Safety device for hydraulic machine

Abstract

The invention relates to a safety device used on a hydraulic machine, the safety device comprises a bottom plate, a pull rod is vertically arranged on the bottom plate in a penetrating manner, the pull rod comprises a rod part, the rod part is sleeved with at least one limiting ring, an opening and closing mechanism is arranged on the bottom plate, the opening and closing mechanism comprises a top block arranged above the bottom plate, and the top block is arranged on the bottom plate. The left side and the right side of the top block are movably connected with inclined swing arms respectively, the front sections of the inclined swing arms on the left side and the right side are located on the two sides of the pull rod respectively, long-strip-shaped holes extending in the length direction of the inclined swing arms are formed in the middle sections of the inclined swing arms, and guide rods with one ends fixed to the bottom plate are arranged in the long-strip-shaped holes in a sliding fit mode. A driving device located behind the top block is arranged on the top face of the bottom plate. The hydraulic machine using the safety device has good safety.

Description

Technical Field

[0001] The invention relates to the field of industrial manufacturing, and more particularly to a safety device used on a hydraulic press. Background Art

[0002] After the upper die seat of the hydraulic press rises, if there is a leak in the hydraulic system of the hydraulic press, the upper die seat of the hydraulic press will crawl or fall, which is easy to cause a safety accident. The existing hydraulic press safety device has poor load-bearing capacity and is not suitable for large-tonnage hydraulic presses. Although the hydraulic type hydraulic press safety device has a large load-bearing capacity, it has a complex structure and high manufacturing and maintenance costs. Summary of the invention

[0003] The object of the present invention is to provide a safety device for a hydraulic press with good safety.

[0004] To achieve the above-mentioned purpose, the present invention is a safety device for a hydraulic press, comprising a bottom plate, a pull rod is passed through the bottom plate, the pull rod comprises a rod portion, at least one limiting ring is sleeved on the rod portion, an opening and closing mechanism is provided on the bottom plate, the opening and closing mechanism comprises a top block arranged above the bottom plate, the left and right sides of the top block are movably pivoted with tilting swing arms, the front sections of the left and right tilting swing arms are respectively located on both sides of the pull rod, the middle section of the tilting swing arm is provided with a long strip hole extending along the length direction of the tilting swing arm, a guide rod with one end fixed to the bottom plate is slidably fitted in the long strip hole, and the bottom plate is provided with A driving device is located behind the top block, and the driving device includes a pushing element; in the initial state, the opening and closing mechanism is in a locked state, the front sections of the left and right inclined swing arms are close to each other, and the limiting ring of the pull rod cannot pass through the clamping state gap between the front sections of the left and right inclined swing arms in the clamping state; the driving device drives the top block to move forward through the pushing element, so that the opening and closing mechanism is switched to an open state, the front sections of the left and right inclined swing arms are separated from each other, and the limiting ring of the pull rod can pass through the separation state gap between the front sections of the left and right inclined swing arms in the separation state.

[0005] Furthermore, a through hole is provided on the bottom plate, the pull rod is passed through the through hole, a virtual longitudinal axis is set with the center point of the through hole as the reference point, and the diameter of the rod part included in the pull rod and the diameter of the limiting ring are both smaller than the aperture of the through hole.

[0006] Furthermore, a clamping state gap generated by the front sections of the left and right inclined swing arms in the clamping state on the virtual longitudinal axis is smaller than the diameter of the limiting ring of the pull rod; and a separation state gap generated by the front sections of the left and right inclined swing arms in the separated state on the virtual longitudinal axis is larger than the diameter of the limiting ring of the pull rod, and at the same time, a separation state gap generated by the front sections of the left and right inclined swing arms in the separated state on the virtual longitudinal axis is larger than the aperture of the through hole of the bottom plate.

[0007] Furthermore, a fixing block located in front of the top block is provided on the bottom plate, and at least one return spring is provided between the fixing block and the top block.

[0008] Furthermore, guide blocks are respectively arranged on the left and right sides of the top block. The guide blocks are arranged on the bottom plate. Slide grooves are opened on the inner side surfaces of the guide blocks. The top block is slidably arranged between the slide grooves on the left and right sides.

