A punch press die adjustment structure

Abstract

This invention belongs to the field of punch press technology, and particularly relates to a punch press die adjustment structure, including an upper die base, a connecting rod, and an adjustment connecting device; the adjustment connecting device includes a connecting seat, an adjusting nut sleeve, a locking nut sleeve, and a limiting sleeve; the upper die base is provided with a downwardly recessed mounting cavity, the connecting seat is located in the mounting cavity, and the connecting seat has a connecting cavity; the lower end of the connecting rod is provided with an external thread and extends into the connecting cavity, the adjusting nut sleeve and the locking nut are sequentially sleeved on the lower end of the connecting rod, and are provided with internal threads that mesh with the external thread; the bottom of the locking nut sleeve and the bottom of the connecting cavity form a sealed oil cavity, the oil cavity being connected to a hydraulic system; both the adjusting nut sleeve and the locking nut sleeve are provided with a transmission connection part for connecting a drive mechanism, the drive mechanism being used to drive the adjusting nut sleeve and the locking nut sleeve to rotate; the limiting sleeve is provided on the connecting seat for limiting the adjusting nut sleeve and the locking nut sleeve within the connecting cavity; the oil cavity is filled with hydraulic oil, and the adjusting nut abuts against the bottom side of the limiting sleeve.

Description

Technical Field

[0001] This invention belongs to the field of punch press die adjustment technology, and particularly relates to a punch press die adjustment structure. Background Technology

[0002] A punch press is a common machining equipment in the field of mechanical processing. It drives the upper die to move up and down, closing with the lower die to process raw materials into specific products. Different products require different die heights, so after the upper die is installed on the bottom side of the upper die holder, the height of the lower dead center of the upper die needs to be adjusted. Furthermore, fine-tuning of the upper die height is required during product processing and debugging. Therefore, adjustment devices need to be installed on each punch press. Currently, the most common adjustment device uses a nut and screw combination. Specifically, rotating the nut causes the screw to move up and down.

[0003] Chinese patent document CN214927308U discloses a high-speed punch press with a mold-locking structure. Specifically, the high-speed punch press with a mold-locking structure includes a punch head, a worktable disposed at the lower part of the punch head, and a slider slidably mounted on the punch head. The slider is located above the worktable. An upper mold assembly is mounted at the lower part of the slider, and a lower mold assembly is mounted at the top of the worktable. The upper and lower mold assemblies are arranged vertically opposite each other. The punch head is characterized by having a crankshaft drive mechanism and multiple sets of slider connecting rod assemblies for lifting the slider. Each slider connecting rod assembly is provided with a guide post mounting plate fixedly mounted on the slider and a guide post fixedly mounted on the guide post. The connecting rod guide post of the mounting plate has an upper inner cavity and a lower inner cavity connected to the upper inner cavity in the middle. The upper inner cavity is equipped with a height adjustment screw, and the lower inner cavity is equipped with a guide post piston. The upper part of the height adjustment screw is connected to the crankshaft drive mechanism via a connecting rod drive. The outer wall of the height adjustment screw is threadedly engaged with the upper inner cavity of the connecting rod guide post. The upper part of the guide post piston is fixedly connected to the lower part of the height adjustment screw, and the lower part is fixedly installed on the guide post mounting plate to seal the lower inner cavity of the connecting rod guide post. The mold locking structure includes an oil inlet hole formed on one side of the guide post mounting plate and an oil inlet channel formed on the lower part of the connecting rod guide post. One end of the oil inlet channel is connected to the lower inner cavity of the connecting rod guide post, and the other end is connected to the oil inlet hole. The die height of the punch press is adjusted by adjusting the screw and connecting rod guide post threaded connection. After the die height is adjusted, high-pressure hydraulic oil is injected into the oil inlet. The high-pressure hydraulic oil fills the lower inner cavity of the connecting rod guide post through the oil inlet channel, tightening the gap between the screw and the connecting rod guide post thread, ensuring the precise and stable operation of the punch press, reducing equipment wear. At the same time, when unmolding, only the high-pressure oil in the lower inner cavity needs to be squeezed out, without the need to disassemble other parts, reducing equipment maintenance costs.

