A Cam Curve Generation Method Simulating Measured Conjugate Cam

Abstract

The present invention discloses a cam curve generation method for simulating a measured conjugate cam, comprising the following steps: step 1, a mounting position for a cam mechanism to be installed is reserved on a high-pressure constant-current pump; a test fixture comprises a first drive module and a second drive module, and the first drive module and the second drive module both comprise a motor, a position sensor and a motion conversion mechanism; step 2, setting the test fixture at the mounting position to replace the cam mechanism; step 3, determining the cam lift curve parameters of the conjugate cam according to the motion law of the output terminals of the two motion conversion mechanisms; step 4: obtaining a real-time flow curve diagram of the liquid flow of the high-pressure constant-current pump by measuring, comparing the cam lift curve with the real-time flow curve diagram, thereby adjusting the motion law of the output terminal of the motion conversion mechanism by modifying the motor control program, and optimizing the cam lift curve. The set cam lift curve can be tested without proofing the entity, reducing the proofing time and proofing cost.

Description

Technical Field

[0001] The invention relates to the field of high-pressure constant-current pump technology, and in particular to a cam curve generation method for simulating a measured conjugate cam. Background Art

[0002] Liquid chromatography instruments will use high-pressure constant-current pumps. High-pressure constant-current pumps use a two-stage series pump with a single power source. The main principle is to use a stepper motor in conjunction with a synchronous belt drive to drive the camshaft to rotate. A conjugate cam is fixed on the camshaft (two cams are on the same part to ensure the phase) to push two sliders respectively. The two sliders then push two plungers respectively to achieve the movement of the plungers according to the designed motion law. The movement of the plungers will change the pressure in the inlet and outlet liquid chambers. A one-way valve is used to realize the suction and discharge functions. The entire pump uses a conjugate cam to ensure the motion relationship, and the two plungers are connected in series to alternately feed to achieve stable and continuous liquid flow.

[0003] There are many factors that affect the stability of pump flow. In addition to the conjugate cam curve, which has the greatest impact, there are also factors such as the opening and closing action of the valve, spring response delay, etc., and the movement and timing relationship of the two cam curves of the conjugate cam are coupled with each other. Therefore, it is difficult to obtain two very ideal cam lift curves through forward theoretical design of this conjugate cam to obtain good liquid flow stability. The performance of the cam lift curve must be judged by measuring the performance of the cam on the pump. In order to gradually reduce the fluctuation amplitude of the overall liquid flow of the pump and the operating noise, it is necessary to perform an iterative cycle of "proofing and testing-fine-tuning optimization-proofing and testing again" to obtain a cam lift curve with better performance. If the cam is proofed each time and then tested and iterated, on the one hand, the cam proofing cycle is very long, and on the other hand, the cam proofing cost is high, which increases the project R&D cycle and cost.

[0004] Therefore, it is necessary to design a new technical solution to solve the above problems. Summary of the invention

[0005] In view of this, the present invention aims to address the deficiencies in the prior art, and its main purpose is to provide a cam curve generation method that simulates the measured conjugate cam. The method is provided with a motor and a motion conversion mechanism to simulate the movement of the conjugate cam and the slider, and in conjunction with a position sensor, the motion law of the output terminals of the two motion conversion mechanisms can be obtained. The cam lift curve parameters of the conjugate cam can be determined according to the motion law of the output terminals of the two motion conversion mechanisms. The real-time flow curve of the liquid flow of the high-pressure constant current pump is obtained by measurement, and the cam lift curve is compared with the real-time flow curve. The motion law of the output terminal of the motion conversion mechanism is adjusted by modifying the motor control program to optimize the cam lift curve. The cam lift curve is iteratively optimized by inferring the test results. The motor control program can be modified to simulate the operation effect of cams with different lift curves. The set cam lift curve can be tested without proofing the entity, which can reduce a lot of proofing time and proofing cost.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A cam curve generation method for simulating a measured conjugate cam comprises the following steps:

[0008] Step 1, prepare a high-pressure constant-current pump and a test fixture: the high-pressure constant-current pump includes two sliders and two plungers respectively pushed by the two sliders, and a mounting position for installing a cam mechanism is reserved on the high-pressure constant-current pump; the test fixture includes a first drive module and a second drive module, and the first drive module and the second drive module both include a motor, a position sensor and a motion conversion mechanism for converting rotational motion into linear motion, and the motor is connected to the motion conversion mechanism through a reduction mechanism;

