A position limiting device for a moving worktable of a press

Abstract

The application discloses a limiting device of a moving workbench of a press machine, which comprises a track laid on the ground and a press machine workbench moving along the track, and a buffer limiting mechanism is arranged at the end of the track; the buffer limiting mechanism comprises a buffer unit, a hydraulic unit and a jacking limiting unit connected in sequence; the buffer unit can be driven by the press machine workbench. The innovative buffer-hydraulic-jacking linkage mechanism realizes efficient limiting protection and hidden safety protection of the moving workbench of the press machine, and no additional power source is needed; when the workbench runs to the end of the track, the buffer unit is triggered to convert the impact kinetic energy into hydraulic energy, drives the limiting rod hidden underground to rise accurately and forms a rigid block; the unique sealed hydraulic system and the modular design not only realize step-by-step absorption of impact energy, but also ensure that all components are completely hidden in the non-working state.

Description

Technical Field

[0001] The present invention relates to the technical field of stamping automation technology for presses, and particularly to a limiting device for a moving workbench of a press. Background Art

[0002] The press is the core equipment in the fields of metal forging and stamping processing, and is widely used in industries such as automobile manufacturing, machining of mechanical parts, and hardware forming. The moving workbench is a key supporting structure for medium and large presses to achieve rapid die change and convenient loading and unloading. It completes the station docking with the main body of the press by horizontally moving on the track, and realizes the positioning and locking of the workbench through the vertical lifting action, greatly improving the production operation efficiency and automation degree of the press.

[0003] The limiting device is the core component for the moving workbench to achieve precise positioning and prevent over-travel in the horizontal direction. It is usually installed at the terminal position of the workbench moving track and directly abuts against the end of the workbench to achieve mechanical limiting after the workbench moves in place. At present, the limiting blocks supporting the moving workbench of conventional medium and large presses in the industry generally adopt a fixed rigid structure, which is directly fixedly installed on the ground foundation or the track base. The main body of the limiting block always protrudes from the equipment operation ground and is in a standing limiting state. At the same time, most of the existing limiting devices use electric push rods, cylinders, and independent hydraulic stations to drive the block to lift, which requires supporting power lines and control systems, with high costs, complex pipeline layouts, high failure rates in multi-dust and humid industrial environments, and great maintenance difficulties.

[0004] Therefore, it is necessary to design a limiting device for a moving workbench of a press to solve the above problems. Summary of the Invention

[0005] The object of the present invention is to propose a limiting device for a moving workbench of a press in view of the problems of the existing limiting device affecting passage and requiring additional power.

[0006] The technical solution of the present invention is: a limiting device for a moving workbench of a press, including a track laid on the ground and a press workbench moving along the track, and a buffer limiting mechanism is provided at the end of the track; the buffer limiting mechanism includes a buffer unit, a hydraulic unit, and a jacking limiting unit connected in sequence; the buffer unit can be driven by the contact of the press workbench; the hydraulic unit includes a sealed fluid cavity and an incompressible fluid disposed in the fluid cavity; the jacking limiting unit includes a liftable limiting rod; the buffer unit is linked with the fluid cavity. When the press workbench moves to the end of the track, the buffer unit is pushed to compress the fluid cavity, so that the incompressible fluid enters the jacking limiting unit to drive the limiting rod to rise.

[0007] The buffer unit includes a buffer slider, a push rod, and a piston; the buffer slider is slidably connected to a track; the piston is located inside a fluid cavity; one end of the push rod is fixedly connected to the slider, and the other end is sealed and extended into the fluid cavity and fixedly connected to the piston. This invention utilizes the kinetic energy of the worktable itself as a driving source, eliminating the need for external power, thus saving energy and improving system reliability.

[0008] A buffer / reset spring is sleeved on the push rod; one end of the buffer / reset spring abuts against the slider, and the other end abuts against the outer shell of the fluid cavity. The spring not only buffers energy dissipation but also resets the push rod.

[0009] The initial position of the limiting rod of the lifting and limiting unit is completely hidden below the ground, and after being lifted, it can be contacted by the press worktable, thus not affecting passage.

[0010] The lifting and limiting unit also includes a base and a lifting cavity disposed on the base; the bottom of the limiting rod is slidably connected to the lifting cavity through a lifting block, and the top of the limiting rod extends out of the lifting cavity; the base is provided with a hydraulic cavity communicating with the lifting cavity; the hydraulic cavity is connected to the fluid cavity through a pipeline.

[0011] The top and bottom of the lifting cavity are provided with limiting steps that limit the lifting block, thereby ensuring the structural strength of the limiting rod and thus ensuring the stability of the lifting block's movement.

[0012] The limiting rod has a contact surface on the side facing the press worktable that contacts the press worktable; an elastic pad is provided on the contact surface, which not only provides good protection for the limiting rod, but also has the function of reducing noise.

[0013] The press worktable is slidably connected to the track via a press slider; the contact surface between the buffer slider and the press slider is provided with elastic buffer protrusions.