[0004] In the technical solution disclosed in the aforementioned patent documents, the outer wall of the height-adjusting screw is threadedly engaged with the upper inner cavity of the connecting rod guide post; the connecting rod guide post is fixedly installed on the guide post mounting plate, which is connected to the slider, and the upper end of the height-adjusting screw is connected to the crankshaft drive mechanism. Therefore, when rotating the connecting rod guide post, the height of the slider can be adjusted by the threaded engagement between the outer wall of the height-adjusting screw and the upper inner cavity of the connecting rod guide post, thereby adjusting the height of the upper die. Due to the clearance fit between the internal threads of the height-adjusting screw and the connecting rod guide post, there is a certain amount of play between them. Therefore, when hydraulic oil is added into the cavity to lock the die, the height-adjusting screw and the connecting rod guide post will undergo a certain displacement, which will change the height of the upper die and affect the stamping accuracy. In addition, during the stamping process, the force on the upper die will directly act on the hydraulic oil in the cavity, causing the hydraulic pressure to be squeezed. When the stamping force is large enough (greater than the oil pressure in the cavity), the height-adjusting screw and the connecting guide post will be misaligned, affecting the stamping accuracy. Furthermore, with the increase in the number of stamping cycles, the fluidity of the hydraulic oil in the mold increases, which can cause leakage from the thread seams. Summary of the Invention

[0005] The purpose of this invention is to provide a die adjustment structure for a punch press, which solves the problem that existing methods of adjusting the height of the upper die with nuts and screws and locking the nuts and screws with hydraulic pressure can cause the nuts and screws to become misaligned during punching, and may even cause the hydraulic oil to overflow.

[0006] To achieve the above objectives, an embodiment of the present invention provides a punch press die adjustment structure, including an upper die base, a connecting rod, and an adjustment connecting device. The adjustment connecting device connects the upper die base and the lower end of the connecting rod. The adjustment connecting device includes a connecting seat, an adjusting nut sleeve, a locking nut sleeve, and a limiting sleeve. The upper die base is provided with a downwardly recessed mounting cavity, and the connecting seat is disposed in the mounting cavity, having a connecting cavity. The lower end of the connecting rod is provided with an external thread that extends into the connecting cavity. The adjusting nut sleeve and the locking nut are sequentially sleeved on the lower end of the connecting rod and are provided with internal threads that mesh with the external thread. The bottom of the locking nut sleeve and the bottom of the connecting cavity form a sealed oil chamber. The oil chamber is connected to a hydraulic system, which supplies hydraulic oil to the oil chamber, causing the locking nut sleeve to rise and lock the connecting rod with the adjusting nut sleeve. Both the adjusting nut sleeve and the locking nut sleeve are provided with a transmission connection part for connecting to a drive mechanism. The drive mechanism is used to drive the adjusting nut sleeve and the locking nut sleeve to rotate. A limit sleeve is provided on the connecting seat to limit the adjusting nut sleeve and the locking nut sleeve in the connecting cavity. The oil chamber is filled with hydraulic oil, and the adjusting nut abuts against the bottom side of the limit sleeve.

[0007] Furthermore, the limiting sleeve extends upward to form a positioning sleeve, and the connecting rod is positioned within the positioning sleeve.

[0008] Furthermore, the tooth groove width of the internal thread of the adjusting nut sleeve and the locking nut sleeve is greater than the tooth width of the external thread, so that the internal thread of the adjusting nut sleeve and the locking nut sleeve are in clearance fit with the external thread.

[0009] Furthermore, the tooth surface of the internal thread of the adjusting nut sleeve is an arc-shaped surface.

[0010] Furthermore, the upper end of the connecting seat is provided with a clearance notch to allow the transmission connection part to connect to the drive mechanism; the transmission connection part is a cylindrical gear; the drive mechanism includes a motor and a drive gear, the drive gear meshes with the cylindrical spur gears of the adjusting nut sleeve and the locking nut sleeve, so that the drive mechanism simultaneously drives the adjusting nut sleeve and the locking nut sleeve to rotate.

