Table press with hydraulic force multiplier

Abstract

The utility model discloses a table type press with hydraulic pressure force increasing mechanism belongs to press technical field. Including frame, the fixed plate is installed to frame upside, and its inner wall is installed with first boss, and the guide rod is connected between fixed plate and first boss, and the support plate is slidably sleeved on the guide rod, and two connecting plates are connected and installed on the frame, and the fixed cylinder is installed between two connecting plates, and the piston cylinder is slidably connected in the fixed cylinder, and the small piston chamber and the big piston chamber are equipped with respectively on the upside and downside of piston cylinder, and the small piston rod of fixed connection is slidably connected in the small piston chamber with support plate, and the big piston rod is slidably installed in the big piston chamber, and the first check valve and the second check valve between small piston chamber and big piston chamber, and the limiting mechanism that can support locking piston cylinder is equipped on fixed cylinder. The device drives piston assembly to be close to the workpiece to be pressed fast through power mechanism, and the force of small piston rod is amplified on big piston rod through piston cylinder, makes the output greater pressure, improves the efficiency, and outputs the big pressure.

Description

Technical Field

[0001] This utility model belongs to the field of press technology, specifically a benchtop press with a hydraulic force-boosting mechanism. Background Technology

[0002] A benchtop press is a small pressure assembly device that can be placed on a workbench. Its core function is to apply controllable pressure to complete workpiece assembly, pressing and other operations. It is widely used in many fields such as machining and automobile repair, and is suitable for small-batch production, repair stations and other scenarios.

[0003] Its core application is interference fit assembly, including pressing bearings, bushings, pins, and straightening small workpieces. It is a basic assembly equipment for small and medium-sized enterprises and repair shops.

[0004] Currently, mainstream small benchtop presses are divided into two main categories according to their transmission and power methods, as detailed below:

[0005] The first type is a purely mechanical transmission type, which uses a lead screw, gear rack, or lever transmission as its core. It requires no external power and relies on human power for operation. Its working principle is that human power is input through a handwheel or handle, which is converted into linear pressure through the transmission mechanism to drive the press head to work. After completion, the mechanism returns to its original position by its own return stroke. This type of equipment has a simple structure and low cost, but it is limited by human power, and the maximum output force is only 1-2 tons, which cannot meet the assembly needs of workpieces with large interference fits. Although there are presses that can output greater pressure with human power, the pressing is slow during the idle stroke, resulting in low operating efficiency.

[0006] The second type is the independent hydraulic station type, which consists of an independent hydraulic pump station, hydraulic cylinders, etc., and requires an external power supply. Its working principle is that the hydraulic pump station converts electrical energy into hydraulic energy, which drives the piston to drive the pressure head to apply pressure, which can reach more than 10 tons. This type of equipment has a strong pressing capacity, but it is large in size and expensive. Due to power supply limitations, it is not suitable for small workbenches and mobile workstations. Utility Model Content

[0007] To address the problems of low output pressure, low working efficiency, large size, high cost, and inconvenience in moving existing benchtop presses, this utility model provides a benchtop press with a hydraulic force-boosting mechanism.

[0008] This utility model is achieved through the following technical solution:

[0009] A benchtop press with a hydraulic boosting mechanism includes a frame and a worktable connected and mounted on the frame. A fixed plate is connected and mounted inside the upper side of the frame, and a first boss is connected and mounted on both inner walls of the fixed plate. A guide rod is connected and mounted between the fixed plate and the first boss. A support plate is slidably mounted on the guide rod. Two connecting plates are connected and mounted on the frame. A fixed cylinder is connected and mounted between the two connecting plates. A piston cylinder is slidably mounted inside the fixed cylinder. The piston cylinder has a small piston chamber and a large piston chamber on its upper and lower sides, respectively. A small piston rod is slidably mounted and fixedly connected to the support plate in the small piston chamber. A large piston rod is slidably mounted and mounted in the large piston chamber. A pressure head is connected and mounted below the large piston rod. A first check valve that allows hydraulic oil to flow from the small piston chamber to the large piston chamber and a second check valve that allows hydraulic oil to flow from the large piston chamber to the small piston chamber are connected and mounted between the small piston chamber and the large piston chamber. A limiting mechanism that can support and lock the piston cylinder is provided on the fixed cylinder.

[0010] It also includes a power mechanism that can drive the support plate to move up and down.

[0011] A further improvement of this utility model is that the limiting mechanism includes several limiting piston cavities that are evenly arranged around the piston cylinder and communicate with the large piston cavity. A piston pin is slidably installed in the limiting piston cavity, and several vertically arrayed pin grooves corresponding to the piston pin are provided on the inner wall of the fixed cylinder.

