Two-stage speed control

Abstract

The present invention provides a two-stage speed control device that controls the operating speed of a pneumatic cylinder in multiple stages, making the adjustment and control operation of the regulating unit more intuitive. The device comprises a main body 10 having a first port 15 and a second port 16 that communicate with each other, and a main passage 11 and a sub-passage 40 for passing fluid. The sub-passage flows in one direction to a pressure accumulator 13, a slide shaft seat 14 is fitted into the second port, and a valve 50 is formed by one end of a slide shaft unit 20 and the slide shaft seat, the pressure accumulator communicates with a main hole passage 12, and a sub-flow hole passage 231 is provided laterally in the slide shaft unit, so that when fluid is sucked in and exhausted, each passage and the valve work together to control the fluid pressure according to the strength of the elastic force of the adjustment unit 30. Thus, the moving speed of the cylinder connected to the main body is adjusted, thereby achieving the purpose of cushioning when the second port is exhausted.

Description

[Technical field]

[0001] The present invention relates to the technical field of speed control devices, and more particularly to a two-stage speed control device that controls the operating speed of a pneumatic cylinder in multiple stages through the flow path and structural design within the two-stage speed control device, making it possible to more intuitively adjust and control the operation of the regulating unit. [Background technology]

[0002] Generally, pneumatic cylinders are very common equipment in automated production operations. However, pneumatic cylinders usually undergo repeated reciprocating motions for a long time, so there are many auxiliary products on the market designed and applied to cushion pneumatic cylinders, thereby reducing the sudden rise in working temperature caused by the reciprocating motions and the impact damage to the structure due to lack of cushioning.

[0003] For example, it can be understood from the patent contents of "Delay Time and Flow Control Device" of Taiwan Patent No. I783287 that the disclosed flow control device needs to be combined with a pneumatic cylinder of a specific model number, so that the environmental conditions inside the pneumatic cylinder can be ensured and the maximum performance can be achieved under specific parameters and environments. The purpose of buffering is mainly achieved by switching the guiding fluid, combining a mutually corresponding compensation mechanism, and guiding the branched fluid to the opposite flow path in the compensation mechanism and discharging it by a needle valve. However, in order to realize the related flow adjustment, a large amount of additional equipment purchase costs are required, and further, since the design of the flow control device is complicated, even after purchase, more precise calibration is required, and it cannot be universally used for the same model number arrangement, and can only be applied to the currently connected pneumatic cylinder, so the whole assembly is very difficult.

[0004] Further, please refer to the "Speed ​​Control Device" of Taiwan Patent No. I604132. As can be seen from the disclosure therein, the speed control device has multiple flow paths inside the structure, which allows the relevant fluid to be processed by division, and furthermore, the high-speed and low-speed switching is performed by exhausting through a needle valve, which makes the buffer function more effective, but also makes the structure more complicated, which makes the overall volume considerably larger.

[0005] Therefore, although many improvements have been made to the conventional patents, the structural technology has many limitations in terms of use, and the assembly cost is not low, so the inventor continues to research and make improvements. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Taiwan Patent No. I783287 Specification [Patent Document 2] Taiwan Patent No. I604132 Specification Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention aims to provide a two-stage speed control device in which a main body is provided with a first port and a second port for passing a fluid, a slide shaft unit, an adjustment unit, and a plurality of passages (main passage, sub passage, balance passage, main hole passage, sub flow hole passage) are further provided inside the main body, the sub passage allows a unidirectional flow to reach a pressure accumulator chamber, the slide shaft unit is formed by drilling an elastic part and a counter shaft part in that order into one end of a main shaft part, and then fitting one end of the main shaft part to an inner wall of the main body, a balance passage is formed between the main shaft part and the counter shaft part, an adjustment unit formed by connecting a rotary knob connecting part and an adjustment rotary knob is disposed at the other end of the main shaft part, a slide shaft base is fitted into the second port, and a valve is formed by combining the counter shaft part with the slide shaft base.

