CN111135435A - Self-priming injection booster - Google Patents

Abstract

The invention provides a self-priming injection booster, which is characterized in that: the inner cavity of the gun body I is provided with a supporting plate and a sleeve, an arc groove is arranged above the gun body I, and the gun body II is fixed on the outer surface of the gun shell II; two ends of a trigger shaft provided with a trigger are respectively supported on a gun body I and a gun body II, one end of a spring is respectively hung on a pin shaft I of the gun body I and a pin shaft II of the gun body II, the other end of the spring is respectively hung on a pin shaft III of the trigger, and the extending end of a boosting rod which penetrates through a support plate II and is sleeved with 2 clamping sleeves and boosting sleeves is inserted into a sleeve I; a shifting fork shaft fixed with a shifting fork is respectively supported in the middle parts of the gun body I and the gun body II, pin shafts IV of the 2 boosting sleeves are respectively positioned in U-shaped grooves of the shifting fork, one end of each chain sheet is hinged in the middle part of the shifting fork, and the other end of each chain sheet is hinged at two ends of each chain pin; the injection tube is arranged in the arc groove of the gun body I, one end of the plunger rod, which is provided with the plunger, is inserted into the injection tube, and the other end of the plunger rod is connected with the end part of the boosting rod. The invention has the advantages of convenient operation and easy and accurate control of the quantity of the injection and the inhalation liquid.

Description

Self-priming injection booster

Technical Field

The invention provides a self-priming injection booster, which belongs to the field of medical instruments and equipment, is mainly used for boosting and pressurizing work when liquid is injected into a patient, and can also be used for work such as dispensing before transfusion and the like.

Background

When a lying-in woman is produced, in order to shorten the production process and reduce the pain of the lying-in woman, the disposable cervical dilatation balloon is generally placed in the uterus and the vagina of the lying-in woman, and then liquid is slowly injected into the disposable cervical dilatation balloon through the infusion tube to gradually expand the disposable cervical dilatation balloon, so that the effect of dilating the cervical orifice and the vagina is achieved, and the smooth production of a fetus is facilitated.

At present, most of common injection boosting instruments are plunger type injectors, injection and input of liquid are completed by manual pushing of nurses, labor intensity is high, and the quantity of the input liquid is not easy to control accurately. When the amount of the liquid which is input is too large, the pregnant woman can be more painful, otherwise, the function of expanding the cervical orifice and the vagina can not be achieved. Therefore, Zibo scientific medical instrument limited invented a manual injection booster (application number: 202010080463.9) which can better complete the injection work of liquid. However, the force-reducing operation system of the booster is realized by pulling the trigger and then transmitting the trigger through the components such as the chain, the shift fork and the like, and the force-reducing operation system can only be used for injecting liquid. Therefore, the suction of the liquid is still laborious and the quantity of the liquid sucked is not easy to control precisely.

In view of the current situation of the medical apparatus industry, a self-priming injection booster which is time-saving and labor-saving in operation and easy in control of the quantity of injection liquid is urgently needed.

Disclosure of Invention

The invention aims to provide a self-priming injection booster which can overcome the problems of the prior art and the prior equipment, is time-saving and labor-saving in operation and is easy to accurately control the quantity of injected and sucked liquid.