[0012] A further improvement of this utility model is that the power mechanism includes a rotating shaft rotatably connected and installed on the upper side of the frame, first bevel gears connected and installed on both sides of the rotating shaft, a lead screw rotatably connected and threadedly connected to the support plate between the fixed plate and the first boss, a second bevel gear meshing with the first bevel gear connected and installed at the end of the lead screw, and a rotating handle fixedly connected to the rotating shaft rotatably connected and installed on the outer side of the frame.

[0013] A further improvement of this utility model is that the first one-way valve is a sequence valve with a certain pressure threshold.

[0014] A further improvement of this invention is that the pressure head and the large piston rod are detachably connected.

[0015] A further improvement of this utility model is that a second protrusion is provided at the bottom of the small piston chamber.

[0016] As can be seen from the above technical solutions, the beneficial effects of this utility model are:

[0017] In use, the workpiece requiring interference fitting is placed on the worktable. The power mechanism presses down the support plate, causing it to slide downwards along the guide rod, which in turn pushes the small piston rod downwards. Since the pressure head is not in contact with the workpiece, the small piston rod, along with the piston cylinder, slides downwards along the fixed cylinder. When the pressure head contacts the workpiece, the workpiece's support causes the large piston rod to experience an upward supporting force, increasing the hydraulic oil pressure inside both the large and small piston chambers. Because the piston area of ​​the small piston rod is smaller than that of the large piston rod, the hydraulic oil pressure in the small piston chamber is greater than that in the large piston chamber. This causes the hydraulic oil in the small piston chamber to flow into the large piston chamber through the first one-way valve. If the piston cylinder is not limited, it will tend to move upwards along the fixed cylinder. However, the limiting mechanism exerts a downward supporting force on the piston cylinder, preventing it from moving upwards. As the small piston rod moves downward, hydraulic oil flows from the small piston chamber to the large piston chamber. The large piston rod then continues to move downward to press the workpiece. According to Pascal's law, the piston area is proportional to the pressure generated, so the pressure exerted on the workpiece by the large piston rod through the pressure head is greater than the pressure exerted on the small piston rod by the power mechanism. When the workpiece pressing task is completed, the power mechanism moves the support plate upward, which in turn moves the small piston rod upward. At this time, because the piston cylinder is still locked by the lower support, the pressure in the small piston chamber is less than the pressure in the large piston chamber. Therefore, the hydraulic oil in the large piston chamber flows to the small piston chamber through the second check valve. The large piston rod then moves upward along the large piston chamber, causing the pressure head to leave the workpiece. At this point, the limiting mechanism releases the support lock on the piston cylinder, allowing the piston cylinder to slide upward along the fixed cylinder as the small piston rod continues to move upward, ready for the next operation. This device uses a power mechanism to drive the entire piston assembly to quickly approach the workpiece to be pressed along the free stroke of the fixed cylinder. The piston cylinder is locked by a limiting mechanism. According to Pascal's theorem, the force of the small piston rod is amplified to the large piston rod through the piston cylinder, resulting in a greater output pressure. The combination of the above two improves work efficiency, outputs greater pressure, and avoids the problems of large size and high cost caused by hydraulic station pressure supply. Attached Figure Description

[0018] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of a specific embodiment of the present utility model.

[0020] Figure 2 This is a cross-sectional structural diagram of a specific embodiment of the present utility model.

[0021] Figure 3 for Figure 2 A magnified structural diagram of part A in the middle.

[0022] Figure 4 for Figure 2 A magnified structural diagram of section B in the middle.

[0023] In the attached diagram: 1. Frame, 2. Worktable, 3. Fixing plate, 4. First boss, 5. Guide rod, 6. Support plate, 7. Connecting plate, 8. Fixing cylinder, 9. Piston cylinder, 91. Small piston chamber, 92. Large piston chamber, 93. Small piston rod, 94. Large piston rod, 95. First check valve, 96. Second check valve, 97. Second boss, 10. Pressure head, 11. Limiting mechanism, 111. Limiting piston chamber, 112. Piston pin, 113. Pin groove, 12. Power mechanism, 121. Rotating shaft, 122. First bevel gear, 123. Lead screw, 124. Second bevel gear, 125. Rotating handle. Detailed Implementation