[0008] Another object of the present invention is to provide a two-stage speed control device in which, when the main body is in a state of rapid exhaust, the adjustment unit adjusts the elastic force of the elastic part via the adjustment rotary knob and the rotary knob connecting part, thereby limiting the position of the valve where the slide shaft unit closes, thereby adjusting the buffer position inside the cylinder connected to the main body.

[0009] Another object of the present invention is to provide a two-stage speed control device in which a throttle is further provided inside the mainstream hole passage, and a value obtained by subtracting a cross-sectional area of ​​the throttle from a cross-sectional area of ​​the mainstream hole passage is between 1% and 7% of the area of ​​the mainstream hole passage, so that the throttle of a different cross-sectional area affects the pressure drop in the accumulator chamber to close the valve, and further affects the buffer position of the cylinder.

[0010] Another object of the present invention is to provide a two-stage speed control device in which the ratio of the area of ​​the valve to the area of ​​the balance passage is between 1:1 and 1:4, thereby preventing the valve 50 from opening when the slide shaft unit is pushed back.

[0011] It is a further object of the present invention to provide a two-stage speed control device in which the diameter of the side flow hole passage is between 0.2 and 0.4 mm, and by using different diameters, the exhaust action of the cylinder can be slowed down depending on the displacement of the passage. [Means for solving the problem]

[0012] The accumulator communicates with the main hole passage, and the countershaft part is provided with a side flow hole passage extending laterally. When the fluid flows from the first port and the valve is closed, the fluid passes through the main passage, the balance passage, the side passage, the main hole passage, and the side flow hole passage, and flows to the outside from the second port. This causes the slide shaft unit to start moving upward and open the valve. When the fluid continues to pass through the valve and circulates from the side flow hole passage, the valve continues to be opened upward by the slide shaft unit, and the cylinder connected to the main body is driven to move forward at a two-stage speed of initial acceleration and high speed. When the cylinder returns and is rapidly exhausted with the valve open, the fluid passes through all the above-mentioned passages and flows to the first port, so that the slide shaft unit can gradually move downward and close the valve. Furthermore, the fluid passes through the main flow hole passage and the side flow hole passage, and is adjusted to move the slide shaft unit downward and completely close the valve to decelerate, thereby mitigating the impact of the return movement of the cylinder and preventing a sudden rise in the temperature of the cylinder. Effect of the Invention

[0013] Therefore, not only can the complex structure of related products available on the market be simplified, but the purpose of controlling the internal pressure of the pressure accumulator chamber can be achieved by adjusting the elastic force more intuitively, which can greatly reduce restrictions on installation conditions and can be applied to different cylinders from different manufacturers. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a perspective view of the present invention. [Diagram 2] FIG. [Diagram 3] FIG. 2 is a diagram showing a preparation state of the main body according to the present invention. [Figure 4] FIG. 4 is a control circuit diagram according to FIG. 3 of the present invention. [Diagram 5] FIG. 4 is a diagram showing an initial intake acceleration state of the main body in the present invention. [Figure 6] FIG. 6 is a control circuit diagram according to FIG. 5 of the present invention. [Figure 7] FIG. 13 is a diagram showing a high speed intake state of the main body in the present invention. [Figure 8] FIG. 8 is a control circuit diagram according to FIG. 7 of the present invention. [Figure 9] FIG. 2 is a diagram showing a rapid exhaust high speed state of the main body in the present invention. [Figure 10] FIG. 10 is a control circuit diagram according to FIG. 9 of the present invention. [Figure 11] FIG. 13 is a diagram showing the rapid exhaust deceleration state of the main body in the present invention. [Figure 12] FIG. 12 is a control circuit diagram based on FIG. 11 of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Generally, the present invention can be understood more clearly by describing the details based on the most preferred and feasible embodiment of the present invention in combination with Figures 1 to 4. The present invention is a two-stage speed control device, which is made up of a main body 10, which is provided with a first port 15 and a second port 16 that communicate with each other, and a main passage 11 and a sub-passage 40 for circulating a fluid A, the sub-passage 41 unidirectionally circulating to a pressure accumulator 13, the main passage 11 circulating from the first port 15 and the second port 16 to the main body 10, and a slide shaft seat 14 is fitted into the second port 16.

