Press fitting machine with pressure buffering and overload preventing functions

Abstract

The invention relates to the technical field of press-fitting buffering, in particular to a press-fitting machine with pressure buffering and overload preventing functions. Comprising a working platform, a rotary table and a stamping mechanism, a stamping head is arranged on the stamping mechanism, a stamping bearing table and a supporting frame are arranged on a rotary disc of the rotary table, the bottom end of the supporting frame can abut against the top of the working platform, a buffering mechanism and an overload protection mechanism are arranged in the supporting frame, and the buffering mechanism comprises a buffering cylinder and a transmission rod; a plurality of disc springs providing press-fitting pressure buffering are arranged in the buffering cylinder, the buffering mechanism is arranged in the supporting frame in a locked mode through the locking device, the locking device comprises a locking claw bearing the limiting ring within preset pressure, and the overload protection mechanism is arranged in the supporting frame and is in transmission fit with the buffering cylinder. Deformation and precision deviation caused by the fact that the rotating disc bears impact force can be avoided, double buffering strokes are achieved, and the functions of pressure buffering and overload protection can be achieved.

Description

Technical Field

[0001] This invention relates to the field of pressure-loading buffer technology, specifically to a pressure-loading machine with pressure buffering and overload protection functions. Background Technology

[0002] As a core piece of equipment in the machinery manufacturing industry, press fitting machines are widely used in processes such as parts assembly and stamping. In particular, multi-station rotary table press fitting machines are increasingly used in mass production scenarios due to their ability to achieve continuous production.

[0003] The press-fitting buffer device disclosed in Chinese Patent Publication No. CN110253255B includes a transfer plate and a press set on a workbench. The press includes a press head. The transfer plate is provided with a buffer seat. The buffer seat is provided with a positioning seat for positioning the workpiece. The transfer plate moves to move the buffer seat directly below the press head. The buffer seat includes an upper movable block, a fixed block and a lower movable block. The transfer plate is provided with a through-hole. The fixed block is fixed in the through-hole. The fixed block forms a plurality of through-grooves. Guide rods are slidably mounted in the grooves. Compression springs are sleeved on the guide rods. The upper ends of the guide rods are all fixed to the upper movable block. The lower ends of the guide rods are all fixed to the lower movable block. The upper end of the compression spring is in contact with the lower end face of the upper movable block.

[0004] The aforementioned invention uses a single-specification compression spring as a buffer element, with fixed buffer stroke and buffer pressure. This makes it impossible to flexibly adjust to the pressing requirements of different workpieces. To adapt to different workpieces, the spring must be disassembled and replaced, which is cumbersome and reduces production efficiency. Furthermore, it lacks overload protection and does not include protective mechanisms for abnormal working conditions such as overload, jamming, or foreign object intrusion. When a sudden increase in pressing pressure occurs during the pressing process, the excessive impact force will directly act on the buffer seat and press components, easily causing buffer spring failure, press head damage, and even workpiece scrapping and safety accidents. The connection structure between the buffer seat and the transfer plate is relatively fixed. During the station switching process driven by the rotating disc, the reset stability of the buffer seat is insufficient, easily affecting the pressing positioning accuracy of subsequent stations. Summary of the Invention

[0005] Therefore, it is necessary to provide a press-fitting machine with pressure buffering and overload protection functions to address the existing technical problems.

[0006] To solve the problems of the prior art, the technical solution adopted by the present invention is as follows: This invention provides a press-fitting machine with pressure buffering and overload protection functions, including a working platform and a turntable and a stamping mechanism mounted on it. A stamping head is raised and lowered on the stamping mechanism. Several stamping bearing platforms are evenly arranged on the rotating disk of the turntable. Each stamping bearing platform has a support frame at its end that can be raised and lowered on the turntable and is elastically connected to it. The bottom end of the support frame can abut against the top of the working platform. A buffering mechanism and an overload protection mechanism are provided inside the support frame. The buffering mechanism includes a buffer cylinder and a transmission rod that can be raised and lowered within the buffer cylinder. A fixed rod that can fit against the transmission rod is mounted on the stamping head. The top end of the transmission rod passes through the turntable and extends upwards. Several disc springs that provide press-fitting pressure buffering are provided inside the buffer cylinder. The buffering mechanism is locked inside the support frame by a locking device. A locking ring is installed on the outer wall of the buffer cylinder. The locking device includes a locking claw that bears the limiting ring within a preset pressure. The overload protection mechanism is located inside the support frame and drives the buffer cylinder.

