Needleless injection device with adjustable injection pressure

Abstract

The utility model discloses a needleless injection device with adjustable injection pressure, and relates to the technical field of livestock breeding equipment, in particular to the needleless injection device with the adjustable injection pressure, the needleless injection device with the adjustable injection pressure comprises an injection assembly and a needle assembly, the injection assembly comprises an injection cavity main body and a push rod piston, an injection cavity is formed in the injection cavity main body, and the push rod piston is installed in the injection cavity in a sealed and sliding mode; the driving assembly comprises a push rod and a power spring, the push rod is fixedly connected with the push rod piston, and the power spring is connected with the push rod and used for driving the push rod to act in the release process after compression; the pressure regulating assembly is connected with the power spring; according to the needle-free injection device with the adjustable injection pressure, the pressure adjusting assembly is additionally arranged, the initial compression amount of the power spring in the driving assembly is changed, then the maximum elastic force of the power spring during force storage is changed, the injection pressure during injection is changed, and therefore the injection pressure can be adjusted so as to adapt to injection of swinery of different day ages.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of livestock breeding equipment more specifically, relate to a kind of injection pressure adjustable needleless injection device. BACKGROUND

[0002] Injection therapy is crucial in the breeding industry, which can reduce the death loss of pig population caused by disease. Needle-free injection technology can solve the risk of broken needle and cross-infection between different animals, mutual transmission of diseases when needle injection;

[0003] But different age groups of pig skin thickness is different, when adopting needle-free injection immunization needs different injection pressure, to ensure that the drug can be injected into the pig skin, so that the pig population produces antibodies faster, when injection pressure is too small, for large age pig, its skin layer is thicker, injection liquid jet cannot pass through pig surface skin, a large amount of liquid remains in the skin surface, cannot play the due therapeutic effect;But if injection pressure is too large, for small age pig, its skin layer is thin, main liquid jet breaks through skin layer, still has large kinetic energy, continues to break through other subcutaneous tissue, can cause pig meat damage, and cannot be absorbed by capillary in subcutaneous tissue quickly;Therefore, when pig injection is carried out, the needleless injector with appropriate injection pressure needs to be selected according to the age of pig, and the injector needs to be frequently replaced during injection, which causes the injection efficiency to decrease.

[0004] In summary, how to solve the problem of different injection pressure injectors required for different skin thickness of pig population during injection is a problem to be solved by the technical personnel in the field at present. INVENTION CONTENTS

[0005] Therefore, the utility model aims at providing a kind of needleless injection device of injection pressure adjustable, by increasing pressure regulating component, the initial compression of power spring in driving assembly is changed, and then the maximum elastic force of power spring is changed when force is accumulated, and then the injection pressure during injection is changed, so as to realize injection pressure adjustable, to adapt to the injection use of different age pig population.

[0006] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0007] A kind of needleless injection device of injection pressure adjustable, comprising:

[0008] Injection assembly, including injection cavity main body and push rod piston, injection cavity is equipped in the injection cavity main body, the push rod piston is sealed and slidably installed in the injection cavity;

[0009] Driving assembly, including push rod and power spring, the push rod is fixedly connected with the push rod piston, the power spring is connected with the push rod, for driving the push rod action in the release process after compression.

[0010] The pressure regulating assembly is connected with the power spring, and is used for adjusting the position of the fixed end of the power spring to change the initial compression deformation amount of the power spring.

[0011] Preferably, the pressure regulating assembly comprises an adjusting push block and a limiting adjusting sleeve, and the adjusting push block is coaxially and threadedly installed with the limiting adjusting sleeve.

[0012] The adjusting push block abuts against the fixed end of the power spring.

[0013] The limiting adjusting sleeve is fixedly connected with the injection cavity main body.

[0014] Preferably, the adjusting push block is sleeved in the limiting adjusting sleeve, and a first stop ring is arranged on the outer periphery of the adjusting push block, and a limiting sleeve limiting the maximum displacement of the first stop ring is arranged on the end of the limiting adjusting sleeve.

