Pneumatic buffer mechanism and mold having the same

Abstract

The present invention discloses a pneumatic buffer mechanism and a mold with the pneumatic buffer mechanism, which belongs to the field of buffer mechanisms and includes a buffer head, a top cover, a piston rod, a piston head, a cylinder sleeve and a bottom cover. The buffer head is connected to the top end of the piston rod, the piston head is arranged in the cylinder sleeve, the bottom end of the piston rod extends into the cylinder sleeve and is connected to the piston head, and an air inlet is arranged in the middle of the bottom cover. The pneumatic buffer mechanism of the present invention is used to buffer the relative motion structure in the mold, such as between the upper mold base and the pressing core of the automobile mold, and plays a buffering role between the upper mold base and the pressing core. When the pressure on the buffer head is greater than the air pressure of the compressed gas, the air pressure in the cylinder sleeve plays a buffering role on the piston head, thereby playing a buffering role on the components connected to the buffer head. The structure is simple, and the buffering force can be adjusted by adjusting the gas pressure entering the cylinder sleeve, and it has wide versatility.

Description

Technical Field

[0001] The invention relates to the field of buffer mechanisms, and in particular to a pneumatic buffer mechanism and a mold having the pneumatic buffer mechanism. Background Art

[0002] In order to prevent wrinkling during deep drawing, a die buffer device is installed on the stamping machine. In order to improve the deep drawing processability of the stamping machine and prevent the workpiece from breaking or deforming, the existing buffer mechanism for the die generally adopts nitrogen springs or ordinary springs. However, due to pressure limitations, the buffer capacity is limited and cannot be adjusted according to the actual buffer force, and the versatility is low. Summary of the invention

[0003] The purpose of the present invention is to provide a pneumatic buffer mechanism and a mold having the pneumatic buffer mechanism.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] A pneumatic buffer mechanism comprises a buffer head, a top cover, a piston rod, a piston head, a cylinder sleeve and a bottom cover, wherein the top cover and the bottom cover are respectively arranged at two ends of the cylinder sleeve, the buffer head is connected to the top end of the piston rod, the piston head is arranged in the cylinder sleeve, the bottom end of the piston rod extends into the cylinder sleeve and is connected to the piston head, and an air inlet is arranged in the middle of the bottom cover.

[0006] Preferably, the pneumatic buffer mechanism further comprises a return spring, the top end of the return spring abuts against the top cover, and the bottom end of the return spring abuts against the bottom cover.

[0007] Preferably, the pneumatic buffer mechanism further comprises a connecting block, which is sleeved on the top end of the piston rod and connected to the piston rod via a set screw, and the buffer head is connected to the connecting block via a bolt.

[0008] Preferably, the pneumatic buffer mechanism further comprises a mounting block, wherein the mounting block is arranged on one side of the top cover, a mounting hole is opened on the mounting block, and the mounting block and the top cover are integrally manufactured.

[0009] Preferably, the pneumatic buffer mechanism also includes a first sealing ring and a second sealing ring, the bottom cover is provided with a circumferentially arranged first annular groove, the first sealing ring is arranged in the first annular groove, the outer side of the first sealing ring is in contact with the inner wall of the cylinder liner, the outer side of the piston head is provided with a circumferentially arranged second annular groove, the second sealing ring is arranged in the second annular groove, and the outer side of the second sealing ring is in contact with the inner wall of the cylinder liner.

[0010] Preferably, the buffer head is made of sound-absorbing polyurethane.

[0011] Preferably, the pneumatic buffer mechanism also includes a spring pin, a first semi-cylindrical mating groove is opened on the outer side of the bottom end of the piston rod, a second semi-cylindrical mating groove is opened on the inner side of the piston head, the second mating groove passes through the bottom end of the piston head, the first mating groove and the second mating groove are spliced ​​to form a pin groove, and the spring pin is arranged in the pin groove.

[0012] A mold with a pneumatic buffer mechanism includes an upper mold assembly and a lower mold assembly arranged up and down, the upper mold assembly includes an upper mold base and a pressure core, a plurality of pneumatic buffer mechanisms are arranged between the upper mold base and the pressure core, the bottom cover is connected to the upper mold base, the buffer head is against the pressure core, the lower mold assembly includes a lower mold base and a lower concave mold, and the pressure core corresponds to the lower concave mold up and down.