The technical scheme is as follows: the injection device comprises an injector and a boosting gun, wherein the injector comprises an injection tube, a plunger and a plunger rod, the injection tube is in a transparent state, one end of the injection tube is closed, the excircles at the two ends of the injection tube are respectively provided with a convex shoulder, and the two sides of the outer cylindrical surface of the injection tube are provided with 0 line of scale marks positioned at the closed end along the length direction of the injection tube; the end part of the closed end of the injection tube extends outwards to form a section of conical tube, the conical tube is positioned on the symmetrical surface of the scale marks on the two sides, the outer diameter of one end, close to the injection tube, of the conical tube is large, the outer diameter of one end, far away from the injection tube, of the conical tube is small, and the axis of the conical tube is parallel to the axis of the injection tube; the outer diameter of the plunger is larger than the inner diameter of the injection tube, the difference value between the outer diameter of the plunger and the inner diameter of the injection tube is equal to 0.2mm-0.5mm, one end of the plunger rod is provided with the plunger, and the end provided with the plunger is inserted into the injection tube from the opening end of the injection tube; the boosting gun comprises a gun body and a boosting mechanism, wherein the gun body comprises a gun body I and a gun body II, the gun body I comprises a gun shell I and a gun shell II which are bilaterally symmetrical, a supporting plate and a sleeve, inner cavities of the gun shell I and the gun shell II are hollow and in a thin shell shape or a pistol shape, and the whole gun shell I and the gun shell II are divided into a gun body at the middle part, a gun barrel at the front part, a tail part far away from the rear upper part of the gun barrel and a gun handle positioned below; a bearing plate I is arranged in the inner cavity of the joint part of the gun barrel and the gun body, a bearing plate II is arranged in the inner cavity of the joint part of the tail part and the gun body, and round holes are formed in the bearing plate I and the bearing plate II and are coaxial with each other through 2 round holes; a sleeve I is arranged between the support plate I and the foremost end of the inner cavity of the gun barrel, a sleeve II is arranged between the support plate II and the rearmost end of the inner cavity of the tail part, and the axes of the sleeve I and the sleeve II are coaxial with the common axis of the round holes on the support plate I and the support plate II; the outermost ends of the tail parts of the gun shell I and the gun shell II are provided with round holes, the centers of the round holes are positioned on the axis of the sleeve II, the diameters of the round holes are equal to the inner diameter of the sleeve II, the inner surfaces of the gun body parts of the gun shell I and the gun shell II respectively extend 1 pin shaft I inwards, and 2 pin shafts I are coaxial; the middle part above the gun body I is provided with an arc groove which is smaller than a semicircle, the radius of the arc groove is equal to half of the outer diameter of the injection tube, the length of the arc groove is smaller than the total length from the front end of the gun barrel to the tail part of the gun shell, and the axis of the arc groove is parallel to the common axis of the sleeve I and the sleeve II; the gun shell II is provided with a rectangular groove with the long side parallel to the gun barrel, the symmetrical surface of the rectangular groove in the width direction is superposed with a plane perpendicular to the symmetrical surface of the gun body I and made by the axis of the sleeve I, and the width of the rectangular groove is equal to the distance between the bilaterally symmetrical inner surfaces of the gun shell I and the gun shell II; the gun body II comprises a gun shell III and a gun shell IV which are symmetrical, inner cavities of the gun shell III and the gun shell IV are in hollow thin shell shapes and gun handle shapes, the whole gun shell III and the whole gun shell IV are divided into a gun body positioned above and a gun handle positioned below, the uppermost plane of the gun body part far away from the gun handle is in an open shape, and the inner surfaces of the gun body parts of the gun shell III and the gun shell IV respectively extend inwards to form 1 pin shaft II; an opening at the top of a gun body part of the gun body II is aligned with a rectangular groove on the gun shell II and fixed on the outer surface of the gun shell II, a symmetrical surface of the gun body II is positioned in a plane which is perpendicular to the symmetrical surface of the gun body I and is formed by an axis of the sleeve I, and the tail end of a gun handle of the gun body II, far away from the gun body part, is opposite to the inclination direction of the gun body part, far away from the gun body part, of the gun handle of the gun body I, along the axis direction of the sleeve I; the boosting mechanism comprises a trigger, a spring, a clamping sleeve, a boosting rod, a shifting fork and a chain sheet, wherein the trigger is in a diamond shape, and two side surfaces of a diamond corner with a longer extending length, which are vertical to the plane direction of the diamond shape, are respectively in concave arc shapes and convex arc shapes; the middle part of the trigger is provided with a round hole with the axis vertical to the rhombic plane, the rhombus extending out of the opposite angle of the longer rhombus is also provided with a round hole, the axes of 2 round holes are parallel, one side of the middle part of the trigger, which is close to one end of the longer rhombus and is close to the convex cambered surface of the longer rhombus, extends 1 pin shaft III to the two sides along the direction vertical to the rhombic plane respectively, 2 pin shafts III are coaxial, and the axis of the pin shaft III is parallel to the axis of the round hole in the middle part of; the trigger is arranged in the middle of the trigger shaft through a circular hole in the middle, a chain pin is arranged in another circular hole of the trigger, two ends of 1 trigger shaft are respectively supported at the gun body positions, close to the gun barrel, of the gun shell I and the gun shell II, when one end, extending out of the longer water caltrop, of the trigger faces the gun handle, the concave cambered surface, extending out of the longer water caltrop, of the trigger faces one side of the gun barrel, two ends of the other 1 trigger shaft are respectively supported at the gun body positions, far away from the gun barrel of the gun body I, of the gun shell III and the gun shell IV, and when one end, extending out of the longer water caltrop, of the trigger faces the gun; the spring is a torsional spring and is provided with a left spring and a right spring which are symmetrical, the spring wires at two ends of the 4 springs respectively extend out of 1 section of straight line section along the radial direction of the spring, the tail ends of the straight line sections are provided with a winding lug, the winding lugs at one end of each 1 spring which is symmetrical in the left direction and the right direction are respectively sleeved and hung on pin shafts I arranged on the inner surfaces of a gun shell I and a gun shell II, the winding lugs at the other end are respectively sleeved and hung on pin shafts III arranged on two side surfaces of a trigger in the gun body I, the winding lugs at one end of the other 1 pair of springs which are symmetrical in the left direction and the right direction are respectively sleeved and hung on pin shafts II arranged on the inner surfaces of the gun shell III and the gun shell IV, and the winding lugs; the outer circle of one end of the cylindrical clamping sleeve is provided with a convex shoulder, the other end of the cylindrical clamping sleeve is provided with an outer conical pipe section, the large end of the outer conical pipe section is far away from the cylindrical pipe section of the clamping sleeve, the diameter of the small end of the outer conical pipe section is equal to the outer diameter of the cylindrical pipe section of the clamping sleeve, the clamping sleeve is uniformly cut with a plurality of grooves along the circumferential direction of the clamping sleeve, two sides of the middle part of the outer circle of the boosting sleeve which is in a circular pipe shape and has the inner diameter equal to the outer diameter of the cylindrical pipe section of the clamping sleeve symmetrically extend outwards respectively with 1; the auxiliary push rod is inserted into the sleeve II from the tail part of the gun body I, 2 clamping sleeves are sleeved at the extending end penetrating through the support plate II, one end, with a cut groove, of one clamping sleeve 1 close to the support plate II faces one side of the gun barrel, and one end, with a cut groove, of the other clamping sleeve 1 close to the support plate I is back to one side of the gun barrel; the outer circles of the 2 clamping sleeves are all sleeved with the boosting sleeve, and the extending end of the boosting rod after penetrating through the 2 clamping sleeves and the boosting sleeve is inserted into the sleeve I; one end of a shifting fork in a rectangular flat plate shape is provided with a U-shaped groove, the symmetrical plane of the U-shaped groove is superposed with the symmetrical plane of the width direction of the rectangular plate surface of the shifting fork, the other end and the middle part of the shifting fork are both provided with round holes, the axes of 2 round holes are positioned on the symmetrical plane of the width direction of the rectangular plate surface of the shifting fork, 2 shifting forks are respectively fixed at the two ends of a shifting fork shaft through the round holes at one end, the axes of the round holes at the middle parts of the 2 shifting forks are coaxial, and the symmetrical planes of the U-shaped groove at; the 1 assembly after the shifting fork and the shifting fork shaft are assembled is respectively supported at the positions, close to the tail, of gun bodies of a gun shell I and a gun shell II of the gun body I through the extending ends, penetrating through the shifting fork, of two ends of the shifting fork shaft, and 2 pin shafts IV extending from the outer circle of a boosting sleeve close to the supporting plate II are respectively positioned in U-shaped grooves of the 2 shifting forks; one end of each of the 2 pieces of chain sheets is hinged in a round hole in the middle of each of the 2 pieces of shifting forks through a pin shaft V, and the other end of each of the 2 pieces of chain sheets is hinged at two ends of a chain pin arranged on a trigger in the gun body I; the assembled other 1 shifting fork and shifting fork shaft assembly is respectively supported at the gun body I position of the gun shell III and the gun body IV of the gun body II close to the gun body I through the extending ends of the two ends of the shifting fork shaft penetrating through the shifting fork, and 2 pin shafts IV extending from the excircle of the boosting sleeve close to the support plate I position are respectively positioned in the U-shaped grooves of the 2 shifting forks; one end of each of the 2 pieces of chain sheets is hinged in a round hole in the middle of each of the 2 pieces of shifting forks through a pin shaft V, and the other end of each of the 2 pieces of chain sheets is hinged at two ends of a chain pin arranged on a trigger in the gun body II; the injection tube both ends are installed in the circular arc inslot of rifle body I top through the clamp, and stretch out the one end of circular cone pipe and keep away from the direction of body of a gun one end towards the barrel, and the end that stretches out behind the plunger rod inserted the injection tube is through the end connection that the barrel was kept away from to the boosting pole that inserts in rifle body I.