[0011] Furthermore, there are three sets of connecting rods, each connected to an adjustment connecting device, and two adjacent adjustment connecting devices are connected to the same drive mechanism.

[0012] Furthermore, the bottom end of the connecting rod is provided with a mounting hole, and a displacement sensor is installed in the mounting hole. The displacement sensor is used to detect the distance between the bottom end of the connecting rod and the bottom end of the locking nut sleeve.

[0013] Furthermore, when the drive mechanism rotates the adjusting nut sleeve to adjust the distance between the bottom end of the connecting rod and the bottom end of the locking nut sleeve, the displacement sensor monitors in real time, enabling the drive mechanism to accurately control the adjustment of the connecting device; when the punch press is stamping, the displacement sensor monitors in real time the distance between the bottom end of the connecting rod and the bottom side of the locking nut sleeve, enabling the drive mechanism to drive the adjustment connecting device in real time.

[0014] Furthermore, the locking nut sleeve includes a nut sleeve, a sealing base plate, and a sealing ring. The sealing base plate is locked at the bottom end of the nut sleeve. The bottom end of the nut sleeve is provided with a step position, and the sealing ring is sleeved on the step position. The sealing base plate limits the sealing ring. The distance between the sealing base plate and the bottom wall of the connecting cavity is 1mm-3mm.

[0015] Furthermore, a positioning groove is provided on the bottom wall of the mounting cavity, and the bottom end of the connecting seat is located in the positioning groove; an oil groove is also provided on the bottom side of the connecting seat, and the oil groove and the bottom wall of the positioning groove form a sealing oil groove; the connecting seat is also provided with a through hole, which connects the sealing oil groove and the oil cavity, so that the pressure of the sealing oil groove and the oil cavity is the same.

[0016] The above-mentioned technical solutions in the punching die adjustment structure provided in the embodiments of the present invention have at least the following technical effects:

[0017] 1. When adjusting the height of the upper mold base, the hydraulic system can release the oil pressure in the oil chamber, freeing the locking nut. The drive mechanism can then drive the transmission connection, rotating the adjusting nut sleeve and the locking nut sleeve. With the adjusting nut sleeve engaging with the external thread of the connecting rod, the relative position of the connecting rod and the adjusting nut sleeve can be adjusted, thus adjusting the height of the upper mold base. After adjustment, the hydraulic system injects hydraulic oil into the oil chamber, causing the locking nut sleeve to move slightly upwards. The upper tooth surface of the internal thread of the locking nut sleeve is in close contact with the lower tooth surface of the external thread; therefore, the connecting rod can be locked in place by the locking nut. Due to the weight of the upper mold base, the contact surfaces between the adjusting nut sleeve and the connecting rod are the lower tooth surface of the internal thread and the upper tooth surface of the external thread, respectively. Therefore, when the locking nut sleeve moves upwards, it will not push the connecting rod upwards, ensuring the accuracy of the upper mold base after adjustment.

[0018] 2. During the stamping process, the force on the upper die holder will interact with the connecting rod and the hydraulic oil in the compression oil chamber of the locking nut sleeve. When the hydraulic oil is subjected to force, it will react on the bottom side of the locking nut sleeve, causing the locking nut sleeve to move upward. The upper tooth surface of the internal thread and the lower tooth surface of the external thread of the locking nut sleeve can avoid the problem of misalignment between the two and ensure stamping accuracy.

[0019] 3. The oil chamber is formed by the bottom side of the locking nut sleeve and the bottom wall of the connecting cavity. Therefore, when the hydraulic oil in the oil chamber is pressurized, there is no problem of overflowing from the thread gap, which can ensure that the locking nut sleeve is driven to lock the connecting rod by hydraulic pressure. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a structural diagram of the punch press die adjustment structure provided in an embodiment of the present invention.

[0022] Figure 2 This is a cross-sectional view of the punching die adjustment structure provided in an embodiment of the present invention.

[0023] Figure 3 for Figure 2 An enlarged view of part A.

[0024] Figure 4 for Figure 2 An enlarged view of part B.

[0025] Figure 5This is a cross-sectional view of the adjustment connection device of the punch press die adjustment structure provided in an embodiment of the present invention.