[0009] Furthermore, at least one tension spring is provided between the left and right inclined swing arms, and the tension spring is located in front of the guide rod.

[0010] Furthermore, the upper side surface of the limiting ring of the pull rod is a truncated cone side surface, and the bottom surface of the limiting ring is a plane, that is, the cross-sectional diameter of the limiting ring gradually decreases from the bottom surface of the limiting ring upwards, and the number of the limiting rings is multiple.

[0011] Furthermore, at least one nut is threadedly engaged with the guide rod slidably fitted in the long hole of the tilting swing arm, and the nut threaded on the guide rod is attached to the tilting swing arm.

[0012] Furthermore, the front section of the tilting swing arm is arc-shaped.

[0013] Furthermore, the bottom plate of the safety device is fixed on the top surface of an upper fixed plate of a hydraulic press. A through hole is formed on the upper fixed plate of the hydraulic press. The bottom of the pull rod passes through the through hole and is fixed on the upper die base of the hydraulic press, so that the upper die base of the hydraulic press can simultaneously drive the pull rod to reciprocate up and down.

[0014] After adopting the above scheme, the tensile strength of the pull rod of the present invention is high, so the safety device can withstand a large load and is suitable for use in large-tonnage hydraulic presses. The hydraulic press using the present invention has good safety.

[0015] Furthermore, the elastic force of the return spring causes the top block to move backward, so that the opening and closing mechanism is in a locked state in the initial state.

[0016] Furthermore, the tension spring functions to ensure that the opening and closing mechanism always has a tendency to change from an open state to a locked state. In an initial state, the opening and closing mechanism is in a locked state.

[0017] Furthermore, there are multiple limit rings, so that the safety device has multiple locking positions and is more adaptable; and because the upper side surface of the limit ring is a conical side surface, when one of the limit rings collides with the left and right tilted swing arms, the front sections of the left and right tilted swing arms will slide over the upper side surface of the limit ring and then separate. Therefore, after the left and right tilted swing arms are collided with the limit rings, the left and right tilted swing arms will not be damaged due to the collision.

[0018] Furthermore, the front section of the tilted swing arm is arc-shaped. When the front section of the tilted swing arm contacts the bottom surface of the limiting ring, the arc-shaped design of the front section of the tilted swing arm makes the contact area of ​​the two larger, making the load-bearing capacity of the aforementioned pull rod stronger.

[0019] Furthermore, when the upper die seat of the hydraulic press rises to the required position height, the opening and closing mechanism switches to a locking state. There is at least one limit ring above the opening and closing mechanism. At this time, if a leak occurs in the hydraulic system of the hydraulic press, causing the upper die seat of the hydraulic press to fall downward, the bottom surface of the limit ring located above the opening and closing mechanism will contact and press the aforementioned left and right inclined swing arms, that is, the limit ring above the opening and closing mechanism cannot pass through the clamping state gap between the front sections of the left and right inclined swing arms in the clamping state, so the upper die seat of the hydraulic press will not fall straight to the bottom and cause a safety accident. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a perspective view of the safety device of the present invention; Figure 2 for Figure 1 Exploded diagram of Figure 3 for Figure 1 A top view of Figure 4 is a top view of the opening and closing mechanism in a locked state; Figure 5 for Figure 3 A cross-sectional view of Figure 6 The figure is a schematic diagram of a hydraulic press to which the safety device is applied.

[0021] Explanation of the accompanying reference numerals: 1 bottom plate; 10 through hole; 2 pull rod; 21 rod; 22 limiting ring; 221 upper side surface; 222 bottom surface; 3 opening and closing mechanism; 31 top block; 32 fixed block; 33 return spring; 34 guide block; 35 slide groove; 36 tension spring; 4 tilting swing arm; 41 front section; 42 middle section; 43 long hole; 5 guide rod; 51 nut; 6 driving device; 61 pushing element; 7 hydraulic press; 70 through hole; 71 upper fixed plate; 72 upper die base; C center point; V virtual longitudinal axis; A diameter of the rod; B diameter of the limiting ring; Q aperture; M clamping state gap; N separation state gap. DETAILED DESCRIPTION