On the basis of the prior art, the injection tube is in a transparent state, one end of the injection tube is closed, the outer circles of the two ends of the injection tube are provided with convex shoulders, and the two sides of the outer cylindrical surface of the injection tube are provided with scale marks with 0 line positioned at the closed end along the length direction of the injection tube; the end part of the closed end of the injection tube extends outwards to form a section of conical tube, the conical tube is positioned on the symmetrical surface of the scale marks on the two sides, the outer diameter of one end, close to the injection tube, of the conical tube is large, the outer diameter of one end, far away from the injection tube, of the conical tube is small, and the axis of the conical tube is parallel to the axis of the injection tube; the outer diameter of a plunger made of medical rubber is larger than the inner diameter of the injection tube, the difference value between the outer diameter of the plunger and the inner diameter of the injection tube is equal to 0.2mm-0.5mm, one end of the plunger rod is provided with the plunger, and the end provided with the plunger is inserted into the injection tube from the open end of the injection tube. The inner cavities of a gun shell I and a gun shell II of the gun body I are hollow and in a 'thin shell' shape or a 'pistol' shape, and the whole gun shell I and the whole gun shell II are divided into a gun body at the middle part, a gun barrel at the front part, a tail part far away from the rear upper part of the gun barrel and a gun handle positioned below; a bearing plate I is arranged in the inner cavity of the joint part of the gun barrel and the gun body, a bearing plate II is arranged in the inner cavity of the joint part of the tail part and the gun body, and round holes are formed in the bearing plate I and the bearing plate II and are coaxial; a sleeve I is arranged between the support plate I and the foremost end of the inner cavity of the gun barrel, a sleeve II is arranged between the support plate II and the rearmost end of the inner cavity of the tail part, and the axes of the sleeve I and the sleeve II are coaxial with the common axis of the round holes on the support plate I and the support plate II; the outermost ends of the tail parts of the gun shell I and the gun shell II are provided with round holes, the centers of the round holes are positioned on the axis of the sleeve II, the diameters of the round holes are equal to the inner diameter of the sleeve II, the inner surfaces of the gun body parts of the gun shell I and the gun shell II respectively extend 1 pin shaft I inwards, and 2 pin shafts I are coaxial; the middle part of the upper part of the gun body I is provided with an arc groove which is smaller than a semicircle, the radius of the arc groove is equal to half of the outer diameter of the injection tube, the length of the arc groove is smaller than the total length from the front end of the gun barrel to the tail part of the gun shell, and the axis of the arc groove is parallel to the common axis of the sleeve I and the sleeve II. The gun shell II is provided with a rectangular groove with a long edge parallel to the gun barrel, the symmetrical surface of the rectangular groove in the width direction coincides with a plane perpendicular to the left and right symmetrical surfaces of the gun body I and made through the axis of the sleeve I, and the width of the rectangular groove is equal to the distance between the inner surfaces of the gun shell I and the gun shell II which are symmetrical. The inner cavities of a gun shell III and a gun shell IV of the gun body II are hollow and in a shape of a thin shell and a gun handle, the whole gun shell III and the whole gun shell IV are divided into a gun body positioned above and a gun handle positioned below, the uppermost plane of the gun body part far away from the gun handle is in an open shape, and the inner surfaces of the gun body parts of the gun shell III and the gun shell IV respectively extend 1 pin shaft II inwards; the gun body II is fixed on the outer surface of the gun shell II, the uppermost opening of the gun body part of the gun body II is aligned to the rectangular groove on the gun shell II, the symmetry plane of the gun body II coincides with the plane perpendicular to the symmetry plane of the gun body I through the axis of the sleeve I, and the inclination directions of the tail end of a gun handle, far away from the gun body part, of the gun body II and the tail end of a gun handle, far away from the gun body part, of the gun body I in the axis direction of the sleeve I are opposite to each other. The trigger of the boosting mechanism is in a diamond shape, and two side surfaces of the extended long water caltrop, which are vertical to the plane direction of the diamond, are respectively in concave and convex arc shapes; round holes with axes vertical to the diamond plane are arranged in the middle of the trigger and at the diamond corners extending out of the opposite angles of the longer diamond corners, the middle of the trigger is close to one end of the longer diamond corners and one side of the convex cambered surface close to the longer diamond corners extends out 1 pin shaft III to the two sides along the direction vertical to the diamond plane, 2 pin shafts III are coaxial, and the axes of the pin shafts III are parallel to the axes of the round holes in the middle of the trigger; the trigger is arranged in the middle of the trigger shaft through a circular hole in the middle, a chain pin is arranged in another circular hole of the trigger, two ends of 1 trigger shaft are respectively supported at the gun body parts of the gun shell I and the gun shell II close to the gun barrel, and when one end of the trigger extending out of the longer water caltrop faces to the gun handle, the concave cambered surface of the trigger extending out of the longer water caltrop faces to one side of the gun barrel; in addition, two ends of 1 trigger shaft are respectively supported at the gun body of the gun shell III and the gun shell IV and far away from the gun barrel of the gun body I, and when one end of the trigger extending out of the longer water caltrop faces the gun handle, the concave cambered surface of the trigger extending out of the longer water caltrop faces back to one side of the gun barrel of the gun body I. The spring is a torsional spring and is provided with 2 left-handed and right-handed symmetric springs, spring wires at two ends of 4 springs respectively extend out of 1 section of straight line section along the radial direction of the spring, the tail ends of the straight line sections are respectively provided with a lug, the lugs at one end of each 1 left-handed and right-handed symmetric springs are respectively sleeved and hung on pin shafts I arranged on the inner surfaces of a gun shell I and a gun shell II, the lugs at the other end are respectively sleeved and hung on pin shafts III arranged on two side surfaces of a trigger in the gun body I, the lugs at one end of the other 1 pair of left-handed and right-handed symmetric springs are respectively sleeved and hung on pin shafts II arranged on the inner surfaces of the gun shell III and the gun shell IV, and the lugs at the other end are respectively sleeved and hung on pin shafts III. The outer circle of one end of the cylindrical clamping sleeve is provided with a convex shoulder, the other end of the cylindrical clamping sleeve is provided with an outer conical pipe section, the large end of the outer conical pipe section is far away from the cylindrical pipe section of the clamping sleeve, the diameter of the small end of the outer conical pipe section is equal to the outer diameter of the cylindrical pipe section of the clamping sleeve, and the clamping sleeve is uniformly cut with a plurality of grooves along the circumferential direction of the clamping sleeve; the two sides of the middle part of the excircle of the boosting sleeve which is in a circular tube shape and has the inner diameter equal to the outer diameter of the cylindrical pipe section of the clamping sleeve symmetrically extend outwards for 1 pin shaft IV respectively, and 2 pin shafts IV are coaxial; the auxiliary push rod is inserted into the sleeve II from the tail part of the gun body I, 2 clamping sleeves are sleeved at the extending end penetrating through the support plate II, one end, with a cut groove, of one clamping sleeve 1 close to the support plate II faces one side of the gun barrel, and one end, with a cut groove, of the other clamping sleeve 1 close to the support plate I is back to one side of the gun barrel; the outer circles of the 2 clamping sleeves are all sleeved with the boosting sleeve, and the extending end of the boosting rod after penetrating through the 2 clamping sleeves and the boosting sleeve is inserted into the sleeve I; one end of the shifting fork in a rectangular flat plate shape is provided with a U-shaped groove, the symmetrical surface of the U-shaped groove is superposed with the symmetrical surface of the rectangular plate surface of the shifting fork in the width direction, the other end and the middle part of the shifting fork are provided with round holes, and the axes of the 2 round holes are positioned on the symmetrical surface of the rectangular plate surface of the shifting fork in the width direction; the 2 shifting forks are respectively fixed at two ends of a shifting fork shaft through a round hole at one end, the axes of the round holes in the middle of the 2 shifting forks are coaxial, and the symmetrical surfaces of the U-shaped grooves at one ends of the 2 shifting forks are superposed; the assembled assembly of the shifting fork and the shifting fork shaft is respectively supported at the positions, close to the tail, of gun bodies of a gun shell I and a gun shell II of a gun body I through the extending ends, penetrating through the shifting fork, of the two ends of the shifting fork shaft, and 2 pin shafts IV extending from the excircle of a boosting sleeve close to the supporting plate II are respectively positioned in U-shaped grooves of the 2 shifting forks; one end of each of the 2 pieces of chain sheets is hinged in a round hole in the middle of each of the 2 pieces of shifting forks through a pin shaft V, and the other end of each of the 2 pieces of chain sheets is hinged at two ends of a chain pin arranged on a trigger in the gun body I; the assembled other 1 shifting fork and shifting fork shaft assembly is respectively supported at the gun body I position of the gun shell III and the gun body IV of the gun body II close to the gun body I through the extending ends of the two ends of the shifting fork shaft penetrating through the shifting fork, and 2 pin shafts IV extending from the excircle of the boosting sleeve close to the support plate I position are respectively positioned in the U-shaped grooves of the 2 shifting forks; one end of each of the 2 pieces of chain sheets is hinged in a round hole in the middle of each of the 2 pieces of shifting forks through a pin shaft V, and the other end of each of the 2 pieces of chain sheets is hinged at two ends of a chain pin arranged on a trigger in the gun body II. The injection tube both ends are installed in the circular arc inslot of rifle body I top through the clamp, and stretch out the one end of circular cone pipe and keep away from the direction of body of a gun one end towards the barrel, and the end that stretches out behind the plunger rod inserted the injection tube is through the end connection that the barrel was kept away from to the boosting pole that inserts in rifle body I.

