Continuous feeding syringe for veterinary use

Abstract

The utility model relates to a continuous feeding injector for livestock. The continuous feeding injector comprises an injection tube, a piston head, a push rod, a grab handle, a pawl part, a locking part and a dose control part, and the dosage control part is sleeved on a cylinder body II arranged at the upper end of the fixed handle plate, so that the dosage control part can rotate relative to the cylinder body II. A plurality of limiting faces distributed in the circumferential direction are formed on the end face of the dosage control part, and the distances between the limiting faces and the end face of the free end of the second barrel body in the axial direction are different. And a vertical surface is formed at the upper end of the movable handle plate and is opposite to a limiting surface relatively moving to the lower part on the dose control part at an interval. Along with the action that the upper end of the movable handle plate gets close to the first cylinder body, the vertical face can gradually get close to the limiting face located on the lower portion and can make contact with the limiting face. According to the continuous quantitative injection device, the dosage injected every time can be accurately controlled, the dosage injected to each monomer in continuous injection operation tends to be consistent, and the operation effect of continuous quantitative injection is well improved.

Description

Technical Field

[0001] The utility model belongs to the field of livestock injection devices, and particularly relates to a veterinary continuous-feed syringe. Background Art

[0002] In the daily feeding and management of poultry and livestock farms, it is necessary to regularly vaccinate animals. The most commonly used drug administration method in vaccination operations is injection, and an epidemic prevention syringe is required. During epidemic prevention injection operations, first, the liquid medicine is inhaled into the injection tube of the syringe, and then the end of the push rod is pushed to cause the piston head installed at the other end of the push rod to inject the liquid medicine in the injection tube into the animal's body. Existing syringes are divided into two types: single injection and continuous injection. For a syringe for single injection drug administration, the liquid medicine contained in its injection tube can only be used for the dosage of a single animal. It is not only troublesome to operate but also has extremely low drug administration efficiency. Unless in special circumstances, it is generally not often used. For a syringe for continuous injection drug administration, it can continuously administer drugs to multiple animals in a cycle, and the dosage for each animal can be controlled by observing the scale on the injection tube. Therefore, although the existing continuous-feed syringe can administer drugs in a cyclic operation, because the dosage for a single animal needs to be visually controlled by observing the scale on the injection tube, there are defects such as inaccurate dosage for a single animal and relatively large errors. Content of the Utility Model

[0003] Aiming at the deficiencies of the previous continuous-feed syringes, the utility model provides a veterinary continuous-feed syringe, which can accurately control the dosage of each injection, making the dosage injected into each individual in continuous injection operations tend to be consistent, and better improving the operation effect of continuous quantitative injection.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a veterinary continuous-feed syringe, comprising an injection tube, a piston head, a push rod, a handle, a pawl part, a locking part, and a dosage control part.

[0005] The piston head is fixedly arranged at one end of the push rod and inserted into the lumen of the injection tube. Pushing and pulling the end of the push rod outside the injection tube can drive the piston head to reciprocate relative to the lumen of the injection tube, thereby completing the operations of sucking the liquid medicine into the lumen of the injection tube and injecting it from the injection end of the injection tube to the animal.

[0006] The handle includes a fixed handle plate and a movable handle plate, and the lower ends of the two handle plates are joined and matched. At this time, the overall handle is U-shaped. A cylinder one connected to the port of the injection tube is formed at the upper end of the fixed handle plate, and a cylinder two is formed on the cylinder one. The cylinder two extends away from the injection tube relative to the cylinder one.

[0007] One end of the push rod extending outside the injection tube passes through the first cylinder and the second cylinder and then extends to the outside. A shaft hole is formed in the first cylinder to match the push rod to guide the push rod to make a linear reciprocating movement along the axis.

[0008] A torsion spring member is provided at the lower parts of the fixed handle plate and the movable handle plate. The torsion spring member can act on the middle part of the movable handle plate with an elastic force to enable the upper end of the movable handle plate to make a reciprocating movement of approaching and moving away from the first cylinder.