[0022] See also Figure 1-5 As shown, the present invention relates to a safety device for a hydraulic press, the safety device comprises a bottom plate 1, the bottom plate 1 is provided with a through hole 10, a pull rod 2 is passed through the through hole 10, the pull rod 2 comprises a rod portion 21, at least one limiting ring 22 is sleeved on the rod portion 21, an opening and closing mechanism 3 is provided on the bottom plate 1, the opening and closing mechanism 3 comprises a top block 31 arranged above the bottom plate 1, the left and right sides of the top block 31 are movably pivoted with tilting swing arms 4, the front sections 41 of the left and right tilting swing arms 4 are respectively located on both sides of the pull rod 2, the middle section 42 of the tilting swing arm 4 is provided with a long strip hole 43 extending along the length direction of the tilting swing arm 4, the long strip hole 43 is slidably fitted with a guide rod 5 with one end fixed on the bottom plate 1, the bottom plate 1 is provided with a driving device 6 located behind the top block 31, the driving device 6 comprises a pushing element 61; The driving device 6 is a cylinder; the driving device 6 can also be a screw-nut mechanism, which pushes the rear end surface of the top block 31 through the screw to move the top block 31 forward. The driving device 6 can also be a crank slider mechanism, a hydraulic cylinder, a cam mechanism, etc.; in this embodiment, the driving device 6 is preferably a cylinder, which is a standard part and has lower cost.

[0023] according to Figure 3 and Figure 4As shown in the view direction, the through hole 10 of the base plate 1 is a circular hole. Taking the center point C of the through hole 10 as the reference point, a virtual longitudinal axis V is set. The diameter A of the rod portion 21 included in the pull rod 2 and the diameter B of the limit ring 22 are both smaller than the aperture Q of the through hole 10, that is, A < Q and B < Q. The opening and closing mechanism 3 includes a locked state and an open state. In the initial state, the opening and closing mechanism 3 is in the locked state, and the front sections 41 of the left and right inclined swing arms 4 are close to each other. The clamping state gap M generated by the front sections 41 of the left and right inclined swing arms 4 in the clamping state on the virtual longitudinal axis V is smaller than the diameter B of the limit ring 22 of the pull rod 2, that is, M < B. The limit ring 22 of the pull rod 2 cannot pass through the clamping state gap M between the front sections 41 of the left and right inclined swing arms 4 in the clamping state. The driving device 6 drives the top block 31 to move forward through the pushing element 61, so that the opening and closing mechanism 3 is switched to the open state. The front sections 41 of the left and right inclined swing arms 4 are separated from each other. The separation state gap N generated by the front sections 41 of the left and right inclined swing arms 4 in the separation state on the virtual longitudinal axis V is larger than the diameter B of the limit ring 22 of the pull rod 2, that is, N > B. At the same time, the separation state gap N generated by the front sections 41 of the left and right inclined swing arms 4 in the separation state on the virtual longitudinal axis V is larger than the aperture Q of the through hole 10 of the base plate 1, N > Q. The limit ring 22 of the pull rod 2 can pass through the separation state gap N between the front sections 41 of the left and right inclined swing arms 4 in the separation state.

[0024] A fixed block 32 is provided on the base plate 1 in front of the top block 31. At least one return spring 33 is arranged between the fixed block 32 and the top block 31. One end of the return spring 33 abuts against the fixed block 32, and the other end of the return spring 33 abuts against and pushes the top block 31, that is, the elastic force of the return spring 33 is used to push the top block 31 backward, so that the opening and closing mechanism 3 is in the locked state in the initial state.

[0025] Guide blocks 34 are respectively arranged on the left and right sides of the top block 31. The guide blocks 34 are arranged on the base plate 1. A chute 35 is opened on the inner side surface of the guide block 34. The top block 31 is slidably arranged between the left and right chutes 35.

[0026] At least one tension spring 36 is arranged between the left and right inclined swing arms 4. The tension spring 36 is located in front of the guide rod 5. The function of the tension spring 36 is to make the opening and closing mechanism 3 always have a tendency to change from the open state to the locked state. In the initial state, the opening and closing mechanism 3 is in the locked state.