The working principle is as follows: a trigger of a boosting gun of the self-priming injection booster, which is positioned in a gun body I, is in an unbuckled or reset state, one end of a liquid conveying pipe is sleeved on a conical pipe of an injection pipe of the self-priming injection booster, and the other end of the liquid conveying pipe is inserted into a bottle filled with liquid. An operator holds the handle of the gun body II on the side face, and pulls the trigger in the gun body II with fingers, the trigger compresses the spring in the gun body II, and then pulls the shifting fork to swing around the shifting fork shaft and towards the direction far away from the gun barrel through the chain sheet in the gun body II; meanwhile, the shifting fork positioned in the gun body II shifts the boosting sleeve sleeved on the outer circle of the clamping sleeve positioned in the gun body I and close to one side of the gun barrel to slide towards the direction far away from the gun barrel through the U-shaped groove arranged at one end of the shifting fork. Because the end of the clamping sleeve far away from the gun barrel is provided with the outer conical pipe section, the large end of the outer conical pipe section is far away from the cylindrical pipe section of the clamping sleeve, the clamping sleeve is evenly cut with a plurality of grooves along the circumferential direction of the clamping sleeve, and the clamping sleeve has elasticity, when the boosting sleeve slides from the cylindrical section of the clamping sleeve to the outer conical section, the inner diameter of the boosting sleeve is smaller than the large end diameter of the outer conical pipe section of the clamping sleeve, so that the boosting sleeve gradually clamps the clamping sleeve on the boosting rod through the outer conical pipe section of the clamping sleeve, the boosting rod is driven, the plunger rod and the plunger are driven by the driving plate to move towards the direction far away from the closed end of the injection pipe, and therefore, liquid in the bottle is sucked into the injection pipe due to negative pressure formed by the increase of the volume of an inner cavity formed by the plunger.