[0009] The ratchet pawl part is installed at the upper end of the movable handle plate and can match with the ratchet tooth surface provided on the push rod. It can drive the push rod to make a one-way feeding movement relative to the injection tube along with the reciprocating movement of the upper end of the movable handle plate, and complete the operation of injecting the liquid medicine to the animal.

[0010] At least part of the locking part extends to the upper end of the movable handle plate and matches with the ratchet pawl part. It can control the position state of the ratchet pawl part, and can selectively switch the ratchet teeth on the ratchet pawl part between the state of maintaining matching with the ratchet tooth surface on the push rod and the state of disengaging from the matching, so as to realize that when the ratchet teeth and the ratchet tooth surface are in the state of disengaging from the matching, the push rod can move relative to the injection tube to the side opposite to the moving direction of the drug administration action, and realize the operation of sucking the liquid medicine into the lumen of the injection tube.

[0011] The dose control part is in a cylindrical shape and its hole is sleeved on the root of the second cylinder, so that the dose control part can rotate relative to the second cylinder around the axis.

[0012] On the end face of the dose control part on the same side as the free end of the second cylinder, a plurality of limiting surfaces distributed in the circumferential direction are formed. The distances of the respective limiting surfaces from the end face of the free end of the second cylinder in the axial direction are different. Along with the rotation action of the dose control part relative to the second cylinder, one of the limiting surfaces can be moved to the lower position of the dose control part.

[0013] A vertical surface is formed at the upper end of the movable handle plate and the vertical surface is spaced opposite to the limiting surface that has moved to the lower position on the dose control part. Along with the action of the upper end of the movable handle plate approaching the first cylinder, the vertical surface can gradually approach the limiting surface located below and can contact the limiting surface, and prevent the upper end of the movable handle plate from continuing to approach the first cylinder, thereby realizing the accurate control of the single-dose drug administration amount. After the single-dose drug administration is completed, release the hand's pressing on the movable handle plate, then under the action of the elastic force of the torsion spring member, it can push the movable handle plate to move, so that the upper end of the movable handle plate moves in the direction away from the first cylinder and finally returns to the original position.

[0014] By driving the dose control part to rotate relative to the second cylinder body, different limiting surfaces can be moved to the lower position, and can be selectively and respectively spaced relative to the vertical surface, so as to achieve the purpose of controlling the amount of the moving stroke of the vertical surface or the upper end of the moving handle plate toward one side of the first cylinder body, and to achieve the accurate control of the amount of single-dose administration.

[0015] Optionally, the distances of the respective limiting surfaces provided on the end surface of the dose control part from the end surface of the free end of the second cylinder body in the axial direction tend to decrease in a gradient manner in the clockwise direction. Rotating the dose control part to rotate it relative to the second cylinder body can switch to move a certain limiting surface to the lower part to be spaced relative to the vertical surface, so as to adjust and control the amount of the stroke of the vertical surface, that is, to achieve the adjustment and control of the amount of medicine fed each time.

[0016] Optionally, an external thread is formed in the middle of the outer peripheral surface of the second cylinder body, and a screw ring is provided in a matching manner at the external thread. The end surface of the screw ring facing the dose control part can contact the limiting surface closest to the end surface of the free end of the second cylinder body.

[0017] A conical surface is formed at the root of the second cylinder body. Correspondingly, a conical surface counterbore is formed on the end surface of the dose control part facing the first cylinder body.

[0018] The screw ring can axially push the dose control part to insert the conical surface into the conical surface counterbore. The root of the conical surface can contact the conical surface of the conical surface counterbore.

[0019] The above-provided screw ring, conical surface and conical surface counterbore can stably limit the dose control part at the root position of the second cylinder body, preventing the situation that the dose control part moves axially relative to the second cylinder body, and has a significant improvement effect on accurately and stably controlling the amount of single-dose administration.

[0020] Optionally, an end block is formed at the upper end of the moving handle plate, and the vertical surface is formed at the lower part of the inner end surface of the end block and protrudes outward relative to the inner end surface of the end block. The upper end surface of the end block is a plane and is formed with a pair of arm plates, and at the same time, a counterbore is formed on the plane between the two arm plates.