[0009] Step 2, assembling the test fixture: placing the test fixture at the installation position to replace the cam mechanism, so that the output terminals of the two motion conversion mechanisms respectively abut against the two sliders;

[0010] Step 3, simulating the actual measurement process; the motor drives the corresponding motion conversion mechanism to perform linear reciprocating motion, thereby pushing the slider to perform linear reciprocating motion, so as to obtain the motion law of the output terminals of the two motion conversion mechanisms through the position sensor, and determine the cam lift curve parameters of the conjugate cam according to the motion law of the output terminals of the two motion conversion mechanisms;

[0011] Step 4: Optimize the cam lift curve; obtain the real-time flow curve of the liquid flow of the high-pressure constant current pump by measuring, compare the cam lift curve with the real-time flow curve, and adjust the motion law of the output terminal of the motion conversion mechanism by modifying the motor control program to optimize the cam lift curve.

[0012] As a preferred solution, it also includes step five, manufacturing of a conjugate cam: manufacturing the conjugate cam according to the two optimized cam lift curves.

[0013] As a preferred solution, it also includes step six, assembly of the high-pressure constant-current pump: first prepare a cam mechanism, the cam mechanism includes a synchronous belt transmission mechanism, a camshaft and a first stepper motor, the motor control program of the first stepper motor is set according to the program optimized in step four, and then the conjugate cam prepared in step five is fixed on the camshaft, and then the first stepper motor and the camshaft are installed side by side on the mounting position so that the camshaft is parallel to the rotating axis of the first stepper motor, and finally the rotating axis of the first stepper motor is connected to the camshaft through the synchronous belt transmission mechanism to complete the assembly of the high-pressure constant-current pump.

[0014] As a preferred solution, the motor is a second stepper motor, the position sensor is integrated into the second stepper motor to form an integrated closed-loop stepper motor, the speed reduction mechanism is a planetary speed reducer, the motion conversion mechanism includes a gear and a rack matching the gear, the gear is connected to the output end of the speed reduction mechanism, the gear is connected to the output end of the speed reduction mechanism, and the end of the rack close to the slider abuts against the slider;

[0015] Through the motor control program, a command preset can be input to the motor. When a cycle T=36s, the motor will feedback the motor stroke s every 0.1s during execution. In one cycle, 360 sets of feedback data can be obtained. Based on this feedback data, the motor stroke curve can be obtained. Each set of data can be calculated according to the transmission chain as follows to obtain the rack displacement h g :

[0016] Motor angular displacement formula:

[0017]

[0018] Planetary reducer angular displacement formula:

[0019]

[0020] Rack displacement formula:

[0021]

[0022] Cam lift formula:

[0023] h=h g +r0

[0024] Combining the above formulas, the relationship between the cam lift h and the motor stroke s is as follows:

[0025]

[0026] In the formula, the travel of the motor in one circle is S T , motor angular displacement θ s , planetary reducer angular displacement θ g , gear pitch circle diameter d g , rack displacement h g , planetary reducer reduction ratio i, cam base circle radius r0; the motor stroke curve can be converted into the cam lift curve, so as to determine the cam lift curve parameters of the conjugate cam.

[0027] As a preferred solution, the test tool also includes a mounting frame, which includes a base plate and two side plates arranged on both sides of the top of the base plate, the base plate is set on the mounting position, the two motors are respectively arranged on the two side plates, and the two motion conversion mechanisms are respectively arranged on the top of the base plate through two guide mechanisms and are located between the two side plates.

[0028] As a preferred solution, a reinforcing plate is fixed to the top of the two side plates.

[0029] As a preferred solution, the guiding mechanism includes a linear guide rail and a guide slider slidably arranged on the linear guide rail, and the motion conversion mechanism is fixed on the guide slider.

[0030] As a preferred solution, a mounting piece for fixing the motion conversion mechanism is provided on the guide sliding block, and the mounting piece is fixed to the top of the guide sliding block.