[0015] The limiting sleeve is sleeved in the limiting adjusting sleeve, and an annular groove is arranged on the outer periphery of the limiting sleeve, and a threaded hole penetrating through the corresponding position of the annular groove and the sleeve wall of the limiting adjusting sleeve is arranged, and a ball plunger with the end clamped in the annular groove is arranged in the threaded hole.

[0016] Preferably, a pressure sensor is arranged between the adjusting push block and the fixed end of the power spring, and is used for monitoring the elastic force of the power spring.

[0017] Preferably, an adjusting rod is coaxially arranged in the adjusting push block through a spline structure, an end face gear is fixedly arranged in the adjusting rod, and the end face gear and the end of the limiting adjusting sleeve are provided with axially intermeshing gear teeth.

[0018] Preferably, the driving assembly further comprises a cam pin and a planar cam, the cam pin is vertically connected with the push rod, the helical circumferential surface of the planar cam abuts against the circumferential surface of the cam pin, the axis of the planar cam is provided with a motor, and the rotary axis of the planar cam is perpendicular to the axis of the push rod.

[0019] Preferably, the pressure regulating assembly further comprises a sleeve, and the two ends of the sleeve abut against the fixed end of the power spring and the adjusting push block respectively.

[0020] The push rod is coaxially sleeved in the power spring, and the free end of the push rod is inserted into the sleeve, and the free end of the push rod is provided with a rear fixing block for fixing the cam pin.

[0021] Preferably, the injection assembly further comprises a trigger switch and a trigger spring, the trigger switch is sleeved outside the nozzle at the medicine outlet end of the injection cavity body, two ends of the trigger spring are connected with the trigger switch and the injection cavity body, and the trigger switch is electrically connected with the control unit of the driving assembly.

[0022] Preferably, the trigger switch is gap-fitted with the nozzle, a magnetic assembly is arranged at the rear end of the trigger switch, and a Hall switch is arranged at the front end of the injection cavity body, and the Hall switch is electrically connected with the control unit of the driving assembly.

[0023] The Hall switch comprises a substrate arranged perpendicularly to the center line of the nozzle and a plurality of groups of detection Hall elements arranged in a ring array on the surface of the substrate, the detection Hall elements are turned on when the magnetic assembly is close to the detection Hall elements, and the Hall switch is turned on when the detection Hall elements at opposite angles are turned on.

[0024] Compared with the prior art, the needle-free injection device with adjustable injection pressure provided by the utility model has at least the following beneficial effects:

[0025] By arranging the adjusting assembly, the fixed end of the power spring is adjusted in position to change the relative distance between the power spring and the injection cavity body, and then the initial compression deformation of the power spring is changed, when the power spring works to store force, the maximum elastic force is adjusted synchronously, and then the acceleration of the piston push rod during work is changed, and then the injection pressure is adjusted. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only the embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative labor.

[0027] Figure 1 The structure diagram of the specific needle-free injection device with adjustable injection pressure provided by the utility model is shown in the figure.

[0028] Figure 2 The internal structure diagram of the specific needle-free injection device with adjustable injection pressure provided by the utility model is shown in the figure.

[0029] Figure 3 The internal structure diagram of the specific needle-free injection device with adjustable injection pressure provided by the utility model is shown in the figure.

[0030] Figure 4 The specific needle-free injection device with adjustable injection pressure provided by the utility model is shown in the figure. Figure 3 The enlarged view of A in the figure.

[0031] Figure 5 The utility model provides Figure 3 The enlarged view of B;

[0032] Figure 6 The utility model provides Figure 3 The enlarged view of C;

[0033] Figure 7 The utility model provides the structure diagram of specific hall switch.