[0021] The ratchet teeth are formed at the upper part of the body of the ratchet pawl part. The lower end surface of the body contacts the upper end surface of the end block, and a protrusion extending downward is formed at the inner end of the lower end surface of the body. A spring is sleeved on the protrusion, and the lower end of the spring extends into the counterbore, and the end of the spring contacts the bottom surface of the counterbore.

[0022] The body is pivotally matched with two arm plates, enabling the body to make a flipping motion towards the inside relative to the end block by means of the elastic deformation of the spring, so that the push rod can make a one-way feeding motion relative to the injection tube.

[0023] A connecting rod extending outwardly is formed at the outer end of the body, and the end of the connecting rod is matched with the locking portion, enabling the locking portion to control the height position of the free end of the connecting rod, thereby controlling the magnitude of the flipping angle of the body relative to the upper end surface of the end block, and further enabling the ratchet pawl portion to selectively switch between a state where the push rod is restricted to a one-way feeding motion and a state where the ratchet pawl portion releases the restriction on the push rod.

[0024] Optionally, the locking portion includes a transmission rod, a first spring, a second spring, and a screw block. One end of the transmission rod is pivotally matched with the end of the connecting rod, and the other end is formed with a columnar block. An axially extending ejector rod is formed on the inner bottom surface of the screw block, and a disc body is formed at the free end of the ejector rod.

[0025] A cylindrical flange is formed at the lower part of the end block, and a cavity extending upward is formed from the lower end surface of the cylindrical flange. A through hole for the transmission rod to pass through is formed on the bottom surface of the cavity.

[0026] The first spring is sleeved on the transmission rod, with one end of the first spring contacting the upper end surface of the columnar block and the other end contacting the inner bottom surface of the cavity.

[0027] The screw block is matched with the cylindrical flange through a threaded structure, and the ejector rod extends into the cavity.

[0028] Both ends of the second spring respectively contact the upper end surface of the disc body and the lower end surface of the columnar block.

[0029] By screwing the screw block to control the threaded connection length between the screw block and the cylindrical flange, the upper end of the transmission rod can be driven to move up and down, and the body of the ratchet pawl portion can be driven to rotate relative to the end block in the counterclockwise direction or the clockwise direction.

[0030] The beneficial effects of the present utility model are as follows: This patent can accurately control the amount of medicine injected each time, making the amount of medicine injected into each monomer tend to be consistent during continuous injection operations, and preferably improving the operation effect of continuous quantitative injection. Description of the Drawings

[0031] Figure 1 It is a schematic diagram of the overall structure of this patent.

[0032] Figure 2 It is a schematic diagram of a partially enlarged structure.

[0033] Figure 3 Schematic side view structure of the dose control part.

[0034] Figure 4 Schematic front view structure of the dose control part.

[0035] In the figure: 10 injection tube; 20 piston head; 30 push rod, 31 ratchet surface; 40 handle, 41 fixed handle plate, 42 moving handle plate, 43 torsion spring member, 44 cylinder one, 441 conical surface, 45 cylinder two, 46 end block, 461 arm plate, 462 sinking groove, 463 vertical surface, 464 cylindrical flange; 50 ratchet pawl part, 51 body, 52 ratchet teeth, 53 protrusion, 54 connecting rod; 60 locking part, 61 transmission rod, 62 first spring, 63 second spring, 64 screw block, 641 ejector rod; 70 dose control part, 71 passage, 72 limiting surface, 721 first limiting surface, 722 second limiting surface, 723 third limiting surface, 724 fourth limiting surface, 73 conical surface counterbore. Detailed implementation manner

[0036] The structures, ratios, sizes, etc. shown in the accompanying drawings of the specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the implementable conditions of the present utility model. Therefore, they do not have technical essential significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the efficacy that the present utility model can produce and the purpose that can be achieved, should still fall within the scope covered by the technical content disclosed in the present utility model. At the same time, terms such as "upper", "lower", "front", "rear", "middle", etc. cited in this specification are only for the convenience of clear narration and are not used to limit the implementable scope of the present utility model. The change or adjustment of their relative relationship, without substantial change of the technical content, should also be regarded as the implementable scope of the present utility model.