[0013] Preferably, the upper mold assembly also includes an upper cover plate and an air intake valve, the upper cover plate is arranged on the top of the upper mold base, the air intake valve is arranged on one side of the upper mold base, the air intake ports of the multiple pneumatic buffer mechanisms are connected to the air intake valve through an air pipe, and the bottom cover is connected to the upper cover plate by bolts.

[0014] The beneficial effects of the present invention are as follows: the pneumatic buffer mechanism of the present invention is used to buffer the relative moving structure in the mold, such as between the upper mold base and the pressing core of the automobile mold, and plays a buffering role between the upper mold base and the pressing core. The air inlet of the bottom cover is connected to the external air source, so that the compressed gas enters the interior of the cylinder sleeve. When the volume of the compressed gas entering the cylinder sleeve increases, the piston head drives the piston rod to move outward until the compressed gas fills the cylinder sleeve. When the pressure on the buffer head is greater than the air pressure of the compressed gas, the air pressure in the cylinder sleeve buffers the piston head, thereby buffering the components connected to the buffer head. The structure is simple, and the buffering force can be adjusted by adjusting the pressure of the gas entering the cylinder sleeve. It has wide versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings further illustrate the present invention, but the contents in the accompanying drawings do not constitute any limitation to the present invention.

[0016] Figure 1 is a schematic diagram of the external structure of the pneumatic buffer mechanism of Example 1 of the present invention;

[0017] Figure 2 is a schematic diagram of the internal structure of the pneumatic buffer mechanism of Example 1 of the present invention;

[0018] Figure 3 1 is a schematic structural diagram of an upper mold assembly of a mold with a pneumatic buffer mechanism according to Embodiment 2 of the present invention;

[0019] Figure 4 It is a schematic diagram of the top structure of the upper mold assembly of the mold with a pneumatic buffer mechanism according to Example 2 of the present invention.

[0020] Among them: buffer head 101, top cover 102, piston rod 103, piston head 104, cylinder sleeve 105, bottom cover 106, return spring 107, connecting block 108, mounting block 109, first sealing ring 111, second sealing ring 112, spring pin 121, pin groove 122, upper die seat 200, pressing core 210, pneumatic buffer mechanism 100, upper cover plate 220. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0022] Example 1

[0023] The pneumatic buffer mechanism 100 of this embodiment is shown in FIG. Figure 1 and 2 , including a buffer head 101, a top cover 102, a piston rod 103, a piston head 104, a cylinder sleeve 105 and a bottom cover 106. The two ends of the cylinder sleeve 105 are respectively covered with a top cover 102 and a bottom cover 106. The buffer head 101 is connected to the top end of the piston rod 103, the piston head 104 is arranged in the cylinder sleeve 105, the bottom end of the piston rod 103 extends into the cylinder sleeve 105 and is connected to the piston head 104, and an air inlet 131 is provided in the middle of the bottom cover 106.

[0024] The pneumatic buffer mechanism 100 of this embodiment is used to buffer the relative moving structure in the mold, such as between the upper mold base 200 and the pressing core 210 of the automobile mold, and plays a buffering role between the upper mold base 200 and the pressing core 210. The air inlet 131 of the bottom cover 106 is connected to the external air source, so that the compressed gas enters the interior of the cylinder sleeve 105. When the volume of the compressed gas entering the cylinder sleeve 105 increases, the piston head 104 drives the piston rod 103 to move outward until the compressed gas fills the cylinder sleeve 105. When the pressure on the buffer head 101 is greater than the air pressure of the compressed gas, the air pressure in the cylinder sleeve 105 buffers the piston head 104, thereby buffering the components connected to the buffer head 101. The structure is simple, and the buffering force can be adjusted by adjusting the pressure of the gas entering the cylinder sleeve 105. It has wide versatility.

[0025] The buffer head 101 is used to counteract the buffered object. When the pneumatic buffer mechanism 100 is in an inflated state, the thrust of the buffered object on the buffer head 101 must be greater than the gas pressure in the cylinder sleeve 105 to enable the buffer head 101 to move toward the cylinder sleeve 105, thereby effectively reducing the moving speed between the buffered objects and playing a protective role for the structure to be buffered.

[0026] Preferably, the pneumatic buffer mechanism 100 further includes a return spring 107 , the top end of the return spring 107 abuts against the top cover 102 , and the bottom end of the return spring 107 abuts against the bottom cover 106 .