The trigger of opening in rifle body II after accomplishing liquid suction once, the trigger resets under the effect of spring to drive the shift fork through the chain piece and swing towards the direction that is close to the barrel, and then drive the boosting cover through the U-shaped groove of shift fork one end and slide towards the direction that is close to the barrel. The outer conical pipe section at one end of the clamping sleeve and the elastic action ensure that the boosting sleeve loosens the clamping sleeve clamped on the boosting rod, so that the boosting sleeve cannot stir the clamping sleeve to slide at the beginning of the reset of the trigger, and the boosting rod stays at the original position without moving; only when the boosting sleeve contacts the outer circular convex shoulder of the clamping sleeve, the clamping sleeve is driven to slide by the convex shoulder. However, since the clamping sleeve does not clamp the push-aid rod, the plunger and the like will still stay in place, and the liquid pressure in the syringe will also remain unchanged. When the trigger in the gun body II is completely reset, the trigger is pulled again to repeat the action, namely, a part of liquid is sucked into the injection tube again. The liquid in the bottle can be continuously sucked into the injection tube by repeatedly pulling the trigger. The two sides of the outer cylindrical surface of the injection tube are provided with scale marks, so that the quantity of the sucked liquid can be accurately controlled, when the quantity of the liquid in the injection tube reaches the requirement, the trigger is stopped to be pulled, and then the infusion tube sleeved on the conical tube of the injection tube is pulled off.