[0034] In the figure:

[0035] 1, injection assembly;101, trigger switch;102, trigger spring;103, injection cavity main body;104, medicine inlet cavity main body;105, medicine extraction block;106, check valve;107, nozzle;108, hall switch;109, push rod piston;

[0036] 2, drive assembly;201, plane cam;202, push rod;203, power spring;204, connecting nut;205, front guide sleeve;206, rear guide sleeve;207, rear fixed block;208, cam pin;209, motor;

[0037] 3, pressure regulating assembly;301, hand wheel;302, pressure sensor;303, limit adjusting sleeve;304, adjusting push block;305, adjusting rod;306, end face gear;307, limit sleeve;308, ball head plunger;309, first check ring;310, second check ring;311, sleeve;

[0038] 4, display screen. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the utility model.

[0040] The core of the utility model is to provide a kind of injection pressure adjustable needleless injection device, by increasing pressure regulating assembly, the initial compression of power spring in drive assembly is changed, and then the maximum elastic force when power spring accumulates force is changed, and then the injection pressure when injecting is changed, so that injection pressure is adjustable, to adapt to the injection use of different day-old pig group.

[0041] Please refer to Figures 1-7 A kind of injection pressure adjustable needleless injection device, comprising:

[0042] The injection assembly 1 comprises an injection cavity body 103 and a push rod piston 109, the injection cavity body 103 is provided with an injection cavity, and the push rod piston 109 is sealingly and slidingly installed in the injection cavity;

[0043] The driving assembly 2 comprises a push rod 202 and a power spring 203, the push rod 202 is fixedly connected with the push rod piston 109, and the power spring 203 is connected with the push rod 202 and used for driving the push rod 202 to act in a release process after compression;

[0044] The pressure regulating assembly 3 is connected with the power spring 203 and used for adjusting the position of the fixed end of the power spring 203 to change the initial compression deformation amount of the power spring 203.

[0045] In actual use, the position of the fixed end of the power spring 203 is changed by setting the pressure regulating assembly 3, for example, the distance between the power spring 203 and the injection cavity is reduced, that is, the deformation amount of the power spring 203 is increased in the initial state, when the push rod 202 drives the free end of the power spring 203 to act the same movement amount, that is, the power spring 203 again deforms by an equal length, but the overall deformation amount of the power spring 203 is increased, at this time, the elastic force is increased compared with the elastic force when the position of the fixed end of the power spring 203 is not adjusted, and the elastic potential energy stored in the inside is increased, when the power spring 203 is released, the push rod 202 and the push rod piston 109 can obtain greater acceleration, so that the liquid medicine in the injection cavity can be shot out with greater pressure or greater initial speed to penetrate the skin surface layer of the pig;

[0046] When the fixed end of the power spring 203 is away from the injection cavity, the effect is opposite, therefore, by adjusting the position of the fixed end of the power spring 203 through the pressure regulating assembly 3, the injection pressure and the initial injection speed of the liquid medicine in the injection cavity can be changed to meet the injection of pigs of different ages and different surface layer thicknesses, that is, one needle-free injection device can be used to complete the injection of a pig group, and the injection device does not need to be replaced in the process.

[0047] In some embodiments, as shown in Figure 6 The pressure regulating assembly 3 comprises an adjusting push block 304 and a limiting adjustment sleeve 303, the adjusting push block 304 and the limiting adjustment sleeve 303 are coaxially and threadedly installed;

[0048] The adjusting push block 304 abuts against the fixed end of the power spring 203;

[0049] The limiting adjustment sleeve 303 is fixedly connected with the injection cavity body 103;

[0050] The fixed end position of the power spring 203 is adjusted by the threaded adjusting push block 304 and the limiting adjusting sleeve 303, wherein the limiting adjusting sleeve 303 is fixedly connected with the injection cavity body 103 through the shell of the driving assembly 2, and the adjusting push block 304 is rotated to adjust the relative position relationship between the adjusting push block 304 and the limiting adjusting sleeve 303, thereby pushing the relative position relationship between the fixed end of the power spring 203 and the injection cavity, and the threaded connection between the adjusting push block 304 and the limiting adjusting sleeve 303 has good self-locking performance, so as to ensure the stability of the relative position relationship between the two during use.