[0037] As Figures 1 to 4 shown, a veterinary continuous feeding syringe includes an injection tube 10, a piston head 20, a push rod 30, a handle 40, a ratchet pawl part 50, a locking part 60 and a dose control part 70.

[0038] The piston head 20 is fixedly arranged at the left end of the push rod 30 and inserted into the lumen of the injection tube 10. Pushing and pulling the end of the push rod 30 that remains outside the injection tube 10 can drive the piston head 20 to reciprocate in the left-right direction relative to the lumen of the injection tube 10, and can complete the operation of sucking the liquid medicine into the lumen of the injection tube 10 and injecting it to an animal from the injection end (left end) of the injection tube 10.

[0039] The handle 40 includes a fixed handle plate 41 and a movable handle plate 42, and the lower ends of the two handle plates are joined and matched, making the overall handle 40 U-shaped. At the upper end of the fixed handle plate 41, a first cylinder 44 connected to the port (right port) of the injection tube 10 is formed, and a second cylinder 45 is formed on the first cylinder 44. The second cylinder 45 extends away from the injection tube 10 relative to the first cylinder 44 (i.e., extends relatively towards the right).

[0040] One end (right end) of the push rod 30 extending outside the injection tube 10 passes through the first cylinder 44 and the second cylinder 45 and then extends to the outside. A shaft hole matching the push rod 30 is formed on the first cylinder 44 to guide the push rod 30 to perform a linear reciprocating movement along the axis.

[0041] A torsion spring member 43 is provided at the lower part of the fixed handle plate 41 and the movable handle plate 42. The torsion spring member 43 can act with an elastic force in the middle of the movable handle plate 42 to enable the upper end of the movable handle plate 42 to perform a reciprocating action of approaching and departing from the first cylinder 44, that is, enabling the upper end of the movable handle plate 42 to perform a reciprocating swinging action to the left and right.

[0042] The pawl portion 50 is installed at the upper end of the movable handle plate 42 and can match with the ratchet tooth surface 31 provided on the push rod 30, and can drive the push rod 30 to perform a one-way feeding action relative to the injection tube 10 along with the reciprocating action of the upper end of the movable handle plate 42, completing the operation of injecting the liquid medicine to the animal.

[0043] At least part of the locking portion 60 extends to the upper end of the movable handle plate 42 and matches with the pawl portion 50, and can control the position state of the pawl portion 50, and can selectively switch the ratchet teeth 52 on the pawl portion 50 between a state of maintaining matching with the ratchet tooth surface 31 on the push rod 30 and a state of disengaging from the matching, so as to realize that when the ratchet teeth 52 and the ratchet tooth surface 31 are in a state of disengaging from the matching, the push rod 30 can move relative to the injection tube 10 towards the side opposite to the moving direction of the drug administration action (i.e., the push rod 30 moves to the right), realizing the operation of sucking the liquid medicine into the lumen of the injection tube 10.

[0044] The structures of the injection tube 10, the piston head 20, the push rod 30, the handle 40, the pawl portion 50 and the locking portion 60 and the cooperation relationship among them, except for the specific forms mentioned above, can also be replaced and substituted with reference to the prior art. Since this is not the main improvement point of this patent, no more detailed description will be given. The main core improvement point of this patent lies in the dose control portion 70 mentioned below, and the adaptive improvement made to some or multiple components of the push rod 30, the handle 40, the pawl portion 50 and the locking portion 60 for the installation of the dose control portion 70 and to better play its role.

[0045] The dose control part 70 is cylindrical, and its duct 71 is sleeved on the root of the second cylinder body 45, enabling the dose control part 70 to rotate relative to the second cylinder body 45 around the axis line. On the end face of the dose control part 70 on the same side as the free end of the second cylinder body 45, a plurality of limiting surfaces 72 are formed and distributed in the circumferential direction. Each limiting surface 72 (see Figure 3 , Figure 4 the first limiting surface 721, the second limiting surface 722, the third limiting surface 723 and the fourth limiting surface 724 shown) have different distances from the end face of the free end of the second cylinder body 45 in the axial direction. Along with the rotation of the dose control part 70 relative to the second cylinder body 45, one of the limiting surfaces 72 can be moved to the lower position of the dose control part 70.