The transfusion tube with the disposable cervical dilatation balloon which is placed in the puerpera body and extends outwards is sleeved on the conical tube of the injection tube, and the trigger positioned in the gun body II is in a state of being not buckled, namely in a reset state. An operator holds the gun handle of the gun body I by hand, pulls the trigger positioned in the gun body I by fingers, and drives the plunger rod and the plunger piston to move towards the closed end of the injection tube through the power transmission of all parts of the boosting mechanism, so that a part of liquid in the injection tube is injected into the disposable cervix dilatation balloon in the lying-in woman due to the increase of the pressure in the injection tube.

After the liquid injection is finished, the trigger in the gun body I is released, the trigger is reset under the action of the spring, and the boosting sleeve is driven to slide in the direction far away from the gun barrel through the power transmission of all parts of the boosting mechanism. For the same reasons as described above, the clamping sleeve does not grip the push-aid rod, and therefore the push-aid rod, as well as the plunger rod, plunger etc. will remain in place, and the liquid pressure in the syringe will remain unchanged. When the trigger in the gun body I is completely reset, the trigger is pulled again, and the actions can be repeated, namely, a part of liquid is injected into the disposable cervical dilatation balloon in the parturient. The trigger is repeatedly pulled for a plurality of times, and then the liquid can be continuously injected into the disposable cervical dilatation saccule. The scale lines arranged on the two sides of the outer cylindrical surface of the injection tube can accurately control the amount of the injected liquid, and the injection is finished when the cervix and the vagina of the parturient reach the expected expansion degree.

