A support structure to prevent plunger rod sagging

Abstract

This utility model belongs to the field of hydraulic press technology and discloses a support structure to prevent plunger rod sagging. It includes a movable worktable and a push cylinder. The push cylinder includes a cylinder body and a plunger rod, with the plunger rod head connected to one end of the movable worktable. A support device is fixedly installed between the movable worktable and the push cylinder. The support device includes a base, which is fixedly installed on a base between the movable worktable and the push cylinder. Two support plates are fixed to the top surface of the base, with a pre-set gap between the inner sides of the support plates for installing rollers. The two ends of the rollers are rotatably connected to the support plates. The outer periphery of the rollers supports the plunger rod. This invention solves the technical problem in existing technologies where, even with a long stroke, the plunger rod still sags during operation, causing wear on the sealing elements and cylinder body.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic press technology, specifically relating to a support structure to prevent plunger rod from sagging. Background Technology

[0002] The statements in this section are merely background information related to this utility model and do not necessarily constitute prior art.

[0003] The moving worktable of a hydraulic press (such as a 700MN die forging and extrusion hydraulic press) is driven by a push cylinder (usually an oil cylinder). The push cylinder is placed horizontally, and the front end of the plunger rod of the push cylinder is connected to the moving worktable. When the plunger rod moves back and forth relative to the push cylinder, it can drive the moving worktable to move back and forth in the horizontal direction.

[0004] However, the stroke of the moving worktable push cylinder exceeds twenty meters. Due to the long stroke, the plunger rod will sag during operation. Over time, the plunger rod will wear down the cylinder seal, causing damage to the sealing elements of the push cylinder and resulting in leakage of high-pressure oil inside the push cylinder. At the same time, the plunger rod will also wear against the inner wall of the cylinder, affecting the service life of the sealing elements and the cylinder.

[0005] To solve the above-mentioned technical problems, the prior art discloses a movable worktable for a forging hydraulic press, including a worktable, a base and a plunger hydraulic cylinder. The worktable is located above the base. The movable worktable also includes a support block, which is fixed to the head of the plunger of the plunger hydraulic cylinder. The support block is in contact with one end of the worktable. Rollers are fixed at the left and right ends of the bottom of the support block. The top of the base is provided with a slide rail that cooperates with the rollers.

[0006] The above solution has the following drawbacks: In the above scheme, the front ends of the hydraulic cylinder plungers on both sides of the worktable are fixedly connected to support blocks, and the support blocks are slidably connected to the base. The reciprocating movement of the worktable is achieved by pushing the support blocks with the plungers on both sides. This can only make the plungers unaffected by the reciprocating convex and concave running trajectory of the worktable. However, when the stroke is relatively long, the plunger rod will still sag during operation, causing wear on the sealing elements and cylinder body. Utility Model Content

[0007] In view of this, the purpose of this utility model is to provide a support structure to prevent plunger rod sagging, which can solve the technical problem that the plunger rod still sags during operation when the stroke is relatively long, causing wear on the sealing element and cylinder.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A support structure for preventing plunger rod sagging includes a movable worktable and a push cylinder. The push cylinder includes a cylinder body and a plunger rod, with the plunger rod head connected to one end of the movable worktable. A support device is fixedly installed between the movable worktable and the push cylinder. The support device includes a base, which is fixedly installed on the base between the movable worktable and the push cylinder. Two support plates are fixed on the top surface of the base. A set distance is reserved between the inner sides of the support plates to form a gap and rollers are installed there. The two ends of the rollers are rotatably connected to the support plates. The outer periphery of the rollers supports the rod body of the plunger rod.

[0009] Furthermore, roller shafts are fixedly connected to both ends of the roller, and the roller shafts are rotatably connected to the support plate.

[0010] Furthermore, rotating holes are provided on the support plates, and bearings are fixedly installed in the rotating holes, with the roller shaft fixed to the inner ring of the bearing.

[0011] Furthermore, the gap between the two support plates is larger than the length of the roller, and there is an anti-friction gap between the roller and the support plate.