[0046] On the upper end of the movable handle plate 42, a vertical surface 463 is formed, and the vertical surface 463 is spaced opposite to the limiting surface 72 that moves to the lower position on the dose control part 70. Along with the movement of the upper end of the movable handle plate 42 towards the first cylinder body 44, the vertical surface 463 can gradually approach the limiting surface 72 located below and can contact the limiting surface 72, thereby preventing the upper end of the movable handle plate 42 from continuing to move towards the first cylinder body 44, and further realizing the accurate control of the single-dose amount. After a single dose is administered, when the hand releases the pressing on the movable handle plate 42, under the elastic force of the torsion spring member 43, the movable handle plate 42 can be pushed to move, so that the upper end of the movable handle plate 42 moves away from the first cylinder body 44 and finally returns to its original position.

[0047] By driving the dose control part 70 to rotate relative to the second cylinder body 45, different limiting surfaces 72 can be moved to the lower position, and the first limiting surface 721, the second limiting surface 722, the third limiting surface 723 or the fourth limiting surface 724 can be selectively spaced opposite to the vertical surface 463 respectively, so as to achieve the purpose of controlling the amount of the moving stroke of the vertical surface 463 or the upper end of the movable handle plate 42 towards the first cylinder body 44 side, and to realize the accurate control of the single-dose amount.

[0048] The distances of the respective limiting surfaces 72 provided on the (right) end face of the dose control part 70 from the end face of the free end of the second cylinder body 45 in the axial direction show a trend of gradually decreasing in a clockwise gradient. Rotating the dose control part 70 to make it rotate relative to the second cylinder body 45 can switch to move a certain limiting surface 72 to the lower position and be spaced opposite to the vertical surface 463, so as to adjust and control the amount of the moving stroke of the vertical surface 463, that is, to realize the adjustment and control of the amount of the medicine fed in a single time.

[0049] An external thread is formed in the middle of the outer circumferential surface of the second cylinder 45, and a spiral ring (not shown in the figure) is matched with the external thread. The end face of the spiral ring facing the dosage control part 70 can contact the limiting surface 72 (i.e., the fourth limiting surface 724 shown in the figure) closest to the free end face of the second cylinder 45. A conical surface 441 is formed at the root of the second cylinder 45, and correspondingly, a conical surface countersunk hole 73 is formed on the end face of the dosage control part 70 facing the first cylinder 44. The spiral ring can push the dosage control part 70 in the axial direction so that the conical surface 441 is inserted into the conical surface countersunk hole 73. The root of the conical surface 441 can contact the conical surface of the conical surface countersunk hole 73.

[0050] The spiral ring, conical surface 441 and conical countersunk hole 73 provided in the upper scheme can stably limit the dosage control part 70 to the root position of the cylinder 45, thereby preventing the dosage control part 70 from moving in the axial direction relative to the cylinder 45, and having a significant improvement effect on accurately and stably controlling the amount of a single dose.

[0051] The upper end of the movable handle plate 42 is formed with an end block 46, and the vertical surface 463 is formed at the lower part of the inner end surface of the end block 46 and protrudes outward relative to the inner end surface of the end block 46. The upper end surface of the end block 46 is a plane and is formed with a pair of arm plates 461, and a sink groove 462 is formed on the plane located between the two arm plates 461.

[0052] The ratchet teeth 52 are formed on the upper portion of the body 51 of the pawl portion 50. The lower end surface of the body 51 contacts the upper end surface of the end block 46, and a protrusion 53 extending downward is formed at the inner end of the lower end surface of the body 51. A spring is mounted on the protrusion 53, and the lower end of the spring extends into the sink 462, and the end of the spring contacts the bottom surface of the sink 462.

[0053] The main body 51 is pivotally matched with the two arm plates 461, so that the main body 51 can provide a clearance space with the help of the elastic deformation of the spring, prompting the main body 51 to flip inward relative to the end block 46, and the push rod 30 can perform a unidirectional feeding action relative to the injection tube 10.

