Slowly-ascending and slowly-descending sample pressing machine
Through the slow rise and fall function designed by the hydraulic system, the problem of sample rupture during gas discharge and mold release during pressing is solved, and the stability and safety of the prototype press is achieved.
Patent Information
- Application Number
- CN202510768968.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-10
- Publication Date
- 2025-09-02
AI Technical Summary
In the existing sample compression technology, the pressing speed is too fast, resulting in the inability to effectively discharge the powder gap gas, increasing the sample porosity, and the demolding speed is too fast, resulting in hollow rupture of the sample.
The hydraulic system design is adopted, including oil cylinder, oil pump, reversing valve, bidirectional shut-off valve, bypass pipe, pressurized speed control throttle valve and pressure relief speed control throttle valve to realize the rapid rise and fall of the oil cylinder and the slow rise and fall function, and the stability and safety of the prototype press are achieved through the control of the hydraulic system.
It effectively solves the problem of gas discharge during the pressing process, avoids sample porosity increases and sample rupture during demolding, and improves the stability and safety of the compressor.
Smart Images
Figure CN120572789A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of prototype pressing machines, and in particular to a prototype pressing machine capable of slowly rising and falling. Background Art
[0002] Existing sample pressing technologies suffer from the following drawbacks: Excessively fast pressing speeds during the pressing phase prevent effective evacuation of interstitial gas from the powder, increasing sample porosity; and excessively fast release speeds during the demolding phase lead to hollow, fractured samples. Therefore, a new press machine is needed to overcome these drawbacks. Summary of the Invention
[0003] In view of the defects in the prior art, the present invention provides a slowly rising and falling prototype pressing machine.
[0004] The present invention is achieved through the following technical solutions: A slowly rising and falling press machine includes a press machine body, which is driven by an oil cylinder. A hydraulic system is provided in the press machine body. The hydraulic system includes an oil cylinder and an oil pump. The oil pump is connected to the P port of the reversing valve through an oil inlet pipe. The A port of the reversing valve is connected to the lower chamber of the oil cylinder through a pipeline. A two-way stop valve is provided on the pipeline between the A port of the reversing valve and the lower chamber of the oil cylinder. A bypass pipe is provided on the pipeline between the two-way stop valve and the reversing valve. The other end of the bypass pipe is connected to the two-way stop valve and the lower chamber of the oil cylinder. On the pipeline between them, a one-way valve and a pressure-regulating throttle valve are sequentially provided from one end of the bypass pipe to the other end. A pressure-reducing speed-regulating throttle valve and a one-way stop valve are sequentially connected from the pressure-regulating speed-regulating throttle valve to the other end of the bypass pipe through a pipeline, and the one-way stop valve is connected to an oil return pipe; the upper chamber of the oil cylinder is connected to the B port of the reversing valve through a pipeline, and the T port of the reversing valve is connected to the oil return pipe. A branch pipe is provided on the pipeline between the upper chamber of the oil cylinder and the B port, and the other end of the branch pipe is connected to the oil return pipe, and a cylinder downward overflow valve is provided on the branch pipe.
[0005] Preferably, a pressure system overflow valve is provided between the oil inlet pipe and the oil return pipe through a pipeline.
[0006] Preferably, the reversing valve is a three-position four-way reversing valve.
[0007] Preferably, a pressure gauge is connected to the pipeline between the lower chamber of the oil cylinder and the two-way stop valve.
[0008] Preferably, a pressure transmitter is provided at the pressure relief speed regulating throttle valve.
[0009] Preferably, an oil suction filter is provided at the inlet end of the oil pump.
[0010] Preferably, an oil return filter is provided on the oil return pipe.
[0011] Preferably, the outlet end of the oil return pipe is connected to the pipeline between the oil suction filter and the oil pump.
[0012] The beneficial effects of the present invention are as follows: the present invention can realize the rapid rise and fall as well as the slow rise and fall functions of the oil cylinder through the hydraulic system design. The pressure system relief valve and the oil cylinder downward relief valve of the present invention ensure the stability and safety of the hydraulic system. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.
[0014] Figure 1 It is a structural diagram of the hydraulic system of the present invention.
[0015] Figure 2 It is the front view of the prototype pressing machine body of the present invention.
[0016] In the attached figure, 1. oil pump; 2. reversing valve; 3. two-way stop valve; 4. oil inlet pipe; 5. oil cylinder; 6. pressure gauge; 7. bypass pipe; 8. one-way valve; 9. pressurization speed regulating throttle valve; 10. pressure transmitter; 11. pressure relief speed regulating throttle valve; 12. one-way stop valve; 13. oil return pipe; 14. oil cylinder downward overflow valve; 15. pressurization system overflow valve; 16. oil suction filter; 17. oil return filter; 18. storage table; 19. touch screen; 20. button. DETAILED DESCRIPTION
[0017] The following description sets forth numerous specific details to facilitate a thorough understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.