[0031] As a preferred embodiment, the high-pressure constant current pump includes a substrate and a frame arranged on the substrate, the frame is provided with a first mounting groove for movably installing a slider, the slider is slidably arranged in the first mounting groove, the frame is provided with a second mounting groove for installing a conjugate cam on the side of the first mounting groove away from the plunger, the mounting position is arranged on the side of the frame away from the plunger, the second mounting groove is provided with a avoidance opening connecting the second mounting groove and the mounting position, the motion conversion mechanism can movably penetrate the avoidance opening, the end of the frame away from the mounting position is provided with a flushing cavity, the flushing cavity has two liquid inlet and outlet cavities at the end away from the frame, and the two plungers can be movably arranged in the corresponding liquid inlet and outlet cavities after passing through the flushing cavity.

[0032] As a preferred solution, a mounting opening for mounting the slider is provided on a side of the second mounting groove, and a cover plate for covering the mounting opening is provided on the frame.

[0033] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical solution that:

[0034] Mainly, by providing a motor and a motion conversion mechanism, the movement of a conjugate cam and a slider can be simulated, and the motion law of the output terminals of the two motion conversion mechanisms can be obtained in conjunction with a position sensor. The cam lift curve parameters of the conjugate cam can be determined according to the motion law of the output terminals of the two motion conversion mechanisms. The real-time flow curve of the liquid flow of the high-pressure constant-current pump is obtained by measurement, and the cam lift curve is compared with the real-time flow curve. The motion law of the output terminal of the motion conversion mechanism is adjusted by modifying the motor control program to optimize the cam lift curve. The cam lift curve is iteratively optimized by inferring the test results. The motor control program can be modified to simulate the operation effect of cams with different lift curves. The set cam lift curve can be tested without proofing the entity, which can reduce a lot of proofing time and proofing costs.

[0035] In order to more clearly illustrate the structural features and effects of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the installation of the test tooling of the preferred embodiment of the present invention;

[0037] Figure 2 yes Figure 1 Schematic diagram of the decomposition of

[0038] Figure 3 yes Figure 1 A cross-sectional schematic diagram of

[0039] Figure 4 It is a cross-sectional schematic diagram of a high-pressure constant-current pump according to a preferred embodiment of the present invention;

[0040] Figure 5 It is a motor stroke curve diagram of a preferred embodiment of the present invention;

[0041] Figure 6 It is a cam lift curve diagram of a preferred embodiment of the present invention.

[0042] Description of the accompanying drawings:

[0043] 10. High-pressure constant-current pump 11. Slider

[0044] 12. Plunger 13. Base plate

[0045] 14. Frame 141. First mounting slot

[0046] 142. Second installation slot 143. Avoidance opening

[0047] 144, installation port 15, flushing cavity

[0048] 16. Liquid inlet and outlet cavity 17. Cover plate

[0049] 101, installation position 20, test tooling

[0050] 21. First driving module 22. Second driving module

[0051] 23. Mounting frame 231. Bottom plate

[0052] 232, side plate 233, reinforcement plate

[0053] 24. Guide mechanism 241. Linear guide

[0054] 242, guide slide 243, mounting piece

[0055] 201. Motor

[0056] 203, motion conversion mechanism 2031, gear

[0057] 2032, rack 204, speed reduction mechanism

[0058] 30. Cam mechanism 31. Synchronous belt transmission mechanism

[0059] 32. Camshaft 33. First stepper motor

[0060] 40. Conjugate cam. DETAILED DESCRIPTION

[0061] First of all, it should be noted that in the description of the present invention, the terms "up", "down", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0062] Please refer to Figures 1 to 6 As shown, it shows the specific structure of a preferred embodiment of the present invention, including the following steps:

[0063] Step 1, prepare a high-pressure constant-current pump 10 and a test fixture 20: the high-pressure constant-current pump 10 includes two sliders 11, two plungers 12 respectively pushed by the two sliders 11, and a mounting position 101 for installing a cam mechanism 30 is reserved on the high-pressure constant-current pump 10; the test fixture 20 includes a first drive module 21 and a second drive module 22, the first drive module 21 and the second drive module 22 both include a motor 201, a position sensor (not shown in the figure) and a motion conversion mechanism 203 for converting rotational motion into linear motion, and the motor 201 is connected to the motion conversion mechanism 203 through a reduction mechanism 204;