[0007] Preferably, the buffer mechanism further includes a pressure plate and an adjusting plate. The pressure plate is slidably disposed inside the buffer cylinder and above the disc spring, and the adjusting plate is slidably disposed inside the buffer cylinder and below the disc spring. The pressure plate is fixedly connected to the bottom end of the transmission rod, and a buffer force adjusting device that drives the adjusting plate is installed at the center of the transmission rod.

[0008] Preferably, the buffer force adjustment device includes a central adjustment rod and a transmission sleeve. The central adjustment rod is rotatably mounted on the transmission rod and coaxially mounted with the transmission rod. The transmission sleeve is rotatably mounted below the adjustment plate. The lower half of the central adjustment rod is connected to the inner wall of the transmission sleeve via a sliding groove and a limiting strip. The outer wall of the transmission sleeve is provided with an external thread, and the transmission sleeve is threadedly engaged with the bottom of the buffer cylinder.

[0009] Preferably, the top of the transmission rod is provided with a top groove, the top of the central adjusting rod is provided with a rotating ring, the top of the rotating ring is provided with a vertical insertion rod, a locking plate is detachably installed on the top groove, the locking plate is provided with an insertion hole that matches the insertion rod, and a first spring is also provided between the rotating ring and the top groove.

[0010] Preferably, the overload protection mechanism includes a hydraulic buffer rod disposed at the bottom of the inner side of the support frame, with the top of the hydraulic buffer rod abutting against the bottom of the buffer cylinder.

[0011] Preferably, the overload protection mechanism also includes an electromagnet installed inside the support frame, and a magnetic ring is installed on the buffer cylinder.

[0012] Preferably, the locking device further includes a locking seat, a locking bracket, and an abutting support block. The locking seat is fixedly installed on the side wall of the support frame. The locking seat is provided with a locking mounting groove and an unlocking mounting groove. The locking mounting groove is located above the unlocking mounting groove, and the length direction of both grooves is consistent with the diameter direction of the buffer cylinder. The depth of the locking mounting groove is less than the depth of the unlocking mounting groove. The side wall of the abutting support block near the buffer cylinder is in contact with the bottom of the locking ring. The abutting support block can be slidably disposed in the locking mounting groove and the unlocking mounting groove. The locking bracket can be slidably disposed in the unlocking mounting groove. The abutting support block is connected to the locking bracket through an overpressure unlocking rod.

[0013] Preferably, the overpressure unlocking rod consists of a pressure rod, a mounting cylinder, and a shear pin, with the shear pin passing laterally through the pressure rod and the mounting cylinder and fixing them together.

[0014] Preferably, the bottom of the locking ring is provided with an abutting chamfer, and the contact surface of the locking claw is in contact with the abutting chamfer.

[0015] Preferably, the stamping head is provided with a buffer plate, which is elastically connected to the stamping head by a buffer spring, and the fixing rod is fixedly connected to the stamping head.

[0016] The advantages of this invention compared to the prior art are: 1. This invention, by setting a liftable support frame, allows the pressing force to bypass the rotary table and be borne directly by the working platform. This avoids deformation and accuracy deviation caused by impact on the rotary table, ensuring positioning accuracy during multi-station switching. During normal pressing, the disc spring absorbs conventional impact force through elastic deformation, and the buffer plate and buffer spring on the side of the stamping head achieve bidirectional buffering to avoid workpiece contact impact damage. Furthermore, the preset compression amount of the disc spring can be flexibly adjusted through the buffering force adjustment device, adapting to the buffering requirements of different workpieces without disassembling the components.