[0026] Figure 6 This is a structural diagram of the upper die holder of the punch press die adjustment structure provided in an embodiment of the present invention.

[0027] Figure 7 This is a structural diagram of the connecting rod of the punch press die adjustment structure provided in an embodiment of the present invention. Detailed Implementation

[0028] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0029] In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of the present invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] In the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention according to the specific circumstances.

[0032] In one embodiment of the die adjustment structure for the punch press of the present invention, please refer to... Figure 1The punch press die adjustment structure of this embodiment is installed on the punch press. Specifically, it includes an upper die holder 100, a connecting rod 200, and an adjustment connecting device 300. The connecting rod 200 is connected to the crankshaft of the punch press, and the adjustment connecting device 300 connects the upper die holder 100 and the lower end of the connecting rod 200. The adjustment connecting device 300 is used to adjust the height of the upper die holder 100, thereby adjusting the height of the upper die installed on the bottom side of the upper die holder 100.

[0033] Reference Figures 2 to 7 The adjusting connecting device 300 includes a connecting seat 310, an adjusting nut sleeve 320, a locking nut sleeve 330, and a limiting sleeve 340. The upper mold base 100 has a downwardly recessed mounting cavity 101. The connecting seat 310 is located within the mounting cavity 101 and has a connecting cavity 311. The lower end of the connecting rod 200 has an external thread 201, and the lower end of the connecting rod 200 extends into the connecting cavity 311. The adjusting nut sleeve 320 and the locking nut 330 are sequentially fitted onto the lower end of the connecting rod 200; and the adjusting nut sleeve 320 and the locking nut 330 have internal threads that mesh with the external thread 201. To facilitate the connection between the adjusting nut sleeve 320 and the locking nut sleeve 330 and the external thread 201 of the connecting rod 200, an oil positioning pin 321 is provided at the bottom end of the adjusting nut sleeve 320, while the locking nut sleeve 330 has a positioning hole 331 that slides with the positioning pin 321. Therefore, with the cooperation of the positioning pin 321 and the positioning hole 331, the locking nut sleeve 330 is allowed to move up and down, while the adjusting nut sleeve 320 and the locking nut sleeve 330 are connected as one unit. The bottom of the locking nut sleeve 330 has a bottom surface, which forms a sealed oil cavity 332 with the bottom of the connecting cavity 311. The oil cavity 332 is connected to a hydraulic system, which supplies hydraulic oil to the oil cavity, causing the locking nut sleeve 330 to rise and lock the connecting rod 200 with the adjusting nut sleeve 320. Both the adjusting nut sleeve 320 and the locking nut sleeve 330 are provided with transmission connecting parts 301 and 302 for connecting a drive mechanism (not shown in the figure). The drive mechanism is used to drive the adjusting nut sleeve 320 and the locking nut sleeve 320 to rotate. The limiting sleeve 340 is provided on the connecting seat 310 to limit the adjusting nut sleeve 320 and the locking nut sleeve 330 within the connecting cavity 311. After the hydraulic system fills the oil chamber 332 with hydraulic oil, the adjusting nut 320 will abut against the bottom side of the limiting sleeve 340. Specifically, a limiting ring 341 extends from the bottom side of the limiting sleeve 340, and the limiting ring 341 limits the adjusting nut 320 to the top side.