[0064] Step 2, assembling the test fixture 20: placing the test fixture 20 at the installation position 101 to replace the cam mechanism 30, so that the output terminals of the two motion conversion mechanisms 203 respectively abut against the two sliders 11;

[0065] Step 3, simulating the actual measurement process; the motor 201 drives the corresponding motion conversion mechanism 203 to perform linear reciprocating motion, thereby pushing the slider 11 to perform linear reciprocating motion, so as to obtain the motion law of the output terminals of the two motion conversion mechanisms 203 through the position sensor, and determine the cam lift curve parameters of the conjugate cam according to the motion law of the output terminals of the two motion conversion mechanisms 203;

[0066] Step 4: Optimize the cam lift curve; obtain the real-time flow curve of the liquid flow of the high-pressure constant flow pump 10 by measuring, and the flow rate and velocity measuring equipment can be used for measurement to obtain parameters such as flow rate, flow velocity, and cumulative flow rate to obtain the real-time flow curve, and compare the cam lift curve with the real-time flow curve (it can be concluded that the flow fluctuation of which nodes in the cycle is larger, or the flow fluctuation and the reciprocating motion law of the slider 11 are related to each other as a whole), so as to adjust the motion law of the output terminal of the motion conversion mechanism 203 by modifying the motor control program to optimize the cam lift curve;

[0067] Step 5, manufacturing the conjugate cam 40: manufacturing the conjugate cam according to the two optimized cam lift curves;

[0068] Step six, assembly of the high-pressure constant-current pump 10: first prepare the cam mechanism 30, the cam mechanism 30 includes a synchronous belt transmission mechanism 31, a camshaft 32 and a first stepper motor 33, the motor control program of the first stepper motor 33 is set according to the program optimized in step four, and then the conjugate cam 40 prepared in step five is fixed on the camshaft 32, and then the first stepper motor 33 and the camshaft 32 are installed side by side on the mounting position 101, so that the camshaft 32 is parallel to the rotating axis of the first stepper motor 33, and finally the rotating axis of the first stepper motor 33 is connected to the camshaft 32 through the synchronous belt transmission mechanism 31 to complete the assembly of the high-pressure constant-current pump 10.

[0069] See also Figure 1As shown, the motor 201 is a second stepper motor, the position sensor is integrated into the second stepper motor to form an integrated closed-loop stepper motor, the speed reduction mechanism 204 is a planetary speed reducer, and the speed reduction mechanism 204 can also be a speed reduction gear transmission, belt transmission, chain transmission, etc. The motion conversion mechanism 203 includes a gear 2031 and a rack 2032 matched with the gear 2031, the gear 2031 is connected to the output end of the speed reduction mechanism 204, the gear 2031 is connected to the output end of the speed reduction mechanism 204, the end of the rack 2032 close to the slider 11 is against the slider 11, and the motion conversion mechanism 203 can also be a worm gear mechanism, a screw nut mechanism, etc.;

[0070] Through the motor control program, a command preset can be input to the motor 201. For the convenience of conversion, a cycle T = 36s is taken. When the motor 201 is executed, the motor stroke s is fed back every 0.1s. In one cycle, 360 sets of feedback data can be obtained. Based on this feedback data, the motor stroke curve can be obtained (see Figure 5 As shown), each set of data can be calculated according to the transmission chain to obtain the rack displacement h g :

[0071] Motor angular displacement formula:

[0072]

[0073] Planetary reducer angular displacement formula:

[0074]

[0075] Rack displacement formula:

[0076]

[0077] Cam lift formula:

[0078] h=h g +r0

[0079] Combining the above formulas, the relationship between the cam lift h and the motor stroke s is as follows:

[0080]

[0081] In the formula, the travel of the motor in one circle is S T , motor angular displacement θ s , planetary reducer angular displacement θ g , gear pitch circle diameter d g , rack displacement h g, planetary reducer reduction ratio i, cam base circle radius r0; at the same time, when the cam rotates at a constant speed, then within the same period T, every 0.1s corresponds to a cam rotation angle of 1°, then the motor stroke curve can be converted into a cam lift curve (see Figure 6 As shown), the cam lift curve parameters of the conjugate cam can be determined.