[0054] A connecting rod 54 extending outward is formed at the outer end of the main body 51, and the end of the connecting rod 54 matches the locking portion 60, so that the locking portion 60 can control the height position of the free end of the connecting rod 54, thereby realizing the control of the flipping angle of the main body 51 relative to the upper end surface of the end block 46, and further, the pawl portion 50 can be selectively switched between a state in which the push rod 30 can be limited to a unidirectional feeding action and a state in which the pawl portion 50 releases the limitation on the push rod 30.

[0055] The locking portion 60 includes a transmission rod 61, a first spring 62, a second spring 63, and a screw block 64. One end of the transmission rod 61 is pivotally matched with the end of the connecting rod 54, and the other end is formed with a columnar block. An axially extending ejector rod 641 is formed on the inner bottom surface of the screw block 64, and a disc body is formed at the free end of the ejector rod 641.

[0056] A cylindrical flange 464 is formed at the lower part of the end block 46, and a cavity extending upward is formed from the lower end surface of the cylindrical flange 464. A through hole for the transmission rod 61 to pass through is formed on the bottom surface of the cavity.

[0057] The first spring 62 is sleeved on the transmission rod 61, and one end of the first spring 62 contacts the upper end surface of the columnar block, and the other end contacts the inner bottom surface of the cavity. The screw block 64 is matched with the cylindrical flange 464 through a threaded structure, and the ejector rod 641 extends into the cavity. Both ends of the second spring 63 contact the upper end surface of the disc body and the lower end surface of the columnar block respectively.

[0058] By screwing the screw block 64 to control the threaded connection length between the screw block 64 and the cylindrical flange 464, the upper end of the transmission rod 61 can be driven to move up and down, and the body 51 of the ratchet portion 50 can be driven to rotate relative to the end block 46 in the counterclockwise or clockwise direction.

[0059] The transmission rod 61 pushes the free end of the connecting rod 54 upward to move the lower end surface of the body 51 partially away from the upper plane of the end block 46. When the spring sleeved on the protrusion 53 undergoes a large compression deformation, the ratchet teeth 52 can be disengaged from the matching with the ratchet surface 31, enabling the push rod 30 to move to the right relative to the syringe tube 10, and the medicinal liquid is inhaled into the lumen of the syringe tube 10. After the inhalation operation of the medicinal liquid is completed, when the upper end of the transmission rod 61 is driven to move downward (mainly by the stretching elastic force of the first spring 62), the body 51 can be driven to rotate clockwise through the connecting rod 54, gradually re - establishing the matching relationship between the ratchet teeth 52 and the ratchet surface 31, and preventing the push rod 30 from moving to the right relative to the syringe tube 10. At this time, the push rod 30 can only move to the left relative to the syringe tube 10, maintaining the state of one - way feeding and delivering medicine.

[0060] Such as Figure 1 、 Figure 2As shown, a channel structure is formed on the second cylinder body 45 for the ratchet teeth 52 on the ratchet pawl portion 50 to extend into the cavity of the second cylinder body 45 through the channel structure and match with the ratchet tooth surface 31. The channel structure is a through groove extending along the axial direction of the second cylinder body 45.

