in that, The piston rod end of the bidirectional hydraulic cylinder (5) is connected to the inclined block (4) by a thread, and the connection part of the piston rod and the inclined block (4) is fitted with an anti-loosening nut, which fits tightly against the side of the inclined block (4).

10. The auxiliary mechanism for raising the cold heading machine clamping platform (2) as described in claim 1, characterized in that, The width of the inclined block (4) is adapted to the width of the square hole.

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