[0082] See also Figure 2 As shown, the test fixture 20 also includes a mounting frame 23, which includes a base plate 231 and two side plates 232 arranged on both sides of the top of the base plate 231, the base plate 231 is arranged on the mounting position 101, the two motors 201 are respectively arranged on the two side plates 232, the two motion conversion mechanisms 203 are respectively arranged on the top of the base plate 231 through two guide mechanisms 24, and are located between the two side plates 232, and the tops of the two side plates 232 are fixed with a reinforcing plate 233; specifically, the guide mechanism 24 includes a linear guide rail 241 and a guide slider 242 slidably arranged on the linear guide rail 241, the guide slider 242 is provided with a mounting member 243 for fixing the motion conversion mechanism 203, the mounting member 243 is fixed to the top of the guide slider 242, and the guide mechanism 24 can also be a linear guide rod, a guide groove guide block structure, etc.

[0083] See also Figure 2 and Figure 3 As shown, the high-pressure constant-current pump 10 includes a substrate 13 and a frame 14 arranged on the substrate 13, the frame 14 is provided with a first mounting groove 141 for movable installation of the slider 11, the slider 11 is slidably arranged in the first mounting groove 141, the frame 14 is provided with a second mounting groove 142 for installation of a conjugate cam on the side of the first mounting groove 141 away from the plunger 12, the mounting position 101 is arranged on the side of the frame 14 away from the plunger 12, the second mounting groove 142 is provided with an escape port 143 connecting the second mounting groove 142 and the mounting position 101, the motion conversion mechanism 203 can movably penetrate the escape port 143, the frame 14 is provided with a flushing cavity 15 at one end away from the mounting position 101, the flushing cavity 15 is provided with two inlet and outlet liquid cavities 16 at one end away from the frame 14, and the two plungers 12 can be movably arranged in the corresponding inlet and outlet liquid cavities 16 after passing through the flushing cavity 15;

[0084] Specifically, a mounting opening 144 for mounting the slider 11 is formed on a side of the second mounting groove 142 , and a cover plate 17 for covering the mounting opening 144 is disposed on the frame 14 .

[0085] The design emphasis of the present invention is:

[0086] Mainly, by providing a motor and a motion conversion mechanism, the movement of a conjugate cam and a slider can be simulated, and the motion law of the output terminals of the two motion conversion mechanisms can be obtained in conjunction with a position sensor. The cam lift curve parameters of the conjugate cam can be determined according to the motion law of the output terminals of the two motion conversion mechanisms. The real-time flow curve of the liquid flow of the high-pressure constant-current pump is obtained by measurement, and the cam lift curve is compared with the real-time flow curve. The motion law of the output terminal of the motion conversion mechanism is adjusted by modifying the motor control program to optimize the cam lift curve. The cam lift curve is iteratively optimized by inferring the test results. The motor control program can be modified to simulate the operation effect of cams with different lift curves. The set cam lift curve can be tested without proofing the entity, which can reduce a lot of proofing time and proofing costs.

[0087] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A cam curve generation method for simulating a measured conjugate cam, characterized in that: The steps include: Step 1, prepare a high-pressure constant-current pump and a test fixture: the high-pressure constant-current pump includes two sliders and two plungers respectively pushed by the two sliders, and a mounting position for installing a cam mechanism is reserved on the high-pressure constant-current pump; the test fixture includes a first drive module and a second drive module, and the first drive module and the second drive module both include a motor, a position sensor and a motion conversion mechanism for converting rotational motion into linear motion, and the motor is connected to the motion conversion mechanism through a reduction mechanism; Step 2, assembling the test fixture: placing the test fixture at the installation position to replace the cam mechanism, so that the output terminals of the two motion conversion mechanisms respectively abut against the two sliders; Step 3, simulating the actual measurement process; the motor drives the corresponding motion conversion mechanism to perform linear reciprocating motion, thereby pushing the slider to perform linear reciprocating motion, so as to obtain the motion law of the output terminals of the two motion conversion mechanisms through the position sensor, and determine the cam lift curve parameters of the conjugate cam according to the motion law of the output terminals of the two motion conversion mechanisms; Step 4: Optimize the cam lift curve; obtain the real-time flow curve of the liquid flow of the high-pressure constant-current pump by measuring, compare the cam lift curve with the real-time flow curve, and adjust the motion law of the output terminal of the motion conversion mechanism by modifying the motor control program to optimize the cam lift curve; Wherein, the motor is a second stepper motor, the position sensor is integrated into the second stepper motor to form an integrated closed-loop stepper motor, the speed reduction mechanism is a planetary speed reducer, the motion conversion mechanism includes a gear and a rack matching the gear, the gear is connected to the output end of the speed reduction mechanism, the gear is connected to the output end of the speed reduction mechanism, and the end of the rack close to the slider abuts against the slider; Through the motor control program, a command preset can be input to the motor. When a cycle T=36s, the motor will feedback the motor stroke s every 0.1s during execution. In one cycle, 360 sets of feedback data can be obtained. Based on this feedback data, the motor stroke curve can be obtained. Each set of data can be calculated according to the transmission chain as follows to obtain the rack displacement : Motor angular displacement formula: Planetary reducer angular displacement formula: Rack displacement formula: Cam lift formula: Combining the above formulas, the relationship between the cam lift h and the motor stroke s is as follows: In the formula, the travel of the motor in one circle is , motor angular displacement , planetary reducer angular displacement , gear pitch circle diameter , rack displacement , planetary reducer reduction ratio , cam base circle radius ; The motor stroke curve can be converted into a cam lift curve, so that the cam lift curve parameters of the conjugate cam can be determined.