[0027] A return spring 107 is provided to restore the piston head 104; when the pneumatic buffer mechanism 100 is in normal operation, the return spring 107 is in a compressed state; when the external air source is disconnected, the air pressure in the cylinder sleeve 105 drops to atmospheric pressure, at which time the return spring 107 pushes the piston head 104 to the bottom cover 106, thereby restoring the piston head.

[0028] Preferably, the pneumatic buffer mechanism 100 further includes a connecting block 108 , which is sleeved on the top end of the piston rod 103 and connected to the piston rod 103 via a set screw, and the buffer head 101 is connected to the connecting block 108 via a bolt.

[0029] A connecting block 108 is arranged at the top end of the piston rod 103 to connect the buffer head 101 and the piston rod 103. The piston rod 103 and the connecting block 108 are connected by a set screw, which makes the connection more compact and avoids the piston rod 103 and the connecting block 108 from being separated under high pressure.

[0030] Preferably, the pneumatic buffer mechanism 100 also includes a first sealing ring 111 and a second sealing ring 112, the bottom cover 106 is provided with a circumferentially arranged first annular groove, the first sealing ring 111 is arranged in the first annular groove, the outer side of the first sealing ring 111 is in contact with the inner wall of the cylinder liner 105, the outer side of the piston head 104 is provided with a circumferentially arranged second annular groove, the second sealing ring 112 is arranged in the second annular groove, and the outer side of the second sealing ring 112 is in contact with the inner wall of the cylinder liner 105.

[0031] By providing the first sealing ring 111 and the second sealing ring 112, the air tightness inside the cylinder liner 105 is ensured, and the compressed gas is prevented from leaking out of the cylinder liner 105, resulting in buffer failure; wherein, the inner and outer sides of the first sealing ring 111 are respectively in contact with the inner walls of the bottom cover 106 and the cylinder liner 105, thereby achieving a gas sealing effect between the bottom cover 106 and the cylinder liner 105; the inner and outer sides of the second sealing ring 112 are respectively in contact with the piston head 104 and the inner side of the cylinder liner 105, thereby preventing the compressed gas from leaking through the piston head 104 and the cylinder liner 105.

[0032] Furthermore, the buffer head 101 is made of sound-absorbing polyurethane.

[0033] The buffer head 101 made of sound-absorbing polyurethane can reduce the noise when the buffer part collides with the buffer head 101 and the connecting block 108 and the mounting block 109, and also has a certain buffering effect between the buffer head 101 and the buffered object.

[0034] Preferably, the pneumatic buffer mechanism 100 also includes a spring pin 121, a semi-cylindrical first mating groove is opened on the outer side of the bottom end of the piston rod 103, a semi-cylindrical second mating groove is opened on the inner side of the piston head 104, the second mating groove passes through the bottom end of the piston head 104, the first mating groove and the second mating groove are spliced ​​to form a pin groove 122, and the spring pin 121 is arranged in the pin groove 122.

[0035] A spring pin 121 is used to connect the piston rod 103 and the bottom cover 106. During assembly, the spring pin 121 is inserted from the second matching groove. The installation of the piston rod 103 and the bottom cover 106 is achieved through the elasticity of the spring pin 121. The assembly is simple and the structure is compact, which avoids affecting the stability of the connection between the piston rod 103 and the piston head 104 when subjected to large forces.

[0036] Example 2

[0037] The mold with the pneumatic buffer mechanism 100 of this embodiment includes an upper mold assembly and a lower mold assembly arranged in a vertical direction. Figure 3 and 4 The upper mold assembly includes an upper mold base 200 and a pressure core 210. A plurality of pneumatic buffer mechanisms 100 are arranged between the upper mold base 200 and the pressure core 210. The bottom cover 106 is connected to the upper mold base 200. The buffer head 101 is against the pressure core 210. The lower mold assembly includes a lower mold base and a lower concave mold. The pressure core 210 corresponds to the lower concave mold up and down.

[0038] The pneumatic buffer mechanism 100 is arranged between the upper mold base 200 and the punch core 210, and plays a buffering role between the upper mold base 200 and the punch core 210. At the same time, when the mold is closed to form the product, a misalignment is required between the upper mold base 200 and the punch core 210 to generate shear force or drawing force, etc., and when the upper mold assembly and the lower mold assembly are separated, the pneumatic buffer mechanism 100 provides a thrust to make the upper mold base 200 return to its initial position upward.