[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0019] The present invention is described in detail below: A slow rising and falling pressing machine of the present invention includes a pressing machine body, a storage platform 18 is provided on one side of the pressing machine body, a touch screen 19 and a button 20 are provided on the pressing machine body for controlling the pressing machine body, and the functions of the button 20 include start, power, stop / pressure relief and demolding. An electrical door is provided on the side wall of the pressing machine for opening and repairing internal components, and a foot is provided at the bottom of the pressing machine body. The prototype pressing machine body is driven by the oil cylinder 5 to realize the tablet pressing function. The prototype pressing machine body is provided with a hydraulic system, which includes an oil cylinder 5 and an oil pump 1. The oil pump 1 is connected to the P port of the reversing valve 2 through an oil inlet pipe 4. The reversing valve 2 is a three-position four-way reversing valve 2. The A port of the reversing valve 2 is connected to the lower cavity of the oil cylinder 5 through a pipeline. A two-way stop valve 3 is provided on the pipeline between the A port of the reversing valve 2 and the lower cavity of the oil cylinder 5. The two-way stop valve 3 is an electromagnetic two-way stop valve 3. A bypass pipe 7 is provided on the pipeline between the two-way stop valve 3 and the reversing valve 2. The other end of the through pipe 7 is connected to the pipeline between the two-way stop valve 3 and the lower chamber of the oil cylinder 5. A one-way valve 8 and a pressure-increasing speed-regulating throttle valve 9 are sequentially provided from one end to the other end of the bypass pipe 7. A pressure-reducing speed-regulating throttle valve 11 and a one-way stop valve 12 are sequentially connected between the pressure-increasing speed-regulating throttle valve 9 and the other end of the bypass pipe 7 through a pipeline. The one-way stop valve 12 is an electromagnetic one-way stop valve 12, and a return oil pipe 13 is connected to the one-way stop valve 12; the upper chamber of the oil cylinder 5 is connected to the B port of the reversing valve 2 through a pipeline, and the T port of the reversing valve 2 is connected to the return oil pipe 13.
[0020] A branch pipe is provided on the pipeline between the upper chamber of the oil cylinder 5 and port B. The other end of the branch pipe is connected to the oil return pipe 13. A downward relief valve for the oil cylinder 5 is installed on the branch pipe to ensure stable system pressure during the downward movement of the oil cylinder 5. A pressurized system relief valve 15 is installed in the pipeline between the oil inlet pipe 4 and the oil return pipe 13 to ensure stable system pressure during the upward movement of the oil cylinder 5.
[0021] A pressure gauge 6 is connected to the pipeline between the lower chamber of the oil cylinder 5 and the two-way stop valve 3, and a pressure transmitter 10 is provided at the pressure relief speed regulating throttle valve 11 for detecting the pressure value of the lower chamber of the oil cylinder.
[0022] An oil suction filter 16 is provided at the inlet end of the oil pump 1. An oil return filter 17 is provided on the oil return pipe 13.
[0023] The outlet end of the oil return pipe 13 is connected to the pipeline between the oil suction filter 16 and the oil pump 1 .
[0024] The working principle of the present invention is: When the oil cylinder 5 rises rapidly, the solenoid valve on the right side of the reversing valve 2 is energized, the two-way stop valve 3 is energized, and the one-way stop valve 12 is not energized. The hydraulic oil is pumped from the P port to the A port through the oil pump 1, and the hydraulic oil is then pumped to the lower chamber of the oil cylinder 5 through the two-way stop valve 3, thereby pushing the piston rod to rise. At the same time, the hydraulic oil also flows to the lower chamber of the oil cylinder 5 through the bypass pipe 7, and the hydraulic oil in the upper chamber of the oil cylinder 5 flows through the pipeline through the B port and T port of the reversing valve 2 to the return oil pipe 13 for return oil.
[0025] When cylinder 5 is slowly rising, power is removed from both two-way shutoff valve 3 and one-way shutoff valve 12. Hydraulic oil can only be pumped from port A through bypass pipe 7 to the lower chamber of cylinder 5. Due to the installation of pressure-controlled throttle valve 9, the flow rate through bypass pipe 7 is low, thus achieving the slow-rise function. After cylinder 5 slowly rises to the designated position, oil pump 1 stops operating. Since power is removed from both two-way shutoff valve 3 and one-way shutoff valve 12, and the one-way valve 8 installed on bypass pipe 7 maintains pressure, cylinder 5 stops operating.