[0051] In some embodiments, as shown in Figure 6 The adjusting push block 304 is sleeved in the inside of the limiting adjusting sleeve 303, and the outer periphery of the adjusting push block 304 is provided with a first stop ring 309, and the end of the limiting adjusting sleeve 303 is provided with a limiting sleeve 307 for limiting the maximum displacement of the first stop ring 309;

[0052] The limiting sleeve 307 is sleeved in the inside of the limiting adjusting sleeve 303, and the outer periphery is provided with an annular groove, and the corresponding position of the sleeve wall of the limiting adjusting sleeve 303 and the annular groove is provided with a threaded hole penetrating through, and the threaded hole is provided with a ball plunger 308 with the end clamped in the annular groove;

[0053] By setting the first stop ring 309 outside the adjusting push block 304 and the limiting sleeve 307 inside the limiting adjusting sleeve 303, when the first stop ring 309 passes through the position of the limiting sleeve 307, the end faces of the two abut against each other, thereby playing a limiting role, so as to limit the maximum displacement of the adjusting push block 304 in the limiting adjusting sleeve 303, and avoid the two from being separated.

[0054] In some embodiments, as shown in Figure 6 A pressure sensor 302 is arranged between the adjusting push block 304 and the fixed end of the power spring 203, for monitoring the elastic force of the power spring 203;

[0055] As shown in Figure 1 A display screen 4 is arranged on the shell of the device, for displaying the detection value of the pressure sensor 302, i.e. the elastic force of the power spring 203, so as to calculate the current corresponding drug injection pressure according to the elastic force of the power spring 203 under the force storage state, calculate the pig skin layer thickness that can be penetrated, and the pig age suitable for use, and display the above results through the display screen 4.

[0056] In some embodiments, as shown in Figure 1 and Figure 6As shown, the adjusting push block 304 is coaxially provided with an adjusting rod 305 through a spline structure, the adjusting rod 305 is fixedly provided with an end face gear 306, and the end face gear 306 and the end portion of the limiting adjusting sleeve 303 are provided with axially meshing gear teeth;

[0057] The end portion of the adjusting rod 305 is provided with a hand wheel 301, the hand wheel 301 is rotated to drive the adjusting rod 305 to rotate, and then drive the adjusting push block 304 to rotate, through the screw connection between the adjusting push block 304 and the limiting adjusting sleeve 303, the adjusting push block 304 and the limiting adjusting sleeve 303 are axially moved, and then the fixed end position adjustment of the power spring 203 is realized;

[0058] The adjusting rod 305 and the adjusting push block 304 are connected through the spline structure, so that when the two are coaxially rotated, the axial relative movement of the two can occur, and in order to avoid the movement of the adjusting push block 304 caused by the accidental touch of the hand wheel 301 during injection, the end face gear 306 is fixedly arranged in the adjusting rod 305, when the end face gear 306 meshes with the end portion of the limiting adjusting sleeve 303, the adjusting rod 305 cannot rotate, that is, accidental touch cannot occur, when adjustment is needed, part of the adjusting rod 305 is pulled out backward, so that the end face gear 306 meshes with the end portion of the limiting adjusting sleeve 303 and is separated, and then the rotation of the adjusting rod 305 can be realized;

[0059] In some embodiments, the adjusting rod 305 is a hexagonal prism structure, and the adjusting push block 304 is a matching hexagonal prism through hole, the two are inserted into each other to realize the function of the spline structure; at the same time, the adjusting rod 305 is a stepped shaft, the end face gear 306 is clamped at the stepped surface of the adjusting rod 305, the rear is fixed through the second stop ring 310, so that the end face gear 306 can rotate coaxially with the adjusting rod 305, and axial relative displacement cannot occur;

[0060] However, in some embodiments, the hand wheel 301 and the end face gear 306 are removed, and an adjusting motor is used to directly drive the adjusting rod 305, which also belongs to the protection range of the application.