[0012] Furthermore, pressure caps are connected to the outer sides of the support plates.

[0013] Furthermore, the gland is cylindrical, with an open top and a closed bottom, and the gland is connected to the support plate by bolts.

[0014] Furthermore, the roller is a grooved roller, and the line connecting the roller and the roller shaft is perpendicular to the plunger rod.

[0015] Furthermore, the radius of the groove on the roller is equal to the radius of the plunger rod.

[0016] Furthermore, the height of the groove in the roller is higher than the height of the top of the support plate.

[0017] Furthermore, the support plate is a trapezoidal plate, with the top dimension of the support plate being smaller than the bottom dimension, and the size of the pedestal being larger than the bottom dimension of the support plate.

[0018] Compared with the prior art, the advantages and positive effects of this utility model are: In this invention, the end of the plunger rod furthest from the push cylinder is fixedly connected to the movable worktable. The push cylinder drives the movable worktable to reciprocate. A support device is installed between the push cylinder and the movable worktable to support the plunger rod, preventing excessive output stroke that could cause the plunger rod to sag between the movable worktable and the push cylinder. This also prevents the plunger rod from wearing down the cylinder seal, preventing high-pressure oil leakage from the push cylinder, and also prevents wear between the plunger rod and the inner wall of the cylinder, thus extending the service life of the sealing elements and the cylinder. The support device is fixedly installed between the movable worktable and the push cylinder, resulting in a lower manufacturing cost compared to existing technologies that use a sliding track on the base to match the bottom of the support block. Attached Figure Description

[0019] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0020] Figure 1 This is a schematic diagram of the position of a support structure for preventing plunger rod sagging according to an embodiment of the present invention; Figure 2 This is an embodiment of the present utility model. Figure 1 Cross-sectional view at point AA; In the picture: 1. Movable worktable; 2. Piston rod; 3. Push cylinder; 4. Support device; 41. Base; 42. Support plate; 43. Roller; 44. Roller shaft; 45. Pressure cap. Detailed Implementation

[0021] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0022] The present invention will now be described in detail with reference to the accompanying drawings. This embodiment discloses a support structure for preventing plunger rod sagging, such as... Figure 1 As shown, it includes a movable worktable 1 and a push cylinder 3. The push cylinder 3 includes a cylinder body and a plunger rod. The head of the plunger rod 2 is fixedly connected to one end of the movable worktable 1. When the plunger rod 2 moves back and forth relative to the push cylinder 3, it drives the movable worktable 1 to move back and forth relative to the push cylinder 3.

[0023] like Figure 1 As shown, a support device 4 is fixedly installed between the movable worktable 1 and the push cylinder 3. The top of the support device 4 supports the bottom of the plunger rod 2. In this embodiment, one end of the plunger rod 2 is fixedly connected to the movable worktable 1, and the other end is slidably connected to the inner wall of the cylinder of the push cylinder 3. The support device 4 is fixedly installed between the movable worktable 1 and the push cylinder 3. The support device 4 supports the plunger rod 2 of the push cylinder 3. When the plunger rod 2 pushes the movable worktable 1 away from the push cylinder 3, it can support the plunger rod 2 at the middle position, so as to avoid the plunger rod 2 sagging during operation due to excessive stroke, which would wear down the sealing element and the cylinder.

[0024] It is understood that in this embodiment, the movable worktable 1 is slidably connected to the base. When the plunger rod 2 of the push cylinder 3 moves back and forth relative to the push cylinder 3, it drives the movable worktable 1 to slide on the base, so that the movable worktable 1 moves back and forth relative to the base.

[0025] like Figure 2 As shown, the support device 4 includes a base 41, which is fixedly installed on the base between the movable worktable 1 and the push cylinder 3. The base 41 is the bottom bearing component of the support device 4. The base 41 is fixedly connected to the base to realize the position fixation of the support device 4.

[0026] In this embodiment, the pedestal 41 can be fixedly connected to the base by welding, or multiple bolt holes can be opened at corresponding positions on the pedestal 41 and the base, and bolts can be threaded into the bolt holes to connect the pedestal 41 and the base.