[0024] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0025] like Figure 1-4As shown, this utility model discloses a benchtop press with a hydraulic force-boosting mechanism, including a frame 1 and a worktable 2 connected and installed on the frame 1. A fixed plate 3 is connected and installed inside the upper side of the frame 1, and a first boss 4 is connected and installed on both inner walls of the fixed plate 1. A guide rod 5 is connected and installed between the fixed plate 3 and the first boss 4. A support plate 6 is slidably fitted on the guide rod 5. Two connecting plates 7 are connected and installed on the frame 1. A fixed cylinder 8 is connected and installed between the two connecting plates 7. A piston cylinder 9 is slidably connected and installed inside the fixed cylinder 8. The piston cylinder 9 has a small piston chamber 91 and a large piston chamber 92 on its upper and lower sides, respectively. A small piston rod 93 is slidably connected to the piston chamber 91 and fixedly connected to the support plate 6. A large piston rod 94 is slidably connected to the large piston chamber 92. A pressure head 10 is connected to the lower side of the large piston rod 94. A first check valve 95 that allows hydraulic oil to flow from the small piston chamber 91 to the large piston chamber 92 and a second check valve 96 that allows hydraulic oil to flow from the large piston chamber 92 to the small piston chamber 91 are connected and installed between the small piston chamber 91 and the large piston chamber 92. A limiting mechanism 11 that can support and lock the piston cylinder 9 is provided on the fixed cylinder 8. A protective cover is connected and installed on the outside of the frame 1 to prevent dust from contaminating the internal components.

[0026] It also includes a power mechanism 12 that can drive the support plate 6 to move up and down.

[0027] In use, the workpiece requiring interference fitting is placed on the worktable 2. The power mechanism 12 presses down the support plate 6, causing it to slide downwards along the guide rod 5, which in turn pushes the small piston rod 93 downwards. Since the pressure head 10 is not in contact with the workpiece, the small piston rod 93, along with the piston cylinder 9, slides downwards along the fixed cylinder 8. When the pressure head 10 contacts the workpiece, the support of the workpiece causes the large piston rod 94 to receive an upward supporting force, increasing the hydraulic oil pressure inside the large piston chamber 92 and the small piston chamber 91. Because the piston area of ​​the small piston rod 93 is smaller than that of the large piston rod 94, the hydraulic oil pressure in the small piston chamber 91 is greater than that in the large piston chamber 92, causing the hydraulic oil in the small piston chamber 91 to flow into the large piston chamber 92 through the first one-way valve 95. If the piston cylinder 9 is not limited, it will tend to move upwards along the fixed cylinder 8. However, the limiting mechanism 11 exerts a downward supporting force on the piston cylinder 9, preventing it from moving upwards. As the small piston rod 93 moves downward, hydraulic oil flows from the small piston chamber 91 to the large piston chamber 92. Then, the large piston rod 94 continues to move downward to press the workpiece. According to Pascal's law, the piston area is proportional to the pressure generated, so the pressure exerted on the workpiece by the large piston rod 94 through the pressure head 10 is greater than the pressure exerted on the small piston rod 93 by the power mechanism 12. When the workpiece pressing task is completed, the power mechanism 12 drives the support plate 6 upward, which in turn drives the small piston rod 93 upward. At this time, since the piston cylinder 9 is still locked by the lower support, the pressure in the small piston chamber 91 will be less than the pressure in the large piston chamber 92. Then, the hydraulic oil in the large piston chamber 92 will flow to the small piston chamber 91 through the second check valve 96. Then, the large piston rod 94 moves upward along the large piston chamber 92, causing the pressure head 10 to leave the workpiece. At this time, the limiting mechanism 11 releases the support lock on the piston cylinder 9, allowing the piston cylinder 9 to slide upward along the fixed cylinder 8 as the small piston rod 93 continues to move upward, ready for the next operation. This device uses a power mechanism 12 to drive the entire piston assembly to quickly approach the workpiece to be pressed along the free stroke of the fixed cylinder 8. The piston cylinder 9 is locked by a limiting mechanism 11. According to Pascal's theorem, the force of the small piston rod 93 is amplified to the large piston rod 94 through the piston cylinder 9, resulting in a greater output pressure. The combination of the above two improves work efficiency, outputs greater pressure, and avoids the problems of large size and high cost caused by hydraulic station pressure supply.