[0061] In some embodiments, as shown, Figure 5 The driving assembly 2 further includes a cam pin 208 and a planar cam 201, the cam pin 208 is vertically connected with the push rod 202, the helical circumferential surface of the planar cam 201 abuts against the circumferential surface of the cam pin 208, the axis of the planar cam 201 is provided with a motor 209, and the rotation axis of the planar cam 201 is perpendicular to the axis of the push rod 202;

[0062] The planar cam 201 is driven by the motor 209, the push rod 202 is driven by the planar cam 201 to move axially, and then the power spring 203 is compressed and released, so that the injection of the liquid medicine in the injection cavity is realized;

[0063] By making the axis of the planar cam 201 perpendicular to the axis of the push rod 202, the overall device can be designed in the shape of a pistol, a more ergonomic design, convenient to hold.

[0064] In some embodiments, as shown in Figure 3 and Figure 5 The pressure regulating assembly 3 also includes a sleeve 311, the two ends of the sleeve 311 abut the fixed end of the power spring 203 and the adjustment push block 304 respectively;

[0065] The push rod 202 is coaxially sleeved inside the power spring 203, and the free end is inserted into the sleeve 311, and the free end of the push rod 202 is provided with a rear fixing block 207 for fixing the cam pin 208;

[0066] The structure design of the power spring 203 sleeved on the push rod 202 facilitates to ensure that the elastic force of the power spring 203 is consistent with the axial direction of the push rod 202, thereby ensuring the flexibility of the movement of the push rod piston 109 in the injection cavity;

[0067] Meanwhile, the sleeve 311 is provided, and a long slot is provided on the wall of the sleeve 311, the cam pin 208 penetrates through the long slot and can move in the long slot, thereby facilitating the arrangement of the motor 209 and the planar cam 201;

[0068] The shell of the drive assembly 2 is a cylindrical structure, the front guide sleeve 205 and the rear guide sleeve 206 are respectively arranged at the front end and the rear end of the push rod 202, the front guide sleeve 205 is fixed with the push rod 202, and the rear guide sleeve 206 is fixed with the shell, so that the push rod 202 has good straightness when moving, and the front end of the push rod 202 is connected with the push rod piston 109 through the connecting nut 204, specifically, the push rod piston 109 is sleeved in the connecting nut 204, and the two are gap fit, and the push rod 202 is connected with the connecting nut 204 through threads, so that when the straightness of the movement of the push rod 202 is not high, the movement of the push rod piston 109 in the injection cavity is not affected.

[0069] In some embodiments, as shown in Figure 2 and Figure 4 The injection assembly 1 also includes a trigger switch 101 and a trigger spring 102, the trigger switch 101 is sleeved outside the nozzle 107 at the drug outlet end of the injection cavity body 103, the two ends of the trigger spring 102 are connected with the trigger switch 101 and the injection cavity body 103, and the trigger switch 101 is electrically connected with the control unit of the drive assembly 2;

[0070] The trigger switch 101 is arranged at the front end of the nozzle 107, when the trigger switch 101 contacts the skin of the pig and moves backward, the trigger switch 101 is triggered, the motor 209 is controlled to act, and the drive assembly 2 is driven to execute the driving process, completing a injection cycle;

[0071] In actual design, the injection assembly 1 further comprises a medicine inlet cavity body 104 fixedly connected with the injection cavity body 103, and an internal cavity communicated with the injection cavity is arranged in the medicine inlet cavity body 104, and a medicine extraction block 105 is fixedly arranged in the internal cavity of the medicine inlet cavity body 104, the medicine extraction block 105 is a hollow cylindrical structure, a push rod piston 109 is slidingly and sealingly penetrated through the hollow part of the medicine extraction block 105, and an annular groove is arranged on the outer periphery of the medicine extraction block 105, the annular groove is communicated with the medicine inlet of the medicine inlet cavity body 104, a channel is arranged in the medicine extraction block 105 in a radial direction and communicated with the annular groove and the internal hollow part of the medicine extraction block 105, and a one-way valve 106 is further arranged between the injection cavity and the nozzle 107;