[0014] The pipeline connecting the fluid chamber and the hydraulic chamber is provided with evenly distributed energy-dissipating protrusions, which can further convert the force exerted by the press table on the buffer unit into the heat energy of the fluid, thereby playing a certain protective role for the buffer unit.

[0015] By adopting the above technical solution, the present invention has the following beneficial effects: The present invention achieves efficient limit protection and concealed safety protection for the moving worktable of the press through an innovative buffer-hydraulic-lifting linkage mechanism, without the need for additional power energy: When the worktable runs to the end of the track, the buffer unit is triggered to convert the impact kinetic energy into hydraulic energy, driving the limit rod hidden underground to rise precisely and form a rigid block; The unique sealed hydraulic system and modular design not only achieve the step-by-step absorption of impact energy, but also ensure that all components are completely hidden in the non-working state, completely eliminating the safety hazards of traditional fixed blocks, while also having an automatic reset function and super impact resistance, making it particularly suitable for the high-frequency, high-load working conditions of heavy presses, and simultaneously completing the triple functions of buffering energy absorption, position limitation, and not affecting other machines without external energy consumption. Attached Figure Description

[0016] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the structure of the present invention.

[0018] Figure 2 This is a side view of the present invention.

[0019] Figure 3 This is a schematic diagram of the limiting state of the present invention.

[0020] Figure 4 This is a schematic diagram of the lifting and limiting unit of the present invention.

[0021] The labels in the attached diagram are:

[0022] 1. Track, 2. Press machine worktable, 3. Buffer limit mechanism, 3-1. Buffer unit, 3-1-1. Buffer slider, 3-1-1. Push rod, 3-1-2. Piston, 3-1-3. Buffer / reset spring, 3-1-4. Buffer protrusion, 3-1-5. Hydraulic unit, 3-2. Lifting limit unit, 3-3. Limit rod, 3-3-1. Base, 3-3-2. Lifting cavity, 3-3-3. Lifting block, 3-3-4. Contact plane, 3-3-5. Energy dissipation protrusion, 3-3-6. Detailed Implementation

[0023] (Example 1)

[0024] See Figures 1 to 4This embodiment provides a limiting device for a moving worktable of a press, including a track 1 laid on the ground and a press worktable 2 moving along the track 1. A buffer limiting mechanism 3 is provided at the end of the track 1. The buffer limiting mechanism 3 includes a buffer unit 3-1, a hydraulic unit 3-2, and a lifting limiting unit 3-3 connected in sequence. The buffer unit 3-1 can be driven by contact with the press worktable 2. The hydraulic unit 3-2 includes a sealed fluid cavity and an incompressible fluid disposed within the fluid cavity. The lifting limiting unit 3-3 includes a lifting limit rod 3-3-1. The buffer unit 3-1 is linked to the fluid cavity. When the press worktable 2 moves to the end of the track 1, the buffer unit 3-1 is pushed to compress the fluid cavity, causing the incompressible fluid to enter the lifting limiting unit 3-3 and drive the limit rod 3-3-1 to rise.

[0025] Furthermore, the buffer unit 3-1 includes a buffer slider 3-1-1, a push rod 3-1-2, and a piston 3-1-3; the buffer slider 3-1-1 is slidably connected to the track 1; the piston 3-1-3 is disposed within the fluid cavity; one end of the push rod 3-1-2 is fixedly connected to the slider, and the other end is sealed and extends into the fluid cavity, fixedly connected to the piston 3-1-3. This invention utilizes the kinetic energy of the worktable itself as a driving source, eliminating the need for external power, thus saving energy and improving system reliability.

[0026] Furthermore, a buffer / reset spring 3-1-4 is sleeved on the push rod 3-1-2; one end of the buffer / reset spring 3-1-4 abuts against the slider, and the other end abuts against the outer shell of the fluid cavity. The spring of the buffer / reset spring 3-1-4 not only has the function of buffering energy dissipation, but also plays a role in resetting the push rod 3-1-2.

[0027] Furthermore, the initial position of the limiting rod 3-3-1 of the lifting and limiting unit 3-3 is completely hidden below the ground, and after being lifted, it can be contacted by the press worktable 2. Thus, it does not affect passage.

[0028] Furthermore, the lifting and limiting unit 3-3 also includes a base 3-3-2 and a lifting cavity 3-3-3 disposed on the base 3-3-2; the bottom of the limiting rod 3-3-1 is slidably and sealed to the lifting cavity 3-3-3 through the lifting block 3-3-4, and the top of the limiting rod 3-3-1 extends out of the lifting cavity 3-3-3; the base 3-3-2 is provided with a hydraulic cavity communicating with the lifting cavity 3-3-3; the hydraulic cavity is connected to the fluid cavity through a pipeline.

[0029] Furthermore, the inner top and inner bottom of the lifting cavity 3-3-3 are provided with limiting steps that limit the lifting block 3-3-4, thereby ensuring the structural strength of the limiting rod 3-3-1 and thus ensuring the stability of the movement of the lifting block 3-3-4.