[0061] The above embodiments are only illustrative of the principles and effects of the present invention and are not intended to limit the present invention. There are many aspects of the present invention that can be improved without departing from the overall idea. Those familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A veterinary continuous-feed syringe, comprising an injection tube, a piston head, a push rod, a handle, a pawl portion and a locking portion; the piston head is arranged at one end of the push rod and inserted into the injection tube; the handle comprises a fixed handle plate and a movable handle plate, and a torsion spring member is arranged at the lower ends of the two handle plates, and the torsion spring member can act on the middle part of the movable handle plate with an elastic force to enable the upper end of the movable handle plate to make a reciprocating swinging motion; a first cylinder body connected to the injection tube is formed at the upper end of the fixed handle plate, and a second cylinder body is formed on the first cylinder body; the other end of the push rod passes through the first cylinder body and the second cylinder body and then extends to the outside; the pawl portion is installed at the upper end of the movable handle plate, can be matched with a ratchet tooth surface arranged on the push rod, and can drive the push rod to make a one-way feeding motion along with the reciprocating motion of the upper end of the movable handle plate; the locking portion is matched with the pawl portion, can control the position state of the pawl portion, and can selectively switch the ratchet teeth on the pawl portion between a state of remaining matched with the ratchet tooth surface and a state of being disengaged from the match; characterized in that: It further includes a dose control part; The dose control part is cylindrical and its hole is sleeved on the root of the second cylinder body, enabling the dose control part to rotate relative to the second cylinder body; On the end face of the dose control part on the same side as the free end of the second cylinder body, a plurality of limiting surfaces distributed in the circumferential direction are formed, and the distances of the limiting surfaces from the end face of the free end of the second cylinder body in the axial direction are different; when the dose control part makes a rotational movement relative to the second cylinder body, one of the limiting surfaces can be selectively moved relative to the lower part of the dose control part; A vertical surface is formed at the upper end of the movable handle plate, and the vertical surface is spaced opposite to the limiting surface that has moved to the lower part on the dose control part; as the upper end of the movable handle plate moves closer to the first cylinder body, the vertical surface can gradually approach the limiting surface located below and can contact the limiting surface.

2. The veterinary continuous feeding syringe according to claim 1, wherein: The distances of the respective limiting surfaces provided on the end face of the dose control part from the end face of the free end of the second cylinder body in the axial direction show a tendency of gradually decreasing in a clockwise gradient.

3. The veterinary continuous feeding syringe according to claim 1 or 2, characterized in that: External threads are formed in the middle of the outer peripheral surface of the second cylinder body, and a screw ring is provided in a matching manner at the external thread part; the end face of the screw ring facing the dose control part can contact the limiting surface closest to the end face of the free end of the second cylinder body; A conical surface is formed at the root of the second cylinder body. Correspondingly, a conical surface counterbore is formed on the end face of the dose control part facing the first cylinder body; the screw ring can axially push the dose control part to insert the conical surface into the conical surface counterbore and make the root of the conical surface contact the conical surface of the conical surface counterbore.

4. The veterinary continuous-feed syringe according to claim 1, wherein: An end block is formed at the upper end of the movable handle plate, and the vertical surface is formed at the lower part of the inner end face of the end block and protrudes outward relative to the inner end face of the end block; The upper end face of the end block is a plane and is formed with a pair of arm plates extending upward, and a sunk groove is formed on the plane between the two arm plates; Ratch teeth are formed at the upper part of the body of the pawl part; the lower end face of the body contacts the upper end face of the end block, and a protrusion extending downward is formed at the inner end of the lower end face of the body; a spring is sleeved on the protrusion, and the lower end of the spring extends into the sunk groove and contacts the bottom surface of the sunk groove; the body is pivotally matched with the two arm plates, enabling the body to make a flipping movement inward relative to the end block by means of the elastic deformation of the spring; A connecting rod extending outward is formed at the outer end of the body, and the end of the connecting rod is matched with the locking part, enabling the locking part to control the height position of the free end of the connecting rod, realize the control of the flipping angle size of the body relative to the upper end face of the end block, and further enable the pawl part to selectively switch between a state where the push rod can be limited to make a one-way feeding movement and a state where the pawl part releases the limitation on the push rod.

5. The veterinary continuous feeding syringe according to claim 4, wherein: The locking part includes a transmission rod, a first spring, a second spring, and a screw block; One end of the transmission rod is pivotally matched with the end of the connecting rod, and the other end is formed with a column block; An axially extending ejector rod is formed on the inner bottom surface of the screw block, and a disc body is formed at the free end of the ejector rod; A cylindrical flange is formed at the lower part of the end block, and a cavity extending upward is formed from the lower end face of the cylindrical flange; a through hole for the transmission rod to pass through is formed on the bottom surface of the cavity; The first spring is sleeved on the transmission rod, and one end of the first spring contacts the upper end face of the column block, and the other end contacts the inner bottom surface of the cavity; The screw block is matched with the cylindrical flange through a threaded structure, and the ejector rod extends into the cavity; Both ends of the second spring are respectively in contact with the upper end surface of the disc body and the lower end surface of the column block.

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