[0072] When the driving assembly 2 drives the push rod 202 to move backward, the push rod piston 109 is driven to move backward, and a negative pressure is formed in the injection cavity and the hollow part of the medicine extraction block 105, so that the medicine liquid flows into the annular groove of the medicine extraction block 105 through the medicine inlet of the medicine inlet cavity body 104, and then enters the injection cavity and the hollow part of the medicine extraction block 105 through the radial channel, and the extraction of the medicine liquid is completed.

[0073] When the planar cam 201 continues to rotate to the position where the radius suddenly changes, the push rod 202 is quickly moved forward under the action of the power spring 203, the push rod piston 109 is quickly moved, the pressure in the injection cavity is quickly increased, when the pressure exceeds the conduction pressure of the one-way valve 106, the one-way valve 106 is conducted, the medicine liquid is quickly ejected through the nozzle 107, and the injection is completed.

[0074] In some embodiments, as Figure 4 and Figure 7 The trigger switch 101 is gap-fitted with the nozzle 107, a magnetic assembly is arranged at the rear end of the trigger switch 101, and a Hall switch 108 is arranged at the front end of the injection cavity body 103, and the Hall switch 108 is electrically connected with the control unit of the driving assembly 2.

[0075] The Hall switch 108 comprises a substrate arranged perpendicularly to the center line of the nozzle 107 and a plurality of groups of detection Hall elements arranged in an annular array on the surface of the substrate, when the magnetic assembly approaches the detection Hall elements, the detection Hall elements are conducted, and when the detection Hall elements at opposite angles are conducted, the Hall switch 108 is conducted.

[0076] The Hall switch 108 is used in combination with the trigger switch 101, and a plurality of groups of detection Hall elements are arranged, when the contacted skin surface of the pig is perpendicular to the center line of the nozzle 107, the rearward movement amount of each point of the trigger switch 101 is the same, that is, the plurality of groups of detection Hall elements are simultaneously conducted, and then the driving assembly 2 is actuated, so that the jet flow of the medicine liquid ejected from the nozzle 107 during injection is perpendicular to the skin surface of the pig, and penetration is facilitated.

[0077] Conversely, if the center line of the nozzle 107 is not perpendicular to the skin surface of the pig, the detection Hall elements at opposite angles cannot be simultaneously conducted, and the driving assembly 2 does not execute the command, that is, injection is not performed.

[0078] The various embodiments are described in the specification by way of progression, each building on the last to facilitate ease of understanding. The same reference numerals are used throughout the drawings and like structure are denoted with like reference numerals.

[0079] The above has carried out the detailed introduction to the injection pressure adjustable needleless injection device provided by the utility model. The principle and implementation mode of the utility model are described by applying specific examples in this paper, and the above embodiment is only used for helping understanding the method and core idea of the utility model. It should be pointed out that, for ordinary skilled person in the art, on the premise of not departing from the principle of the utility model, the utility model can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the utility model claim.

Claims

1. A needle-free injection device with adjustable injection pressure, characterized in that: include: An injection assembly (1) comprises an injection chamber body (103) and a push rod piston (109), wherein the injection chamber body (103) is provided with an injection chamber, and the push rod piston (109) is sealingly and slidably mounted in the injection chamber; A drive assembly (2) comprising a push rod (202) and a power spring (203), wherein the push rod (202) is fixedly connected to the push rod piston (109), and the power spring (203) is connected to the push rod (202) for driving the push rod (202) to move during a release process after compression; A pressure regulating assembly (3) is connected to the power spring (203) and is used to adjust the position of the fixed end of the power spring (203) to change the initial compression deformation of the power spring (203).