[0028] The limiting mechanism 11 includes several limiting piston chambers 111 that are evenly arranged around the piston cylinder 9 and communicate with the large piston chamber 92. A piston pin 112 is slidably connected and installed in the limiting piston chamber 111. The piston pin 112 is a pin provided at the end of the piston, so that the pin moves with the movement of the piston. The inner wall of the fixed cylinder 8 is provided with several pin grooves 113 arranged vertically in an array to correspond to the piston pin 112. When the large piston rod 94 moves downward and contacts the workpiece, the hydraulic oil pressure in the small piston chamber 91 and the large piston chamber 92 increases, which in turn pushes the piston pin 112 to slide outward along the limiting piston chamber 111, so that the piston pin 112 is inserted into the pin groove 113. Then the piston cylinder 9 cannot move upward, thus achieving the limiting and locking of the piston cylinder 9. This provides pressure to the large piston rod 94 from the power mechanism 12 on the small piston rod 93. After the workpiece is pressed, the small piston rod 93 rises, causing the hydraulic oil in the large piston chamber 92 to flow to the small piston chamber 91. This causes the piston pin 112 to slide inward along the limiting piston chamber 111 and be pulled out of the pin groove 113, releasing the locking of the piston cylinder 9 and allowing the piston cylinder 9 to move upward along the fixed cylinder 8.

[0029] It should be noted that the end of the piston pin 112 is wedge-shaped, so that after the piston cylinder 9 is in the limit position, the piston cylinder 9 can only move downward and cannot move upward. The limit piston cavity 111 is provided with a guide sleeve that can limit the rotation of the limit part of the piston pin 112, prevent the piston pin 112 from rotating and affecting the normal cooperation with the pin groove 113, and at the same time guide the piston pin 112.

[0030] The power mechanism 12 includes a rotating shaft 121 rotatably mounted on the upper side of the frame 1. First bevel gears 122 are connected to both sides of the rotating shaft 121. A lead screw 123, threadedly connected to the support plate 6, is rotatably mounted between the fixed plate 3 and the first boss 4. A second bevel gear 124, meshing with the first bevel gear 122, is connected to the end of the lead screw 123. A rotating handle 125, fixedly connected to the rotating shaft 121, is rotatably mounted on the outer side of the frame 1. In use, the operator rotates the rotating shaft 121 via the rotating handle 125, which in turn rotates the first bevel gear 122, causing the meshing second bevel gear 124 to rotate, which in turn rotates the lead screw 123. This drives the threaded support plate 6 to move upwards or downwards. Self-locking is achieved without the operator needing to continuously apply force, allowing the support plate 6 to remain in any position. Simultaneously, the threaded transmission between the lead screw 123 and the support plate 6 can output significant pressure.

[0031] It should be noted that the first bevel gear 122 can be located inside the second bevel gear 124. The two lead screws 123 need to be rotated in opposite directions to drive the support plate 6 to move up or down along the guide rod 5 at the same time. This can counteract the axial force of the rotating shaft 121 and avoid bearing wear.

[0032] The first one-way valve 95 is a sequence valve with a certain pressure threshold. When the pressure head 10 just contacts the workpiece, the force required to press the workpiece is small. There is no need for piston pressurization. The force required to press the workpiece can be provided by the lead screw 123 alone, so that the piston moves down as a whole and is still in the stage of rapidly approaching the workpiece, which improves work efficiency. When the pressure in the small piston chamber 91 exceeds a certain threshold, the hydraulic oil in the small piston chamber 91 will enter the large piston chamber 92. At this time, the limiting mechanism 11 has locked the piston cylinder 9, and then pushes the large piston rod 94 down to slowly press the workpiece with amplified pressure to ensure sufficient pressure.

[0033] The pressure head 10 is detachably connected to the large piston rod 94. Different sizes of pressure heads 10 can be replaced to better adapt to the workpiece and improve adaptability.

[0034] The small piston chamber 91 has a second protrusion 97 at its bottom. The second protrusion 97 can limit the lower limit position of the small piston rod 93, preventing the small piston rod 93 from being pressed to the limit during abnormal operation, thus affecting the normal operation of the first one-way valve 95 and the second one-way valve 96.

[0035] This benchtop press features a hydraulic force-boosting mechanism. It combines rapid idle stroke with hydraulic force-boosting principles. The specific working process is as follows:

[0036] Rapid approach phase: The power mechanism 12 drives the support plate 6 to move downward along the guide rod 5, causing the small piston rod 93 and piston cylinder 9 to slide rapidly down the fixed cylinder 8, making the pressure head 10 quickly approach the workpiece on the worktable 2. During this phase, the piston cylinder 9 is not locked, and the hydraulic oil does not participate in pressure amplification.