[0039] Furthermore, the upper mold assembly also includes an upper cover plate 220 and an air intake valve. The upper cover plate 220 is covered on the top of the upper mold base 200, and the air intake valve is arranged on one side of the upper mold base 200. The air inlets 131 of multiple pneumatic buffer mechanisms 100 are connected to the air intake valve through an air pipe, and the bottom cover 106 is connected to the upper cover plate 220 by bolts.

[0040] The air intake valve is used to connect the external air source with multiple pneumatic buffer mechanisms 100 arranged between the upper mold base 200 and the pressing core 210. The output end of the air intake valve is connected to the air inlet 131 through an air pipe, which is convenient for controlling the air intake and disconnection of the pneumatic buffer mechanism 100; an upper cover plate 220 is arranged at the upper end of the upper mold base 200 to facilitate the operator to repair the pneumatic buffer mechanism 100 and its pneumatic circuit.

[0041] Furthermore, a plurality of pneumatic buffer mechanisms 100 may be provided between the lower die base and the lower concave die to provide a buffer between the lower die base and the lower concave die, thereby effectively reducing the vibration and noise generated by the upper die assembly and the lower die assembly when the die is closed.

[0042] The technical principle of the present invention is described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific implementations of the present invention without paying creative labor, and these methods will fall within the scope of protection of the present invention.

Claims

1. A pneumatic buffer mechanism, characterized in that: It includes a buffer head, a top cover, a piston rod, a piston head, a cylinder sleeve and a bottom cover, wherein the top cover and the bottom cover are respectively arranged at both ends of the cylinder sleeve, the buffer head is connected to the top end of the piston rod, the piston head is arranged in the cylinder sleeve, the bottom end of the piston rod extends into the cylinder sleeve and is connected to the piston head, and an air inlet is arranged in the middle of the bottom cover; The buffer head is made of sound-absorbing polyurethane; It also includes a spring pin, a first semi-cylindrical matching groove is opened on the outer side of the bottom end of the piston rod, a second semi-cylindrical matching groove is opened on the inner side of the piston head, the second matching groove passes through the bottom end of the piston head, the first matching groove and the second matching groove are spliced ​​to form a pin groove, and the spring pin is arranged in the pin groove.

2. A pneumatic buffer mechanism according to claim 1, characterized in that: It also includes a return spring, the top end of which abuts against the top cover, and the bottom end of which abuts against the bottom cover.

3. A pneumatic buffer mechanism according to claim 1, characterized in that: It also includes a connecting block, which is sleeved on the top end of the piston rod and connected to the piston rod through a set screw, and the buffer head is connected to the connecting block through a bolt.

4. A pneumatic buffer mechanism according to claim 1, characterized in that: It also includes a mounting block, which is arranged on one side of the top cover. A mounting hole is opened on the mounting block, and the mounting block and the top cover are made in one piece.

5. A pneumatic buffer mechanism according to claim 1, characterized in that: It also includes a first sealing ring and a second sealing ring, the bottom cover is provided with a circumferentially arranged first annular groove, the first sealing ring is arranged in the first annular groove, the outer side of the first sealing ring is in contact with the inner wall of the cylinder liner, the outer side of the piston head is provided with a circumferentially arranged second annular groove, the second sealing ring is arranged in the second annular groove, and the outer side of the second sealing ring is in contact with the inner wall of the cylinder liner.

6. A mold with a pneumatic buffer mechanism, characterized in that: It includes an upper mold assembly and a lower mold assembly arranged up and down, the upper mold assembly includes an upper mold base and a pressure core, a plurality of pneumatic buffer mechanisms as described in any one of claims 1 to 5 are arranged between the upper mold base and the pressure core, the bottom cover is connected to the upper mold base, the buffer head is against the pressure core, the lower mold assembly includes a lower mold base and a lower concave mold, and the pressure core corresponds to the lower concave mold up and down.

7. The mold with a pneumatic buffer mechanism according to claim 6, characterized in that: The upper mold assembly also includes an upper cover plate and an air intake valve. The upper cover plate is arranged on the top of the upper mold base, and the air intake valve is arranged on one side of the upper mold base. The air intake ports of the multiple pneumatic buffer mechanisms are connected to the air intake valve through air pipes, and the bottom cover is connected to the upper cover plate by bolts.

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