[0016] The slide shaft unit 20 is mainly formed by drilling an elastic part 22 and a counter shaft part 23 in order at one end of a main shaft part 21, and then fitting one end of the main shaft part 21 to the inner wall of the main body 10. A balance passage 24 is formed between the main shaft part 21 and the counter shaft part 23, and an adjustment unit 30 is disposed at the other end of the main shaft part 21, and the adjustment unit 30 is formed by connecting a rotary knob connection part 31 and an adjustment rotary knob 32. One end of the slide shaft unit 20 forms a valve 50 together with the slide shaft base 14.

[0017] 5 to 8. The pressure accumulator 13 communicates with the main hole passage 12, and the secondary flow hole passage 231 is provided laterally in the secondary shaft part 23, and the fluid A flows through the first port 15. When the valve 50 is closed, the fluid A flows through the main passage 40, the balance passage 24, the secondary passage 41, the main hole passage 12, and the secondary flow hole passage 231, and flows to the outside from the second port 16. The slide shaft unit 20 starts to move upward due to the pressure of the internal fluid A of the pressure accumulator 13, and opens the valve 50. When the fluid A continues to pass through the valve 50 and circulates through the secondary flow hole passage 231, the valve 50 continues to be opened upward by the slide shaft unit 20, and thereby a cylinder connected to the main body 10 is driven to move forward at a two-stage speed of initial acceleration and high speed.

[0018] Further refer to Figs. 9 to 12. When the valve 50 rapidly exhausts from the intake state, the fluid A passes through all the above-mentioned passages and flows to the first port 15, thereby reducing the pressure of the internal fluid A in the pressure accumulator chamber 13. The slide shaft unit 20 gradually moves downward to close the valve 50, and further passes through the main flow hole passage 12 and the side flow hole passage 231, so that the valve 50 is adjusted to a completely closed state, thereby mitigating the impact of the reciprocating motion of the cylinder. At this time, the ratio of the area of ​​the valve 50 to the area of ​​the balance passage 24 is between 1:1 and 1:4, which mainly prevents the valve 50 from opening when the slide shaft unit 20 is pushed back.

[0019] When the main body 10 is in a rapid exhaust state, the above-mentioned adjusting unit 30 adjusts the elasticity of the elastic part 22 through the adjusting rotary knob 32 and the rotary knob connecting part 31, thereby restricting the position of the valve 50 at which the sliding shaft unit 20 closes, and thereby adjusting the internal buffer position of the cylinder connected to the main body 10.

[0020] A throttle 121 is further provided inside the above-mentioned mainstream hole passage 12, and the value obtained by subtracting the cross-sectional area of ​​the throttle 121 from the cross-sectional area of ​​the mainstream hole passage 12 is between 1% and 7% of the area of ​​the mainstream hole passage 12. The throttle 231 with a different cross-sectional area affects the pressure drop in the accumulator chamber 13, and also affects the buffer position of the cylinder when the valve 50 is closed by the slide shaft unit 20.

[0021] The diameter of the above mentioned side flow hole passage 231 is between 0.2 and 0.4 mm, and by using different diameters, the exhaust volume of the passage can slow down the exhaust action of the cylinder.