Compared with the current state of the art and the prior art, the invention is provided with the gun body II, the boosting mechanism with the same structure as that in the gun body I is arranged in the gun body II, the direction of the clamping sleeve is opposite to that of the clamping sleeve positioned in the gun body I, the large end of the outer conical pipe section at one end of the elastic clamping sleeve is far away from the cylindrical pipe section of the clamping sleeve, and a plurality of grooves are uniformly cut along the circumferential direction of the clamping sleeve, so that when the boosting sleeve slides to the outer conical section from the cylindrical section of the clamping sleeve, the clamping sleeve can be gradually clamped on the boosting rod to drive the boosting rod and drive the plunger to move through the driving plate, and the trigger positioned in the gun body II is pulled, so that the liquid in the bottle can be sucked into the injection tube, the labor intensity of operators is greatly reduced, and the quantity of the liquid sucked into the injection tube is easy to accurately control; similarly, the liquid in the injection tube can be injected into the disposable cervical dilatation balloon in the puerpera by pulling the trigger in the gun body I, so that time and labor are saved, and the labor intensity of operators is greatly reduced; because the scale marks are arranged on the two sides of the outer cylindrical surface of the injection tube, the quantity of the injected liquid can be accurately controlled, the pain of the lying-in woman caused by the overlarge quantity of the injected liquid can be avoided, and the cervical orifice and the vagina can not be dilated due to the insufficient quantity of the injected liquid.

Drawings

FIG. 1 is an isometric view of a trigger in a gun body I in an extreme actuated position, a trigger in a gun body II in a reset position, and a plunger advanced into a syringe in an empty position according to an embodiment of the present invention;

FIG. 2 is an isometric view of the embodiment of the invention shown in FIG. 1 with the hidden housing I, the trigger in the body I in an extreme actuated position, the trigger in the body II in a reset position, and the plunger advanced into the syringe in an empty position;

FIG. 3 is an isometric view of the embodiment of FIG. 1 with the concealed gun housing III, the trigger in the gun body I in an extreme actuated position, the trigger in the gun body II in a reset position, and the plunger advanced into the syringe in an empty position;

FIG. 4 is an isometric view of the embodiment of the invention shown in FIG. 1 with the gun housing I hidden, the trigger in the gun body I in a reset condition, the trigger in the gun body II in a fully actuated condition, and the plunger retracted until the volume of fluid in the syringe has increased to a maximum volume;

FIG. 5 is an isometric view of the embodiment of FIG. 1 with the concealed gun housing III, the trigger in the gun body I in a reset condition, the trigger in the gun body II in an extreme actuated condition, and the plunger retracted to a maximum volume of fluid in the syringe;

FIG. 6 is an isometric view of the gun body of the embodiment of FIG. 1 of the present invention;

fig. 7 is an isometric view of the gun body of the embodiment of fig. 1 of the present invention in another orientation.

Detailed Description

1. The injection syringe comprises an injection syringe 2, a plunger 3, a plunger rod 4, a conical tube 5, a gun shell I6, a gun shell II 7, a support plate I8, a support plate II 9, a sleeve I10, a sleeve II 11, a pin shaft I12, a gun shell III 13, a gun shell IV 14, a pin shaft II 15, a trigger 16, a spring 17, a clamping sleeve 18, a boosting sleeve 19, a boosting rod 20, a shifting fork 21, a chain piece 22, a pin shaft III 23, a trigger shaft 24, a chain pin 25, a pin shaft IV 26, a shifting fork shaft 27, a pin shaft V28, a clamp 29 and a transmission plate.