[0034] In this embodiment, when the height of the upper mold base 100 needs to be adjusted, the oil pressure in the oil chamber 332 can be released through the hydraulic system, allowing the locking nut 330 to be in a free state, so that both the adjusting nut sleeve 320 and the locking nut sleeve 330 can rotate. Therefore, the transmission connection parts 301 and 302 can be driven by the drive mechanism to rotate the adjusting nut sleeve 320 and the locking nut sleeve 330. With the adjustment nut sleeve 320 engaging with the external thread 201 of the connecting rod 200, the relative position of the connecting rod 200 and the adjusting nut sleeve 320 can be adjusted, thereby adjusting the height of the upper mold base 100. After the adjustment is completed, the hydraulic system injects hydraulic oil into the oil chamber 332, causing the locking nut sleeve 330 to move slightly upward, and the upper tooth surface of the internal thread of the locking nut sleeve 330 to be in close contact with the lower tooth surface of the tooth of the external thread 201; under the combined action of the adjusting nut 320, the connecting rod 200 can be locked and fixed. Specifically, due to the gravity of the upper die holder 100, the contact surfaces of the adjusting nut sleeve 320 and the connecting rod 200 are the lower tooth surface of the internal thread and the upper tooth surface of the external thread 201, respectively. Therefore, when the locking nut sleeve 330 moves upward, it will not push the connecting rod 200 upward, ensuring that the adjusting nut 320 and the connecting rod 200 remain fixed after adjustment, thus ensuring the accuracy of the upper die holder 100 after adjustment. During the stamping process, the force on the upper die holder 100 will interact with the hydraulic oil in the compression oil chamber 332 of the connecting rod 200 and the locking nut sleeve 330. When the hydraulic oil is subjected to force, it will react on the bottom side of the locking nut sleeve 330, causing the locking nut sleeve 330 to move upward. The upper tooth surface of the internal thread of the locking nut sleeve 330 and the lower tooth surface of the external thread 201 prevent misalignment and ensure stamping accuracy. In addition, the oil chamber 332 is formed by the bottom side of the locking nut sleeve 320 and the bottom wall of the connecting cavity 311. Therefore, when the hydraulic oil in the oil chamber 332 is pressurized, there is no problem of overflow from the thread gap, which can ensure that the locking nut sleeve 330 is driven by oil pressure to lock the connecting rod 200.

[0035] Furthermore, to reduce the pressure transmitted to the hydraulic oil in the oil chamber 332 during the stamping process, which causes a sudden increase in pressure within the oil chamber 332 and thus increases the force exerted by the locking nut sleeve 330 on the external thread 201, please refer to [the relevant documentation]. Figure 3 and Figure 5In this embodiment, a positioning groove 102 is provided on the bottom wall of the mounting cavity 101, and the bottom end of the connecting seat 310 is located in the positioning groove 102. Therefore, the positioning groove 102 can achieve the effect of positioning and sealing the connecting seat 310. An oil groove 313 is also provided on the bottom side of the connecting seat 310, and the oil groove 313 and the bottom wall of the positioning groove 102 form a sealing oil groove. The connecting seat 310 is also provided with a through hole 314, which connects the sealing oil groove and the oil cavity 332, so that the pressure in the sealing oil groove and the oil cavity 332 is the same. In this embodiment, at the moment of punching, the hydraulic oil in the oil chamber 332 is subjected to impact force. Since the oil groove 313 and the oil chamber 332 are connected, part of the impact force is applied to the bottom of the connecting seat 310, forming an upward lifting force on the connecting seat 310. This allows the bottom of the connecting seat 310 to bear half of the impact force of the hydraulic oil, thus preventing the pressure on the hydraulic oil in the oil chamber 332 from being entirely transferred to the locking nut sleeve 330. This reduces the impact force on the locking nut sleeve 330 and avoids problems such as deformation of the connecting threads.

[0036] Furthermore, referring to Figure 2 and Figure 3 To enhance the positioning and guiding of the connecting rod 200, the limiting sleeve 340 extends upward to form a positioning sleeve 342, through which the connecting rod 200 is positioned and passes. Specifically, by positioning the connecting rod 200 using the positioning sleeve 342, misalignment of the connecting rod 200 can be avoided when adjusting the relative height between the connecting rod 200 and the upper mold base 100.

[0037] Furthermore, refer to Figure 4 The tooth groove width of the internal threads of the adjusting nut sleeve 320 and the locking nut sleeve 330 is greater than the tooth width of the external thread 201, so that the internal threads of the adjusting nut sleeve 320 and the locking nut sleeve 330 are in clearance fit with the external thread 201. In this embodiment, after the pressure is released from the oil chamber 332, because the internal thread and the external thread 201 are in clearance fit, the adjusting nut sleeve 320 and the locking nut sleeve 330 can be rotated smoothly, reducing the driving force for adjustment, making the adjustment smoother, and reducing wear caused by mutual friction of the threads.