[0027] like Figure 2 As shown, two support plates 42 are fixedly connected to the top surface of the base 41. The two support plates 42 are parallel, and a predetermined distance is reserved between the inner sides of the two support plates 42 to form a gap. A roller 43 is installed in the gap, and both ends of the roller 43 are rotatably connected to the support plates 42. In this embodiment, the outer periphery of the roller 43 contacts the rod body of the plunger rod 2, that is, the outer periphery of the roller 43 supports the rod body of the plunger rod 2. When the plunger rod 2 moves relative to the push cylinder 3 under the action of the push cylinder 3, the roller 43 under the rod body of the plunger rod 2 rotates relative to the support plate 42.

[0028] It should be noted that in this embodiment, the end of the plunger rod 2 away from the push cylinder 3 (i.e., the head) is fixedly connected to the movable worktable 1. The push cylinder 3 can drive the movable worktable 1 to move back and forth. A support device 4 is installed between the push cylinder 3 and the movable worktable 1 to support the plunger rod 2, so as to avoid the output stroke being too long and causing the plunger rod 2 between the movable worktable 1 and the push cylinder 3 to sag. In the prior art, a support block is fixedly connected to the end of the plunger rod, and the support block is also slidably connected to the base. This not only fails to solve the problem of the plunger rod sag between the worktable and the push cylinder due to the excessive output stroke, but also requires the opening of a slide rail on the base that matches the bottom of the support block, resulting in a corresponding increase in cost.

[0029] In this embodiment, as Figure 2 As shown, roller shafts 44 are fixedly connected to both ends of roller 43, and roller shafts 44 are rotatably connected to support plates 42. Specifically, both support plates 42 have rotating holes, and bearings are fixedly installed in the rotating holes (the rotating holes are fixedly connected to the outer ring of the bearings). Roller shafts 44 are fixed to the inner ring of the bearings. When the plunger rod 2 moves, it drives roller 43 to rotate, and roller 43 drives roller shafts 44 to rotate relative to support plates 42.

[0030] In this embodiment, as Figure 2As shown, the reserved gap between the two support plates 42 is greater than the length of the roller 43, so that there is an anti-friction gap between the roller 43 and the support plates 42 at both ends of the roller 43, so as to avoid friction between the roller 43 and the support plates 42 at both ends when the roller 43 rotates, which would prevent the roller 43 from rotating and cause friction between the plunger rod 2 and the roller 43.

[0031] In this embodiment, as Figure 2 As shown, pressure caps 45 are connected to the outer sides of both support plates 42. It should be noted that one end of the roller shaft 44 is fixedly connected to the roller 43, and the other end is rotatably connected to the support plate 42 and extends out of the support plate 42; the pressure caps 45 connected to the outer side of the support plate 42 can play a role in preventing dust and avoiding the entry of debris, which would affect the rotation effect.

[0032] In this embodiment, as Figure 2 As shown, the pressure cap 45 is cylindrical, with an open top and a closed bottom. The top of the pressure cap 45 is mounted on the support plate 42 with the top facing the support plate 42. The length of the pressure cap 45 is greater than the length of the roller shaft 44 protruding from the support plate 42, so as to avoid friction between the end of the roller shaft 44 and the pressure cap 45.

[0033] In this embodiment, as Figure 1 , Figure 2 As shown, a number of cover bolt holes are opened on the outer edge of the bottom end of the cover 45. The same number of cover bolt holes with corresponding positions are opened on the support plate 42. The cover bolts are internally threaded and connected to the cover bolts, so that the cover 45 can be detachably connected to the support plate 42. When the roller 43 fails to rotate, the cover 45 can be removed to repair or replace the corresponding parts.

[0034] In this embodiment, as Figure 2 As shown, roller 43 is a grooved roller, and the line connecting roller 43 and roller shaft 44 is perpendicular to plunger rod 2. Using a grooved roller to support plunger rod 2 serves two purposes: first, it increases the contact area between roller 43 and plunger rod 2; second, the bottom of plunger rod 2 contacts the bottom of the groove in roller 43, and the groove in roller 43 can limit the movement of plunger rod 2.