[0026] When the oil cylinder 5 is slowly lowered, since the lower chamber of the pressing machine body itself has pressure, the two-way stop valve 3 is de-energized and the one-way stop valve 12 is energized. At this time, the hydraulic oil can flow from the lower chamber of the oil cylinder through the pressure relief speed regulating throttle valve 11 and the one-way stop valve 12 to the return oil pipe 13, realizing the slow lowering function.
[0027] As an alternative solution, when the cylinder 5 is slowly lowered, the solenoid valve on the left side of the reversing valve 2 is energized, the two-way stop valve 3 is not energized, and the one-way stop valve 12 is energized. The hydraulic oil enters the reversing valve 2 from the P port through the oil pump 1, and is then pumped to the upper chamber of the cylinder 5 through the B port. The hydraulic oil in the lower chamber of the cylinder 5 can only reach the pressure relief and speed regulating throttle valve 11 through the pipeline and then return to the oil return pipe 13 through the one-way stop valve 12. Since the flow rate of the pressure relief and speed regulating throttle valve 11 is small, the slow lowering function is achieved.
[0028] When the oil cylinder 5 descends rapidly, the solenoid valve on the left side of the reversing valve 2 is energized, the two-way stop valve 3 is energized, and the one-way stop valve 12 can be energized or not. The hydraulic oil enters the reversing valve 2 from the P port through the oil pump 1, and is then pumped to the upper chamber of the oil cylinder 5 through the B port. At the same time, the hydraulic oil in the lower chamber of the oil cylinder 5 flows to the two-way stop valve 3 through the pipeline, and then enters the T port from the A port of the reversing valve 2 and flows out into the return oil pipe 13 for return oil.
[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.
Claims
1. A slowly rising and lowering press, comprising a press body, the press body being driven by an oil cylinder (5), a hydraulic system being provided in the press body, the hydraulic system comprising an oil cylinder (5) and an oil pump (1), and characterized in that: The oil pump (1) is connected to the P port of the reversing valve (2) through the oil inlet pipe (4), and the A port of the reversing valve (2) is connected to the lower chamber of the oil cylinder (5) through a pipeline. A two-way stop valve (3) is provided on the pipeline between the A port of the reversing valve (2) and the lower chamber of the oil cylinder (5). A bypass pipe (7) is provided on the pipeline between the two-way stop valve (3) and the reversing valve (2). The other end of the bypass pipe (7) is connected to the pipeline between the two-way stop valve (3) and the lower chamber of the oil cylinder (5). A one-way valve (8) and a pressure-increasing speed-regulating throttle valve (9) are sequentially provided from one end of the bypass pipe (7) to the other end. A pressure-reducing speed-regulating throttle valve (11) and a one-way stop valve (12) are sequentially connected through a pipeline between the pressure-increasing speed-regulating throttle valve (9) and the other end of the bypass pipe (7). The one-way stop valve (12) is connected to an oil return pipe (13). The upper chamber of the oil cylinder (5) is connected to the B port of the reversing valve (2) through a pipeline, and the T port of the reversing valve (2) is connected to the oil return pipe (13).
2. The slow-rising and slow-falling prototype pressing machine according to claim 1, characterized in that: A pressure system overflow valve (15) is provided between the oil inlet pipe (4) and the oil return pipe (13) via a pipeline.
3. The slow-rising and slow-falling prototype pressing machine according to claim 1, characterized in that: A branch pipe is provided on the pipeline between the upper chamber of the oil cylinder (5) and the B port, the other end of the branch pipe is connected to the oil return pipe (13), and a downward overflow valve of the oil cylinder (5) is provided on the branch pipe.
4. The slow-rising and slow-falling prototype pressing machine according to claim 1, characterized in that: The reversing valve (2) is a three-position four-way reversing valve (2).
5. The slow-rising and slow-falling prototype pressing machine according to claim 1, characterized in that: A pressure gauge (6) is connected to the pipeline between the lower chamber of the oil cylinder (5) and the two-way stop valve (3).
6. The slow-rising and slow-falling prototype pressing machine according to claim 1, characterized in that: A pressure transmitter (10) is provided at the pressure relief speed regulating throttle valve (11).
7. The slow-rising and slow-falling prototype pressing machine according to claim 1, characterized in that: An oil suction filter (16) is provided at the inlet end of the oil pump (1).
8. The slow-rising and slow-falling prototype pressing machine according to claim 1, characterized in that: An oil return filter (17) is provided on the oil return pipe (13).
9. The slow-rising and slow-falling prototype pressing machine according to claim 6, characterized in that: The outlet end of the oil return pipe (13) is connected to the pipeline between the oil suction filter (16) and the oil pump (1).