[0038] Furthermore, the tooth surface of the internal thread of the adjusting nut sleeve 320 is an arc-shaped surface. In this embodiment, since the tooth surface of the adjusting nut sleeve 320 has an arc-shaped structure, the contact area between the internal thread of the adjusting nut sleeve 320 and the external thread of the connecting rod 200 is reduced, thereby reducing friction and making the adjustment smoother.

[0039] Furthermore, refer to Figure 3The upper end of the connecting seat 310 is provided with a clearance notch to allow the transmission connecting parts 301 and 302 to connect to the drive mechanism; the transmission connecting parts 301 and 302 are cylindrical gears. The drive mechanism includes a motor and a drive gear. The drive gear meshes with the cylindrical spur gears of the adjusting nut sleeve 320 and the locking nut sleeve 330, so that the drive mechanism simultaneously drives the adjusting nut sleeve 320 and the locking nut sleeve 330 to rotate.

[0040] Furthermore, refer to 1 and Figure 2 There are three sets of connecting rods 200, each connected to an adjusting connecting device 300. Adjacent adjusting connecting devices 300 are connected to the same drive mechanism. In this embodiment, the three sets of adjusting connecting devices 300 can be linked together to simultaneously adjust the corresponding connecting rods 200, avoiding misalignment and jamming caused by asynchronous adjustments.

[0041] Furthermore, refer to Figure 2 and Figure 3 The bottom end of the connecting rod 200 is also provided with a mounting hole 202, and a displacement sensor 210 is installed in the mounting hole 202. The displacement sensor 210 is used to detect the distance between the bottom end of the connecting rod 200 and the bottom end of the locking nut sleeve 330. The displacement sensor 201 can detect the adjustment dimension of the connecting rod 200, thereby realizing automatic identification and control of the adjustment amount. Specifically, the displacement sensor 201 transmits the detected data to the control system, which controls the drive mechanism, thereby controlling the adjustment amount of the connecting rod 200.

[0042] Specifically, when the drive mechanism rotates the adjusting nut sleeve 320 to adjust the distance between the bottom end of the connecting rod 200 and the bottom end of the locking nut sleeve 330, the displacement sensor 210 monitors in real time, enabling the drive mechanism to accurately control the adjustment of the connecting device 300. Furthermore, during stamping, the displacement sensor 210 can monitor the distance between the bottom end of the connecting rod 200 and the bottom side of the locking nut sleeve 330 in real time. If a deviation occurs in the distance, the control system will control the drive mechanism to drive the adjusting connecting device 300 in real time, ensuring that the positional changes of the connecting rod 200 and the upper die holder 100 are monitored at any time during the stamping process, and adjustments are made accordingly to ensure the bottom dead center height of the lower die and ensure machining accuracy.

[0043] Furthermore, refer to Figure 2 , Figure 3 and Figure 5The locking nut sleeve 330 includes a nut sleeve 333, a sealing base plate 334, and a sealing ring 335. The sealing base plate 334 is locked to the bottom end of the nut sleeve 333; a step 336 is provided at the bottom end of the nut sleeve 333, and the sealing ring 335 is fitted onto the step 336, with the sealing base plate 334 limiting the sealing ring 335. The distance between the sealing base plate 334 and the bottom wall of the connecting cavity 311 is 1mm-3mm. In this embodiment, the locking nut sleeve 330 can form a piston within the connecting cavity 311. Because the depth of the oil cavity 332 is 1mm-3mm, the amount of hydraulic oil filling the oil cavity 332 is small, and even if oil overflow occurs, it will not cause a large amount of hydraulic oil to spill out.