[0035] In this embodiment, as Figure 2 As shown, the radius of the groove of the roller 43 is equal to the radius of the plunger rod 2, so that the groove of the roller 43 fits against the rod body of the plunger rod 2, and the contact area ratio between the roller 43 and the plunger rod 2 is maximized.

[0036] In this embodiment, as Figure 1 , Figure 2As shown, no matter how the roller 43 rotates, the height of the groove of the roller 43 is higher than the top height of the support plate 42, so that the top of the support plate 42 is always lower than the bottom of the plunger rod 2, thus avoiding friction between the bottom of the support plate 42 and the plunger rod 2.

[0037] In this embodiment, as Figure 1 As shown, the support plate 42 is a trapezoidal plate, the top dimension of the support plate 42 is smaller than the bottom dimension of the support plate 42, and the dimension of the pedestal 41 is larger than the bottom dimension of the support plate 42. The support plate 42 is a trapezoidal plate, and a larger pedestal 41 is connected to the support plate 42, which greatly lowers the center of gravity of the entire support device 4 and can provide a larger supporting moment to resist overturning.

[0038] It should also be noted that the support plate 42 is a trapezoidal plate with a structure that is narrower at the top and wider at the bottom. This provides a wider operating space when installing or repairing rollers and bearings at the top of the support plate 42, making the repair or installation operation more convenient.

[0039] In some embodiments, the size of the base 41 is larger than the bottom size of the support plate 42. The base 41 can act as a limiting component for the movable worktable 1 to prevent the movable worktable 1 from continuously moving in the direction of the push cylinder 3.

[0040] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.

Claims

1. A support structure to prevent drooping of a plunger rod, characterized by, It includes a movable worktable and a push cylinder. The push cylinder includes a cylinder body and a plunger rod, and the head of the plunger rod is connected to one end of the movable worktable. A support device is fixedly installed between the movable worktable and the push cylinder. The support device includes a base, which is fixedly installed on the base between the movable worktable and the push cylinder. Two support plates are fixed on the top surface of the base. A set distance is reserved between the inner sides of the support plates to form a gap and rollers are installed there. The two ends of the rollers are rotatably connected to the support plates. The outer periphery of the rollers supports the rod body of the plunger rod.

2. The support structure for preventing plunger rod sagging as described in claim 1, characterized in that, Roller shafts are fixedly connected to both ends of the roller, and the roller shafts are rotatably connected to the support plate.

3. The support structure for preventing plunger rod sagging as described in claim 2, characterized in that, Each of the support plates has a rotating hole, and a bearing is fixedly installed in the rotating hole. The roller shaft is fixed to the inner ring of the bearing.

4. The support structure for preventing plunger rod sagging as described in claim 1, characterized in that, The reserved gap between the two support plates is greater than the length of the roller, and an anti-friction gap is left between the roller and the support plate.

5. The support structure for preventing plunger rod sagging as described in claim 1, characterized in that, All the outer sides of the support plates are connected to pressure caps.

6. The support structure for preventing plunger rod sagging as described in claim 5, characterized in that, The cover is cylindrical, with an open top and a closed bottom, and is connected to the support plate by bolts.

7. The support structure for preventing plunger rod sagging as described in claim 1, characterized in that, The roller is a grooved roller, and the line connecting the roller and the roller shaft is perpendicular to the plunger rod.

8. The support structure for preventing plunger rod sagging as described in claim 7, characterized in that, The radius of the groove of the roller is equal to the radius of the plunger rod.

9. The support structure for preventing plunger rod sagging as described in claim 7, characterized in that, The groove height of the roller is higher than the top height of the support plate.

10. The support structure for preventing plunger rod sagging as described in claim 1, characterized in that, The support plate is a trapezoidal plate, with the top dimension of the support plate being smaller than the bottom dimension, and the size of the pedestal being larger than the bottom dimension of the support plate.

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