[0022] In summary, the two-stage speed control device of the present invention responds to the air pressure of the fluid A by the elastic force of the elastic part 22 of the slide shaft unit 20. Specifically, the elastic force is adjusted by the adjusting rotary knob 32 by intuitively operating and controlling the adjusting rotary knob 32, and further, the cylinder connected to the main body 10 has a two-stage speed buffering effect during operation according to the pressure of the fluid A in the control pressure accumulator 13 by providing the main flow hole passage 12 and the side flow hole passage 231, which affects the pressure drop of the pressure accumulator 13, and further adjustment can be made to adjust the buffering position and buffering speed of the cylinder connected to the main body 10, thereby better buffering the impact force received by the operation of the cylinder. [Explanation of symbols]

[0023] 10 Main unit 11 Main passage 12 Main hole passage 12 Throttle 13 Pressure accumulator 14 Slide axis base 15 First Port 16 Second Port 20 Slide axis unit 21 Spindle parts 22 Elastic parts 23 Countershaft parts 231 Side flow hole passage 24 Balanced Passage 30 Adjustment unit 31 Rotating knob connecting part 32 Adjustment rotary knob 40 Sub-aisle 50 Valve A fluid

Claims

1. A two-stage speed control device consisting of a main body and a slide shaft unit, the main body is provided with a first port and a second port which are in communication with each other, and a main passage and a sub-passage for circulating a fluid, the main passage circulates from the first port and the second port to the main body, the sub-passage circulates a fluid in one direction to the pressure accumulator chamber, and a slide shaft seat is fitted into the second port, The slide shaft unit is mainly formed by drilling an elastic part and a counter shaft part in order into one end of a main shaft part, and then fitting one end of the main shaft part to an inner wall of the main body. A balance passage is formed between the main shaft part and the counter shaft part. An adjustment unit is disposed on the other end of the main shaft part. The adjustment unit is formed by connecting a rotary knob connecting part and an adjustment rotary knob. One end of the slide shaft unit forms a valve together with the slide shaft base. The pressure accumulator communicates with the main hole passage. A side flow hole passage is provided laterally in the counter shaft part. The fluid flows from the first port. When the valve is closed, the fluid passes through the main passage, the balance passage, the side passage, the main hole passage, and the side flow hole passage. When the fluid continues to pass through the valve and circulates from the secondary flow hole passage, the valve continues to be opened upward by the slide shaft unit, thereby driving a cylinder connected to the main body to move forward at a two-stage speed of initial acceleration and high speed; when the fluid is rapidly exhausted with the valve open, the fluid passes through all the above-mentioned passages and flows to the first port, thereby gradually moving the slide shaft unit downward to close the valve; and further, the valve is adjusted and completely closed by the primary flow hole passage and the secondary flow hole passage, thereby mitigating the impact of the return operation of the cylinder.

2. 2. The two-stage speed control device according to claim 1, wherein the adjusting unit adjusts the elastic force of the elastic part through the adjusting rotary knob and the rotary knob connecting part when the main body is in a state of rapid exhaust, thereby restricting the position of the valve where the sliding shaft unit closes, thereby adjusting the buffer position inside the cylinder connected to the main body.

3. 2. The two-stage speed control device according to claim 1, characterized in that the mainstream hole passage is further provided with a throttle, the throttle is provided within the mainstream hole passage, and a cross-sectional area of ​​the mainstream hole passage minus a cross-sectional area of ​​the throttle is between 1% and 7% of the area of ​​the mainstream hole passage, so that the throttle with different cross-sectional areas affects the pressure drop in the accumulator chamber to close the valve, and further affects the buffer position of the cylinder.

4. 2. The two-stage speed control device as claimed in claim 1, wherein the ratio of the area of ​​the valve to the area of ​​the balance passage is between 1:1 and 1:4, thereby preventing the valve from opening when the slide shaft unit is pushed back.

5. The two-stage speed control device as claimed in claim 1, characterized in that the cross-sectional area of ​​the side flow hole passage is between 0.2 and 0.4 mm, and by using different cross-sectional areas, the exhaust action of the cylinder can be slowed down according to the exhaust volume of the passage.

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