[0044] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A punch press die adjustment structure, comprising an upper die base, a connecting rod, and an adjustment connecting device, wherein the adjustment connecting device connects the upper die base and the lower end of the connecting rod; characterized in that, The adjusting connection device includes a connecting seat, an adjusting nut sleeve, a locking nut sleeve, and a limiting sleeve; the upper mold base is provided with a downwardly recessed mounting cavity, the connecting seat is disposed in the mounting cavity, and the connecting seat has a connecting cavity; the lower end of the connecting rod is provided with an external thread and extends into the connecting cavity; the adjusting nut sleeve and the locking nut sleeve are sequentially fitted onto the lower end of the connecting rod and are provided with internal threads that mesh with the external thread; the bottom of the locking nut sleeve and the bottom of the connecting cavity form a sealed oil cavity, and the oil cavity is connected to a hydraulic system. The hydraulic system supplies hydraulic oil to the oil chamber, causing the locking nut sleeve to rise and lock the connecting rod with the adjusting nut sleeve. Both the adjusting nut sleeve and the locking nut sleeve are provided with a transmission connection part for connecting to a drive mechanism, which drives the adjusting nut sleeve and the locking nut sleeve to rotate. The limiting sleeve is provided on the connecting seat to limit the adjusting nut sleeve and the locking nut sleeve in the connecting cavity. The oil chamber is filled with hydraulic oil, and the adjusting nut sleeve abuts against the bottom side of the limiting sleeve.

2. The punch press die adjustment structure according to claim 1, characterized in that: The limiting sleeve extends upward to form a positioning sleeve, through which the connecting rod passes and is positioned within the positioning sleeve.

3. The punch press die adjustment structure according to claim 1, characterized in that: The groove width of the internal threads of the adjusting nut sleeve and the locking nut sleeve is greater than the tooth width of the external threads, so that the internal threads of the locking nut sleeve and the adjusting nut sleeve are clearance-fitted with the external threads.

4. The punch press die adjustment structure according to any one of claims 1 to 3, characterized in that: The tooth surface of the internal thread of the adjusting nut sleeve is an arc-shaped surface.

5. The punch press die adjustment structure according to any one of claims 1 to 3, characterized in that: The upper end of the connecting seat is provided with a clearance notch to allow the transmission connection part to connect to the drive mechanism; the transmission connection part is a cylindrical gear; the drive mechanism includes a motor and a drive gear, the drive gear meshes with the cylindrical spur gears of the adjusting nut sleeve and the locking nut sleeve, so that the drive mechanism simultaneously drives the adjusting nut sleeve and the locking nut sleeve to rotate.

6. The punch press die adjustment structure according to claim 5, characterized in that: The number of connecting rods is three sets, and each connecting rod is connected to an adjustment connecting device. Two adjacent adjustment connecting devices are connected to the same drive mechanism.

7. The punch press die adjustment structure according to any one of claims 1 to 3, characterized in that: The bottom end of the connecting rod is also provided with a mounting hole, and a displacement sensor is provided in the mounting hole. The displacement sensor is used to detect the distance between the bottom end of the connecting rod and the bottom end of the locking nut sleeve.

8. The punch press die adjustment structure according to claim 7, characterized in that: The drive mechanism drives the adjusting nut sleeve to rotate. When adjusting the distance between the bottom end of the connecting rod and the bottom end of the locking nut sleeve, the displacement sensor monitors in real time, enabling the drive mechanism to accurately control the adjustment connection device. When the punch press is stamping, the displacement sensor monitors in real time the distance between the bottom end of the connecting rod and the bottom side of the locking nut sleeve, enabling the drive mechanism to drive the adjustment connection device in real time.

9. The punch press die adjustment structure according to claim 7, characterized in that: The locking nut sleeve includes a nut sleeve, a sealing base plate, and a sealing ring. The sealing base plate is locked to the bottom end of the nut sleeve. The bottom end of the nut sleeve is provided with a step, and the sealing ring is sleeved on the step, with the sealing base plate limiting the sealing ring. The distance between the sealing base plate and the bottom wall of the connecting cavity is 1mm-3mm.

10. The punch press die adjustment structure according to claim 1, characterized in that: The bottom wall of the mounting cavity is provided with a positioning groove, and the bottom end of the connecting seat is located in the positioning groove; the bottom side of the connecting seat is also provided with an oil groove, and the oil groove and the bottom wall of the positioning groove form a sealing oil groove; the connecting seat is also provided with a through hole, and the through hole connects the sealing oil groove and the oil cavity, so that the pressure of the sealing oil groove and the oil cavity is the same.

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