[0017] 2. This invention achieves precise and rapid overload protection through multiple overload protection devices, including mechanical locking and unlocking, hydraulic buffering, and electromagnetic assisted limiting: Under normal operating conditions, the locking device locks the buffer cylinder through a shear pin-type overpressure unlocking rod, ensuring stable first-stage buffer stroke; during overload, the shear pin breaks precisely to unlock, and the buffer cylinder drives the overload protection mechanism to start. The hydraulic buffer rod absorbs the main impact force through throttling damping effect, and the electromagnet and magnetic ring cooperate to provide reverse adsorption resistance, which both slows down the downward speed of the buffer cylinder and limits its maximum displacement, preventing excessive compression and damage to the hydraulic buffer rod; at the same time, it cooperates with the drive source for emergency shutdown to achieve multiple overload protection functions, greatly improving protection reliability, effectively avoiding rigid collisions of equipment and damage to workpieces, and reducing the risk of safety accidents. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of a press-fitting machine with pressure buffering and overload protection functions; Figure 2 This is a front view of a press-fitting machine with pressure buffering and overload protection functions; Figure 3 This is a three-dimensional structural diagram of a support frame in a press-fitting machine with pressure buffering and overload protection functions; Figure 4 This is a three-dimensional exploded view of the support frame in a press-fitting machine with pressure buffering and overload protection functions; Figure 5 This is a three-dimensional sectional view of a support frame in a press-fitting machine with pressure buffering and overload protection functions; Figure 6 yes Figure 5 Enlarged view of point A in the middle; Figure 7 This is a cross-sectional view of a support frame in a press-fitting machine with pressure buffering and overload protection functions; Figure 8 This is a cross-sectional view of the buffer cylinder in a press-fitting machine with pressure buffering and overload protection functions; Figure 9 This is a three-dimensional structural diagram of a locking device in a press-fitting machine with pressure buffering and overload protection functions; Figure 10 This is a cross-sectional view of a locking device in a press-fitting machine that has pressure buffering and overload protection functions; Figure 11 This is a three-dimensional structural diagram of the punch head in a press machine with pressure buffering and overload protection functions.

[0019] The numbers on the map are: 1. Working platform; 2. Turntable; 3. Stamping mechanism; 4. Stamping head; 5. Rotary disk; 6. Stamping bearing platform; 7. Support frame; 8. Buffer cylinder; 9. Transmission rod; 10. Fixed rod; 11. Disc spring; 12. Locking ring; 13. Locking claw; 14. Pressure plate; 15. Adjusting plate; 16. Center adjusting rod; 17. Transmission sleeve; 18. Top groove; 19. Rotating ring; 20. Insert rod; 21. Locking plate; 22. Insertion hole; 23. First spring; 24. Hydraulic buffer rod; 25. Electromagnet; 26. Magnetic ring; 27. Locking seat; 28. Locking bracket; 29. ​​Abutment support block; 30. Locking mounting slot; 31. Unlocking mounting slot; 32. Overpressure unlocking rod; 33. Pressure rod; 34. Mounting cylinder; 35. Shearing pin; 36. Buffer plate; 37. Spring rod. Detailed Implementation

[0020] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figures 1-11The press machine shown includes a pressure buffer and overload protection function, comprising a work platform 1, a turntable 2 and a stamping mechanism 3 mounted on it, a stamping head 4 raised and lowered on the stamping mechanism 3, and a plurality of stamping bearing platforms 6 evenly arranged on the rotating disk 5 of the turntable 2. Each stamping bearing platform 6 has a support frame 7 at its end that can be raised and lowered on the rotating disk 5 and is elastically connected to the rotating disk 5. The bottom end of the support frame 7 can abut against the top of the work platform 1. The support frame 7 is provided with a buffer mechanism and an overload protection mechanism. The buffer mechanism includes a buffer cylinder. 8 and a transmission rod 9 that can be raised and lowered inside the buffer cylinder 8. A fixed rod 10 that can fit with the transmission rod 9 is installed on the stamping head 4. The top end of the transmission rod 9 passes through the rotating disk 5 and extends upward. Several disc springs 11 that provide pressure buffering are provided inside the buffer cylinder 8. The buffer mechanism is locked in the support frame 7 by a locking device. A locking ring 12 is installed on the outer wall of the buffer cylinder 8. The locking device includes a locking claw 13 that bears the limit ring within a preset pressure. The overload protection mechanism is installed in the support frame 7 and is driven and cooperates with the buffer cylinder 8.