[0027] Please refer to Figure 5 、 Figure 6As shown, the upper side surface 221 of the limit ring 22 of the aforementioned pull rod 2 is a truncated cone side surface, and the bottom surface 222 of the limit ring 22 is a plane, that is, the cross-sectional diameter of the limit ring 22 gradually decreases from the bottom surface 222 of the limit ring 22 upward. There are multiple limit rings 22, so that the safety device has multiple locking positions and is more adaptable.

[0028] At least one nut 51 is screwed on the guide rod 5 that is slidably fitted in the elongated hole 43 of the tilting swing arm 4 . The nut 51 screwed on the guide rod 5 fits on the tilting swing arm 4 .

[0029] See also Figure 6 As shown, the safety device of the present invention is installed on a hydraulic press 7, the bottom plate 1 of the safety device is fixed on the top surface of the upper fixed plate 71 of the hydraulic press 7, and the bottom end of the pull rod 2 of the safety device is fixed on the top surface of the upper die seat 72 of the hydraulic press 7. The upper die seat 72 of the hydraulic press 7 can simultaneously drive the pull rod 2 to reciprocate up and down. When the aforementioned opening and closing mechanism 3 is in a locked state, the upper die seat 72 of the hydraulic press 7 falls downward and simultaneously drives the pull rod 2 to move downward. At this time, the bottom surface 222 of one of the limit rings 22 will contact and press the aforementioned left and right tilting swing arms 4, so that the aforementioned driving device 6 cannot drive the opening and closing mechanism 3 to switch to the open state by the pushing element 61. At this time, it is necessary to drive the upper die seat 72 of the hydraulic press 7 to drive the pull rod 2 to move upward, so that the limit rings 22 contacting the left and right tilting swing arms 4 are separated from the tilting swing arms 4, so that The opening and closing mechanism 3 is smoothly driven to switch to the open state through the pushing element 61 of the driving device 6. When the upper die seat 72 of the aforementioned hydraulic press 7 is manually controlled to move upward through the button switch, the upward movement distance of the upper die seat 72 is not easy to control. If the upward movement distance of the upper die seat 72 is too large, one of the limit rings 22 located below the left and right tilting swing arms 4 will hit the left and right tilting swing arms 4 during the upward movement. Since the upper side surface 221 of the limit ring 22 is a truncated cone side surface, during the collision between one of the limit rings 22 and the left and right tilting swing arms 4, the front section 41 of the left and right tilting swing arms 4 will slide from the upper side surface 221 of the limit ring 22 and then separate. Therefore, after the left and right tilting swing arms 4 are hit by the limit ring 22, the left and right tilting swing arms 4 will not be damaged due to the collision.

[0030] The front section 41 of the tilting swing arm 4 is arc-shaped. When the front section 41 of the tilting swing arm 4 contacts the bottom surface 222 of the limiting ring 22, the arc-shaped design of the front section 41 of the tilting swing arm 4 increases the contact area between the two, thereby making the load-bearing capacity of the aforementioned pull rod 2 stronger.

[0031] The upper fixing plate 71 of the hydraulic press 7 is provided with a through hole 70, and the bottom of the pull rod 2 passes through the through hole 70 and is fixed on the upper die base 72 of the hydraulic press 7; When the hydraulic press 7 is working, the push element 61 of the driving device 6 first drives the top block 31 to move forward, so that the opening and closing mechanism 3 is switched to the open state. At this time, the upper die seat 72 of the hydraulic press 7 can drive the pull rod 2 to reciprocate up and down. When the upper die seat 72 of the hydraulic press 7 rises to the required position height, the opening and closing mechanism 3 is switched to the locked state. There is at least one limit ring 22 above the opening and closing mechanism 3. At this time, if the hydraulic system of the hydraulic press 7 leaks and causes the upper die seat 72 of the hydraulic press 7 to fall downward, the bottom surface 222 of the limit ring 22 located above the opening and closing mechanism 3 will contact and press the aforementioned left and right tilting swing arms 4, that is, the limit ring 22 above the opening and closing mechanism 3 cannot pass through the clamping state gap M between the front sections 41 of the left and right tilting swing arms 4 in the clamping state, as shown in FIG. Figure 4 As shown, the upper die seat 72 of the hydraulic press 7 will not fall straight to the bottom and cause a safety accident. The pull rod 2 has a high tensile strength, so the safety device can withstand a large load and is suitable for use in a large-tonnage hydraulic press 7. The hydraulic press 7 using the safety device of this embodiment has good safety.