[0030] Furthermore, the limiting rod 3-3-1 has a contact surface 3-3-5 on the side facing the press worktable 2, which contacts the press worktable; the contact surface 3-3-5 is provided with an elastic pad, which not only provides good protection for the limiting rod 3-3-1, but also has the function of reducing noise.

[0031] The press worktable 2 is slidably connected to the track 1 via the press slider; the buffer slider 3-1-1 has elastic buffer protrusions 3-1-5 on the contact surface with the press slider.

[0032] The pipeline connecting the fluid chamber and the hydraulic chamber is provided with evenly distributed energy-dissipating protrusions 3-3-6, which can further convert the force exerted by the press worktable 2 on the buffer unit 3-1 into the heat energy of the fluid, thereby providing a certain degree of protection for the buffer unit 3-1.

[0033] The working principle of this embodiment is as follows: When the press worktable 2 moves to the end of the track 1, the worktable slider pushes the buffer slider 3-1-1 to slide along the track 1. The buffer slider 3-1-1 drives the push rod 3-1-2 to push the piston 3-1-3 to compress the incompressible fluid in the fluid chamber. The pressurized fluid enters the hydraulic chamber of the lifting limit unit 3-3 through the pipeline, pushing the limit rod 3-3-1 to rise from below the ground to form a rigid limit. When the worktable retracts, the buffer / reset spring 3-1-4 pushes the push rod 3-1-2 to reset, and the fluid backflow causes the limit rod 3-3-1 to fall back below the ground.

[0034] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A limiting device for a moving worktable of a press, comprising a track (1) laid on the ground and a press worktable (2) moving along the track (1), characterized in that: The end of the track (1) is provided with a buffer limiting mechanism (3); the buffer limiting mechanism (3) includes a buffer unit (3-1), a hydraulic unit (3-2) and a lifting limiting unit (3-3) connected in sequence; the buffer unit (3-1) can be driven by contact with the press worktable (2); the hydraulic unit (3-2) includes a sealed fluid cavity and an incompressible fluid disposed in the fluid cavity; the lifting limiting unit (3-3) includes a limit rod (3-3-1) that can move up and down; the buffer unit (3-1) is linked to the fluid cavity, and when the press worktable (2) moves to the end of the track (1), the buffer unit (3-1) is pushed to compress the fluid cavity, so that the incompressible fluid enters the lifting limiting unit (3-3) and drives the limit rod (3-3-1) to rise.

2. The limiting device for a moving worktable of a press according to claim 1, characterized in that: The buffer unit (3-1) includes a buffer slider (3-1-1), a push rod (3-1-2), and a piston (3-1-3); the buffer slider (3-1-1) is slidably connected to the track (1); the piston (3-1-3) is located in the fluid cavity; one end of the push rod (3-1-2) is fixedly connected to the slider, and the other end is sealed and extended into the fluid cavity and fixedly connected to the piston (3-1-3).

3. The limiting device for a moving worktable of a press according to claim 2, characterized in that: A buffer / reset spring (3-1-4) is sleeved on the push rod (3-1-2); one end of the buffer / reset spring (3-1-4) abuts against the slider, and the other end abuts against the outer shell of the fluid cavity.

4. The limiting device for a moving worktable of a press according to claim 1, characterized in that: The initial position of the limiting rod (3-3-1) of the lifting limiting unit (3-3) is completely hidden below the ground, and after being lifted, it can be contacted by the press worktable (2).

5. The limiting device for a moving worktable of a press according to claim 1, characterized in that: The lifting and limiting unit (3-3) also includes a base (3-3-2) and a lifting cavity (3-3-3) provided on the base (3-3-2); the bottom of the limiting rod (3-3-1) is slidably and sealed in the lifting cavity (3-3-3) through the lifting block (3-3-4), and the top of the limiting rod (3-3-1) extends out of the lifting cavity (3-3-3); the base (3-3-2) is provided with a hydraulic cavity communicating with the lifting cavity (3-3-3); the hydraulic cavity is connected to the fluid cavity through a pipeline.

6. The limiting device for a moving worktable of a press according to claim 5, characterized in that: The inner top and inner bottom of the lifting cavity (3-3-3) are provided with limiting steps that limit the lifting block (3-3-4).

7. The limiting device for a moving worktable of a press according to claim 1, characterized in that: The limiting rod (3-3-1) has a contact plane (3-3-5) on the side facing the press worktable (2) that contacts the press worktable; an elastic pad is provided on the contact plane (3-3-5).

8. A limiting device for a moving worktable of a press according to claim 2, characterized in that: The press worktable (2) is slidably connected to the track (1) via the press slider; the buffer slider (3-1-1) has elastic buffer protrusions (3-1-5) on the contact surface with the press slider.

9. A limiting device for a moving worktable of a press according to claim 5, characterized in that: The pipeline connecting the fluid cavity and the hydraulic cavity is provided with evenly distributed energy-dissipating protrusions (3-3-6).

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