[0022] When the press-fitting machine shown in this invention is working, the workpiece to be press-fitted is placed on the stamping support table 6. The output of the turntable 2 rotates the stamping support table 6 on the rotating disk 5 to directly below the stamping mechanism 3. At this time, the stamping head 4 can move downward to perform the press-fitting operation on the workpiece on the stamping support table 6. In order to avoid affecting the stability of the rotating disk 5 during the stamping operation, the fixed rod 10 is driven to descend synchronously while the stamping head 4 descends. The fixed rod 10 abuts against the transmission rod 9 installed on the rotating disk 5 and outputs downward pressure to the transmission rod 9. The downward pressure received on the transmission rod 9 is transmitted to the support frame 7 through the buffer mechanism, and drives the support frame 7 to move downward, so that its bottom is in contact with the top of the working platform 1. In this state, the downward pressure transmitted from the fixed rod 10 skips the rotating disk 5 and is directly borne by the working platform 1, thereby avoiding the impact of the press-fitting process on the stability and horizontal accuracy of the rotating disk 5. It is worth mentioning that the support frame 7 and the rotating disk 5 are connected by a spring rod 37. The elastic force of the spring rod 37 is less than that of the disc spring 11. During the pressing process, the support frame 7 first touches the working platform 1. After the pressing is completed, the spring rod 37 drives the support frame 7 to return to its original position.

[0023] After the bottom of the support frame 7 is in contact with the working platform 1, the fixing rod 10 continues to press down, causing the transmission rod 9, which is in contact with it, to descend. The transmission rod 9 transmits the impact force to the disc spring 11 located inside the buffer cylinder 8. The elastic deformation of the disc spring 11 achieves the buffering and absorption of the pressure. This realizes the pressure buffering process of the present invention.

[0024] During normal operation, the locking device supports the buffer cylinder 8. When the transmission rod 9 moves, the elastic deformation of the disc spring 11 absorbs and buffers the pressure, keeping the buffer cylinder 8 relatively stationary inside the support frame 7; this constitutes one stage of the buffer stroke. When an overload occurs, or in cases of sudden jamming, foreign object intrusion, or equipment failure, the impact pressure increases sharply. In this situation, the pressure on the transmission rod 9 needs to be transmitted to the overload protection mechanism for overload protection. The locking device automatically unlocks. Since the disc spring 11 is now fully compressed, the transmission rod 9 continues to press down, causing the buffer cylinder 8 to move downwards as a whole. At this point, the overload protection mechanism inside the support frame 7 supports the buffer cylinder 8, thus achieving overload protection for the downward-pressing head through the buffer mechanism and the fixing rod 10; this constitutes the second stage of the buffer stroke. The locking ring 12 works in conjunction with the locking device to lock the buffer cylinder 8 to the support frame 7 when no overload condition is reached.

[0025] The buffer mechanism also includes a pressure plate 14 and an adjusting plate 15. The pressure plate 14 is slidably disposed inside the buffer cylinder 8 and above the disc spring 11. The adjusting plate 15 is slidably disposed inside the buffer cylinder 8 and below the disc spring 11. The pressure plate 14 is fixedly connected to the bottom end of the transmission rod 9. A buffer force adjusting device that is in transmission cooperation with the adjusting plate 15 is installed at the center of the transmission rod 9.

[0026] When the buffer mechanism is working, the transmission rod 9 moves synchronously with the pressure plate 14, which is fixedly connected to it, thereby compressing the disc spring 11 inside the buffer cylinder 8. The preset buffer stroke and buffer pressure of the disc spring 11 can be adjusted by the adjusting plate 15. When the buffer pressure needs to be adjusted, the adjusting plate 15 is driven to rise and fall by the buffer force adjusting device. When the adjusting plate 15 located below the disc spring 11 moves up and down, it can compress the disc spring 11 to different degrees in advance, thereby controlling the amount of downward pressure required for the pressure plate 14 to move.

[0027] The buffer force adjustment device includes a central adjustment rod 16 and a transmission sleeve 17. The central adjustment rod 16 is rotatably mounted on the transmission rod 9 and is coaxially mounted with the transmission rod 9. The transmission sleeve 17 is rotatably mounted below the adjustment plate 15. The lower half of the central adjustment rod 16 is connected to the inner side wall of the transmission sleeve 17 via a sliding groove and a limiting strip. The outer side wall of the transmission sleeve 17 is provided with an external thread, and the transmission sleeve 17 is threadedly engaged with the bottom of the buffer cylinder 8.