2. The method for generating a cam curve simulating a measured conjugate cam according to claim 1, characterized in that: The method also includes step five, manufacturing a conjugate cam: manufacturing the conjugate cam according to two optimized cam lift curves.

3. The method for generating a cam curve simulating a measured conjugate cam according to claim 2, characterized in that: It also includes step six, assembly of the high-pressure constant-current pump: first prepare a cam mechanism, the cam mechanism includes a synchronous belt transmission mechanism, a camshaft and a first stepper motor, the motor control program of the first stepper motor is set according to the program optimized in step four, and then the conjugate cam made in step five is fixed on the camshaft, and then the first stepper motor and the camshaft are installed side by side on the mounting position so that the camshaft is parallel to the rotating axis of the first stepper motor, and finally the rotating axis of the first stepper motor is connected to the camshaft through the synchronous belt transmission mechanism to complete the assembly of the high-pressure constant-current pump.

4. The method for generating a cam curve simulating a measured conjugate cam according to claim 1, characterized in that: The test fixture also includes a mounting frame, which includes a base plate and two side plates arranged on both sides of the top of the base plate. The base plate is set on the mounting position, the two motors are respectively arranged on the two side plates, and the two motion conversion mechanisms are respectively arranged on the top of the base plate through two guide mechanisms and are located between the two side plates.

5. The method for generating a cam curve simulating a measured conjugate cam according to claim 4, characterized in that: A reinforcing plate is fixed to the tops of the two side plates.

6. The method for generating a cam curve simulating a measured conjugate cam according to claim 4, characterized in that: The guiding mechanism comprises a linear guide rail and a guide slider slidably arranged on the linear guide rail, and the motion conversion mechanism is fixed on the guide slider.

7. The method for generating a cam curve simulating a measured conjugate cam according to claim 6, characterized in that: The guide sliding block is provided with a mounting piece for fixing the motion conversion mechanism, and the mounting piece is fixed to the top of the guide sliding block.

8. The method for generating a cam curve simulating a measured conjugate cam according to claim 1, characterized in that: The high-pressure constant-current pump includes a substrate and a frame arranged on the substrate, the frame is provided with a first mounting groove for movably installing a slider, the slider is slidably arranged in the first mounting groove, the frame is provided with a second mounting groove for installing a conjugate cam on the side of the first mounting groove away from the plunger, the mounting position is arranged on the side of the end of the frame away from the plunger, the second mounting groove is provided with an escape port connecting the second mounting groove and the mounting position, the motion conversion mechanism can movably penetrate the escape port, the end of the frame away from the mounting position is provided with a flushing cavity, the flushing cavity has two liquid inlet and outlet cavities at the end away from the frame, and the two plungers can be movably arranged in the corresponding liquid inlet and outlet cavities after passing through the flushing cavity.

9. The method for generating a cam curve simulating a measured conjugate cam according to claim 8, characterized in that: A mounting opening for mounting the slider is provided on the side of the second mounting groove, and a cover plate for covering the mounting opening is provided on the frame.

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