[0037] Contact and locking stage: When the pressure head 10 contacts the workpiece and encounters resistance, the oil pressure in the small piston chamber 91 and the large piston chamber 92 increases. The oil pressure pushes the piston pin 112 of the limiting mechanism 11 into the pin groove 113 of the fixed cylinder 8, locking the piston cylinder 9 and preventing it from moving upward.

[0038] Hydraulic force amplification stage: After piston cylinder 9 is locked, the small piston rod 93 continues to press down. Because the area of ​​the small piston rod 93 is smaller than that of the large piston rod 94, the oil pressure in the small piston chamber 91 is higher than that in the large piston chamber 92. According to Pascal's principle, the hydraulic oil in the small piston chamber 91 enters the large piston chamber 92 through the first check valve 95, pushing the large piston rod 94 to output pressure several times the input force, completing the workpiece pressing through the pressure head 10. The first check valve 95 is set as a sequence valve, which can only open after the pressure exceeds the threshold, avoiding accidental force amplification under low pressure conditions.

[0039] Return phase: After pressing is completed, the power mechanism 12 drives the small piston rod 93 to move upward. At this time, the oil pressure in the large piston chamber 92 is higher than that in the small piston chamber 91. The hydraulic oil flows back to the small piston chamber 91 through the second check valve 96, the large piston rod 94 retracts, and the press head 10 leaves the workpiece. At the same time, the limit mechanism 11 is unlocked, and the piston cylinder 9 moves upward along with the small piston rod 93, returning to its initial position, ready for the next operation.

[0040] It should be noted that oil leakage may occur between the piston cylinder and the piston after repeated use. To ensure the service life of this device, an oil filling hole can be added to the piston cylinder 9 to replenish hydraulic oil in a timely manner.

[0041] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A table press with a hydraulic force multiplier, comprising a frame (1) and a table (2) connected mounted on the frame (1), characterized in that, A fixing plate (3) is connected and installed inside the upper side of the frame (1), and a first boss (4) is connected and installed on both inner walls of the fixing plate (3) and the first boss (4). A guide rod (5) is connected and installed between the fixing plate (3) and the first boss (4). A support plate (6) is slidably fitted on the guide rod (5). Two connecting plates (7) are connected and installed on the frame (1). A fixing cylinder (8) is connected and installed between the two connecting plates (7). A piston cylinder (9) is slidably connected inside the fixing cylinder (8). The piston cylinder (9) has a small piston chamber (91) and a large piston chamber (92) on its upper and lower sides, respectively. The small piston chamber (91) is slidably connected to... A small piston rod (93) is fixedly connected to the support plate (6). A large piston rod (94) is slidably connected to the large piston chamber (92). A pressure head (10) is connected to the lower side of the large piston rod (94). A first check valve (95) that allows hydraulic oil to flow from the small piston chamber (91) to the large piston chamber (92) and a second check valve (96) that allows hydraulic oil to flow from the large piston chamber (92) to the small piston chamber (91) are connected and installed between the small piston chamber (91) and the large piston chamber (92). A limiting mechanism (11) that can support and lock the piston cylinder (9) is provided on the fixed cylinder (8). It also includes a power mechanism (12) that can drive the support plate (6) to move up and down.

2. Table press with hydraulic force multiplier according to claim 1, characterized in that The limiting mechanism (11) includes several limiting piston chambers (111) that are evenly arranged around the piston cylinder (9) and communicate with the large piston chamber (92). A piston pin (112) is slidably connected and installed in the limiting piston chamber (111). Several pin grooves (113) corresponding to the piston pins (112) are arranged in a vertical array on the inner wall of the fixed cylinder (8).

3. Table press with hydraulic force multiplier according to claim 1, characterized in that The power mechanism (12) includes a rotating shaft (121) rotatably connected to the upper side of the frame (1), a first bevel gear (122) connected to both sides of the rotating shaft (121), a lead screw (123) rotatably connected to the fixed plate (3) and the first boss (4) and threadedly connected to the support plate (6), a second bevel gear (124) meshing with the first bevel gear (122) connected to the end of the lead screw (123), and a rotating handle (125) rotatably connected to the rotating shaft (121) fixedly connected to the outer side of the frame (1).

4. Table press with hydraulic force multiplier according to claim 3, characterized in that The first check valve (95) is a sequence valve with a certain pressure threshold.

5. The benchtop press with a hydraulic force-boosting mechanism according to claim 1, characterized in that, The pressure head (10) is detachably connected to the large piston rod (94).

6. The benchtop press with a hydraulic force-boosting mechanism according to claim 1, characterized in that, The bottom of the small piston chamber (91) is provided with a second protrusion (97).

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