[0028] The operator can rotate the central adjusting rod 16, which drives the transmission sleeve 17 connected to it to rotate. When the transmission sleeve 17 rotates, it engages with the threaded bottom of the buffer cylinder 8 through its external thread, realizing the lifting and lowering process of the transmission sleeve 17 inside the buffer cylinder 8. When the transmission sleeve 17 lifts and lowers, it drives the adjusting plate 15 connected to it to lift and lower synchronously, thereby realizing the adjustment function. It is worth mentioning that the top of the central adjusting rod 16 is provided with a transmission groove for inserting a polygonal wrench.

[0029] The top of the transmission rod 9 is provided with a top groove 18, the top of the center adjusting rod 16 is provided with a rotating ring 19, the top of the rotating ring 19 is provided with a vertical insertion rod 20, the top groove 18 is detachably provided with a locking plate 21, the locking plate 21 is provided with an insertion hole 22 that matches the insertion rod 20, and a first spring 23 is also provided between the rotating ring 19 and the top groove 18.

[0030] The rotating ring 19 and the first spring 23 can be mounted on the top of the transmission rod 9 via the top groove 18. When adjustment is required, the operator presses down the central adjusting rod 16, compressing the first spring 23 through the rotating ring 19. At the same time, the insert rod 20 separates from the insertion hole 22, allowing the central adjusting rod 16 to rotate normally and drive the adjusting plate 15 located inside the buffer cylinder 8 to rise and fall. After adjustment is completed, the central adjusting rod 16 is pushed upward under the elastic force of the first spring 23, and the insert rod 20 on the rotating ring 19 is inserted into the insertion hole 22 on the locking plate 21, thus locking the central adjusting rod 16.

[0031] The overload protection mechanism includes a hydraulic buffer rod 24 located at the bottom of the inner side of the support frame 7, with the top of the hydraulic buffer rod 24 abutting against the bottom of the buffer cylinder 8.

[0032] When overload or jamming occurs during press fitting, the locking mechanism of the buffer stroke unlocks, and the buffer cylinder 8 moves downward under the pressure of the press head. The bottom of the buffer cylinder 8 first contacts the top of the hydraulic buffer rod 24 and applies continuous pressure, pushing the piston rod of the hydraulic buffer rod 24 into the cylinder. The piston rod squeezes the hydraulic oil in the cylinder, and the hydraulic oil needs to flow between the chambers through the narrow channel of the built-in throttle valve. During this process, a significant throttling damping force is generated, which acts in the opposite direction on the buffer cylinder 8 to counteract the impact force of the press head descending. The hydraulic oil flow speed can be changed by adjusting the opening of the throttle valve, thereby adjusting the magnitude of the buffer damping force, which can be specifically set according to the actual production needs and the output pressure of the press fitting machine.

[0033] The overload protection mechanism also includes an electromagnet 25 installed inside the support frame 7 and a magnetic ring 26 installed on the buffer cylinder 8.

[0034] This component serves as an auxiliary buffer and limiting element for overload protection, activating synchronously with the hydraulic buffer rod 24: upon triggering an overload signal, the PLC controller immediately energizes the electromagnet 25, generating a strong electromagnetic attraction. The energized electromagnet 25 exerts upward suction resistance on the magnetic ring 26 on the buffer cylinder 8. This directly slows the downward speed of the buffer cylinder 8, assisting the hydraulic buffer rod 24 in absorbing the impact force; it also limits the maximum downward displacement of the buffer cylinder 8, preventing damage to the hydraulic buffer rod 24 due to excessive compression. After the overload fault is cleared, the electromagnet 25 is de-energized, the electromagnetic attraction disappears, and the buffer cylinder 8 can smoothly return to its original position under the action of the reset mechanism. The hydraulic buffer rod 24 is responsible for absorbing the main impact force (achieving smooth buffering through hydraulic damping), while the electromagnet 25 and magnetic ring 26 provide reverse resistance through electromagnetic attraction. Their combined action significantly improves the stability of overload protection, preventing equipment damage caused by the failure of a single buffer component.