Claims

1. A safety device for a hydraulic press, characterized in that: The invention comprises a bottom plate, a pull rod is passed through the bottom plate, the pull rod comprises a rod portion, at least one limiting ring is sleeved on the rod portion, an opening and closing mechanism is arranged on the bottom plate, the opening and closing mechanism comprises a top block arranged above the bottom plate, the left and right sides of the top block are respectively movably pivoted with tilting swing arms, the front sections of the left and right tilting swing arms are respectively located on both sides of the pull rod, the middle section of the tilting swing arm is provided with a long hole extending along the length direction of the tilting swing arm, a guide rod with one end fixed to the bottom plate is slidably fitted in the long hole, and a driving device is arranged on the bottom plate and is located behind the top block. The driving device includes a pushing element; in the initial state, the opening and closing mechanism is in a locked state, the front sections of the left and right inclined swing arms are close to each other, and the limiting ring of the pull rod cannot pass through the clamping state gap between the front sections of the left and right inclined swing arms in the clamping state; the driving device drives the top block to move forward through the pushing element, so that the opening and closing mechanism is switched to an open state, the front sections of the left and right inclined swing arms are separated from each other, and the limiting ring of the pull rod can pass through the separation state gap between the front sections of the left and right inclined swing arms in the separation state.

2. The safety device for a hydraulic press according to claim 1, characterized in that: The bottom plate is provided with a through hole, the pull rod is passed through the through hole, a virtual longitudinal axis is set with the center point of the through hole as the reference point, and the diameter of the rod part included in the pull rod and the diameter of the limiting ring are both smaller than the aperture of the through hole.

3. The safety device for a hydraulic press according to claim 2, characterized in that: The clamping state gap generated by the front sections of the left and right inclined swing arms in the clamping state on the virtual longitudinal axis is smaller than the diameter of the limiting ring of the pull rod; and the separation state gap generated by the front sections of the left and right inclined swing arms in the separated state on the virtual longitudinal axis is larger than the diameter of the limiting ring of the pull rod, and at the same time, the separation state gap generated by the front sections of the left and right inclined swing arms in the separated state on the virtual longitudinal axis is larger than the aperture of the through hole of the bottom plate.

4. The safety device for a hydraulic press according to claim 1, characterized in that: The bottom plate is provided with a fixed block located in front of the top block, and at least one return spring is provided between the fixed block and the top block.

5. The safety device for a hydraulic press according to claim 1, characterized in that: The left and right sides of the top block are respectively provided with guide blocks, which are arranged on the bottom plate. The inner side of the guide block is provided with a slide groove, and the top block is slidably arranged between the slide grooves on the left and right sides.

6. The safety device for a hydraulic press according to claim 1, characterized in that: At least one tension spring is arranged between the left and right inclined swing arms, and the tension spring is located in front of the guide rod.

7. The safety device for a hydraulic press according to claim 1, characterized in that: The upper side surface of the limiting ring of the pull rod is a truncated cone side surface, and the bottom surface of the limiting ring is a plane, that is, the cross-sectional diameter of the limiting ring gradually decreases from the bottom surface of the limiting ring upwards, and the number of the limiting rings is multiple.

8. The safety device for a hydraulic press according to claim 1, characterized in that: At least one nut is screwed on the guide rod which is arranged in a sliding fit in the long strip hole of the tilting swing arm, and the nut screwed on the guide rod is attached to the tilting swing arm.

9. The safety device for a hydraulic press according to claim 1, characterized in that: The front section of the tilting swing arm is arc-shaped.

10. The safety device for a hydraulic press according to claim 1, characterized in that: The bottom plate of the safety device is fixed on the top surface of an upper fixed plate of a hydraulic press. A through hole is provided on the upper fixed plate of the hydraulic press. The bottom of the pull rod passes through the through hole and is fixed on the upper die base of the hydraulic press, so that the upper die base of the hydraulic press can simultaneously drive the pull rod to reciprocate up and down.

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