2. The needle-free injection device with adjustable injection pressure according to claim 1, characterized in that: The pressure regulating assembly (3) comprises an adjusting push block (304) and a position-limiting adjusting sleeve (303), wherein the adjusting push block (304) and the position-limiting adjusting sleeve (303) are coaxially mounted via threads; The adjustment push block (304) abuts against the fixed end of the power spring (203); The limit adjustment sleeve (303) is relatively fixedly connected to the injection cavity body (103).

3. The needle-free injection device with adjustable injection pressure according to claim 2, characterized in that: The adjusting push block (304) is sleeved inside the limit adjustment sleeve (303), and a first retaining ring (309) is provided on the outer periphery of the adjusting push block (304), and a limit sleeve (307) is provided at the end of the limit adjustment sleeve (303) for limiting the maximum displacement of the first retaining ring (309); The limiting sleeve (307) is sleeved inside the limiting adjustment sleeve (303), and an annular groove is provided on the outer circumference. A threaded hole is provided at a corresponding position of the cylinder wall of the limiting adjustment sleeve (303) and the annular groove. A ball plunger (308) is provided in the threaded hole, the end of which is clamped in the annular groove.

4. The needle-free injection device with adjustable injection pressure according to claim 2, characterized in that: A pressure sensor (302) is provided between the adjustment push block (304) and the fixed end of the power spring (203) for monitoring the elastic force of the power spring (203).

5. The needle-free injection device with adjustable injection pressure according to claim 2, characterized in that: An adjustment rod (305) is coaxially arranged in the adjustment push block (304) via a spline structure, an end face gear (306) is fixedly arranged in the adjustment rod (305), and axially meshing gear teeth are arranged between the end face gear (306) and the end of the position-limiting adjustment sleeve (303).

6. The needle-free injection device with adjustable injection pressure according to claim 2, characterized in that: The driving assembly (2) further comprises a cam pin (208) and a plane cam (201), wherein the cam pin (208) is vertically connected to the push rod (202), the spiral circumferential surface of the plane cam (201) abuts against the circumferential surface of the cam pin (208), a motor (209) is connected to the axis of the plane cam (201), and the rotation axis of the plane cam (201) is perpendicular to the axis of the push rod (202).

7. The needle-free injection device with adjustable injection pressure according to claim 6, characterized in that: The pressure regulating assembly (3) further comprises a sleeve (311), and two ends of the sleeve (311) respectively abut against the fixed end of the power spring (203) and the adjusting push block (304); The push rod (202) is coaxially sleeved inside the power spring (203), and the free end thereof is inserted into the sleeve (311). The free end of the push rod (202) is provided with a rear fixing block (207) for fixing the cam pin (208).

8. The needle-free injection device with adjustable injection pressure according to any one of claims 1 to 7, characterized in that: The injection assembly (1) further includes a trigger switch (101) and a trigger spring (102), wherein the trigger switch (101) is sleeved on the outside of the nozzle (107) at the medicine outlet end of the injection chamber body (103), and the two ends of the trigger spring (102) are connected to the trigger switch (101) and the injection chamber body (103), and the trigger switch (101) is electrically connected to the control unit of the drive assembly (2).

9. The needle-free injection device with adjustable injection pressure according to claim 8, characterized in that: The trigger switch (101) and the nozzle (107) are clearance-fitted, a magnetic component is provided at the rear end of the trigger switch (101), and a Hall switch (108) is provided at the front end of the injection chamber body (103), and the Hall switch (108) is electrically connected to the control unit of the drive assembly (2); The Hall switch (108) includes a substrate arranged perpendicular to the center line of the nozzle (107) and a plurality of groups of detection Hall elements arranged in a circular array on the surface of the substrate. When the magnetic component is close to the detection Hall element, the detection Hall element is turned on. When the detection Hall element at the opposite corner is turned on, the Hall switch (108) is turned on.

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