[0035] The locking device also includes a locking seat 27, a locking bracket 28, and an abutment support block 29. The locking seat 27 is fixedly installed on the side wall of the support frame 7. The locking seat 27 is provided with a locking mounting groove 30 and an unlocking mounting groove 31. The locking mounting groove 30 is located above the unlocking mounting groove 31, and the length direction of both grooves is consistent with the diameter direction of the buffer cylinder 8. The depth of the locking mounting groove 30 is less than the depth of the unlocking mounting groove 31. The side wall of the abutment support block 29 near the buffer cylinder 8 is in contact with the bottom of the locking ring 12. The abutment support block 29 can be slidably disposed in the locking mounting groove 30 and the unlocking mounting groove 31. The locking bracket 28 can be slidably disposed in the unlocking mounting groove 31. The abutment support block 29 is connected to the locking bracket 28 through the overpressure unlocking rod 32.

[0036] During normal operation of the equipment, the locking ring 12 on the buffer cylinder 8 is locked by the locking claw 13. The side wall of the locking claw 13 is supported by the abutment support block 29. In the initial state, the abutment support block 29 is located in the locking mounting groove 30. The side wall of the abutment support block 29 is in contact with the side wall of the locking mounting groove 30, so that it will not move radially along the buffer cylinder 8. The overpressure unlocking rod 32 set on the locking bracket 28 is used to support the height of the abutment support block 29, so that it is kept in the locking mounting groove 30, thereby maintaining the state of the locking claw 13 and the locking ring 12, and thus ensuring that the position of the buffer cylinder 8 is relatively stable.

[0037] After overload, the pressure of the downward pressure head is too high, causing the support block 29 to break the overpressure unlocking rod 32 and move downward. The support block 29 then slides into the unlocking mounting groove 31 and can slide outward, thereby releasing the locking state between the locking claw 13 and the locking ring 12. At this time, the buffer cylinder 8 and the support frame 7 can move relative to each other.

[0038] The overpressure unlocking rod 32 consists of a pressure rod 33, a mounting cylinder 34, and a shear pin 35. The shear pin 35 passes laterally through the pressure rod 33 and the mounting cylinder 34 and fixes them together.

[0039] When the pressure is too high, the shear pin 35 breaks, and the pressure rod 33 is compressed into the mounting cylinder 34, which abuts against the support block 29 to achieve the lowering and unlocking function.

[0040] The bottom of the locking ring 12 is provided with an abutting chamfer, and the mating surface of the locking claw 13 is mated with the abutting chamfer.

[0041] The chamfered design allows the locking ring 12 to push the locking claw 13 to deflect radially outward along the buffer cylinder 8 when the pressure is too high, and the locking claw 13 drives the abutment support block 29 to slide toward the unlocking mounting groove 31.

[0042] The punch head 4 is provided with a buffer plate 36, which is elastically connected to the punch head 4 through a buffer spring, and the fixing rod 10 is fixedly connected to the punch head 4.

[0043] The buffer plate 36 and buffer spring on the side of the stamping head 4 are responsible for front-end buffering from the top of the workpiece, weakening the contact impact, and protecting the workpiece and the stamping head 4.

[0044] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A press machine with pressure buffering and anti-overloading functions, characterized in that, The utility model provides a kind of stamping mechanism, including work platform (1) and installation on it rotary table (2) and stamping mechanism (3), stamping mechanism (3) is provided with stamping head (4) up and down, the rotating disc (5) of rotary table (2) is evenly provided with several stamping bearing tables (6), the end of each stamping bearing table (6) is installed with the support frame (7) that can be up and down on rotating disc (5) and is elastically connected with rotating disc (5), the bottom of support frame (7) can be contacted with the top of work platform (1), support frame (7) is equipped with buffer mechanism and overload protection mechanism inside, buffer mechanism includes buffer cylinder (8) and the transmission rod (9) that can be up and down in buffer cylinder (8), stamping head (4) is installed with the fixed rod (10) that can be attached with transmission rod (9), the top of transmission rod (9) passes through rotating disc (5) and extends upwards, buffer cylinder (8) is equipped with several disc springs (11) inside providing pressure buffer of pressure assembly, buffer mechanism is locked in support frame (7) by locking device, locking ring (12) is installed on the outside wall of buffer cylinder (8), locking device includes locking claw (13) that bearing limit ring in pre-set pressure, overload protection mechanism is set in support frame (7) and is transmission cooperation with buffer cylinder (8).

2. The press machine with pressure buffering and anti-overloading functions according to claim 1, characterized in that, Buffer mechanism further includes pressing plate (14) and adjusting plate (15), pressing plate (14) is slidably arranged in the inside of buffer cylinder (8) and is above disc spring (11), adjusting plate (15) is slidably arranged in the inside of buffer cylinder (8) and is below disc spring (11), pressing plate (14) is fixedly connected with the bottom of transmission rod (9), transmission rod (9) center is installed with the buffer force adjusting device that is transmission cooperation with adjusting plate (15).

3. The press machine with pressure buffering and anti-overloading functions according to claim 2, characterized in that, Buffer force adjusting device includes center adjusting rod (16) and transmission sleeve (17), center adjusting rod (16) can be rotatably arranged on transmission rod (9) and is coaxially arranged with transmission rod (9), transmission sleeve (17) can be rotatably arranged below adjusting plate (15), the lower half of center adjusting rod (16) is transmission connected with the inside wall of transmission sleeve (17) through sliding groove and limiting strip, the outside wall of transmission sleeve (17) is provided with external thread, transmission sleeve (17) is screw threadedly cooperated with the bottom of buffer cylinder (8).

4. The press machine with pressure buffering and anti-overloading functions according to claim 3, characterized in that, The top of transmission rod (9) is provided with top groove (18), the top of center adjusting rod (16) is installed with rotating ring (19), the top of rotating ring (19) is vertically provided with inserting rod (20), the top groove (18) is detachably installed with locking plate (21), the locking plate (21) is provided with insertion hole (22) matched with inserting rod (20), the first spring (23) is further provided between rotating ring (19) and top groove (18).

5. The press machine with pressure buffering and anti-overloading functions according to claim 1, characterized in that, Overload protection mechanism includes hydraulic buffer rod (24) arranged in the inside bottom of support frame (7), the top of hydraulic buffer rod (24) is contacted and matched with the bottom of buffer cylinder (8).

6. The press machine with pressure buffering and anti-overloading functions according to claim 1, characterized in that, Overload protection mechanism further includes electromagnet (25) installed in the inside of support frame (7), magnetic ring (26) is installed on buffer cylinder (8).

7. The press machine with pressure buffering and anti-overloading functions according to claim 1, characterized in that, The locking device further comprises a locking seat (27), a locking support (28) and a contact support block (29), the locking seat (27) is fixedly installed on the side wall of the support frame (7), the locking seat (27) is provided with a locking installation groove (30) and an unlocking installation groove (31), the locking installation groove (30) is located above the unlocking installation groove (31) and the length directions of the two grooves are consistent with the radial direction of the buffer cylinder (8), the depth of the locking installation groove (30) is less than the depth of the unlocking installation groove (31), the side wall near the side of the contact support block (29) close to the buffer cylinder (8) is attached to the bottom of the locking ring (12), the contact support block (29) can be slidably arranged in the locking installation groove (30) and the unlocking installation groove (31), the locking support (28) can be slidably arranged in the unlocking installation groove (31), and the contact support block (29) is connected to the locking support (28) through an overpressure unlocking rod (32).

8. The press machine with pressure buffering and anti-overloading functions according to claim 7, characterized in that, The overpressure unlocking rod (32) is composed of a pressure rod (33), an installation cylinder (34) and a shear pin (35), the shear pin (35) transversely passes through the pressure rod (33) and the installation cylinder (34) and fixedly connects the two.

9. The press machine with pressure buffering and anti-overloading functions according to claim 8, characterized in that, The bottom of the locking ring (12) is provided with a contact chamfer, and the contact surface of the locking claw (13) is attached to the contact chamfer.

10. The press machine with pressure buffering and anti-overloading functions according to claim 1, characterized in that, The punch head (4) is provided with a buffer plate (36), the buffer plate (36) is elastically connected with the punch head (4) through a buffer spring, and the fixed rod (10) is fixedly connected with the punch head (4).

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