In the embodiment shown in fig. 1-7: the injection tube 1 is in a transparent state, one end of the injection tube is closed, the outer circles of the two ends of the injection tube are provided with convex shoulders, and the two sides of the outer cylindrical surface of the injection tube 1 are provided with 0 line of scale marks positioned at the closed end along the length direction of the injection tube 1; a section of conical tube 4 extends outwards from the end part of the closed end of the injection tube 1, the conical tube 4 is positioned on the symmetrical surface of the scale marks at the two sides, the outer diameter of one end, close to the injection tube 1, of the conical tube 4 is large, the outer diameter of one end, far away from the injection tube 1, of the conical tube 4 is small, and the axis of the conical tube 4 is parallel to the axis of the injection tube 1; the outer diameter of a plunger 2 made of medical rubber is larger than the inner diameter of an injection tube 1, the difference value between the outer diameter of the plunger 2 and the inner diameter of the injection tube 1 is equal to 0.2mm-0.5mm, one end of a plunger rod 3 is provided with the plunger 2, and the end provided with the plunger 2 is inserted into the injection tube 1 from the opening end of the injection tube 1. The inner cavities of a gun shell I5 and a gun shell II 6 of the gun body I are hollow and in a 'thin shell' shape or a 'pistol' shape, and the whole gun shell I5 and the whole gun shell II 6 are divided into a gun body at the middle part, a gun barrel at the front part, a tail part far away from the rear upper part of the gun barrel and a gun handle positioned below; a bearing plate I7 is arranged in the inner cavity of the joint of the gun barrel and the gun body, a bearing plate II 8 is arranged in the inner cavity of the joint of the tail part and the gun body, round holes are formed in the bearing plate I7 and the bearing plate II 8, and the 2 round holes are coaxial; a sleeve I9 is arranged between the support plate I7 and the foremost end of the inner cavity of the gun barrel, a sleeve II 10 is arranged between the support plate II 8 and the rearmost end of the inner cavity of the tail part, and the axes of the sleeve I9 and the sleeve II 10 are coaxial with the common axis of the round holes on the support plate I7 and the support plate II 8; the outermost ends of the tail parts of the gun shell I5 and the gun shell II 6 are provided with round holes, the centers of the round holes are positioned on the axis of the sleeve II 10, the diameters of the round holes are equal to the inner diameter of the sleeve II 10, 1 pin shaft I11 extends inwards from the inner surfaces of the gun body parts of the gun shell I5 and the gun shell II 6, and 2 pin shafts I11 are coaxial; the middle part of the upper part of the gun body I is provided with an arc groove which is smaller than a semicircle, the radius of the arc groove is equal to one half of the outer diameter of the injection tube 1, the length of the arc groove is smaller than the total length from the front end of the gun barrel to the tail part of the gun shell, and the axis of the arc groove is parallel to the common axis of the sleeve I9 and the sleeve II 10. The gun shell II 6 is provided with a rectangular groove with a long edge parallel to the gun barrel, the symmetrical surface of the rectangular groove in the width direction coincides with a plane perpendicular to the left and right symmetrical surfaces of the gun body I and made through the axis of the sleeve I9, and the width of the rectangular groove is equal to the distance between the inner surfaces of the gun shell I5 and the gun shell II 6 which are symmetrical. The inner cavities of a gun shell III 12 and a gun shell IV 13 of the gun body II are hollow and in a shape of a thin shell and a gun handle, the whole gun shell III 12 and the whole gun shell IV 13 are divided into a gun body positioned above and a gun handle positioned below, the uppermost plane of the gun body part far away from the gun handle is in an open shape, and the inner surfaces of the gun body parts of the gun shell III 12 and the gun shell IV 13 respectively extend inwards to form 1 pin shaft II 14; the gun body II is fixed on the outer surface of the gun shell II 6, the uppermost opening of the gun body part of the gun body II is aligned to the rectangular groove on the gun shell II 6, the symmetry plane of the gun body II is coincided with a plane perpendicular to the symmetry plane of the gun body I through the axis of the sleeve I9, and the inclination direction of the tail end of the gun handle, far away from the gun body part, of the gun body II and the tail end of the gun handle, far away from the gun body part, of the gun body I in the axis direction of the sleeve I9 is opposite to the inclination direction of the gun body part. The trigger 15 of the boosting mechanism is in a diamond shape, and two side surfaces of the extended long diamond corner, which are vertical to the plane direction of the diamond shape, are in concave and convex arc shapes respectively; round holes with axes vertical to the diamond plane are arranged in the middle of the trigger 15 and at the diamond corners extending out of the opposite angles of the longer diamond corners, the middle of the trigger 15 is close to one end of the longer diamond corners and one side of the convex cambered surface close to the longer diamond corners extends out of 1 pin shaft III 22 to two sides along the direction vertical to the diamond plane, 2 pin shafts III 22 are coaxial, and the axes of the pin shafts III 22 are parallel to the axis of the round hole in the middle of the trigger 15; the trigger 15 is arranged in the middle of the trigger shaft 23 through a circular hole in the middle, a chain pin 24 is arranged in another circular hole of the trigger 15, two ends of the 1 trigger shaft 23 are respectively supported at the gun body parts of the gun shell I5 and the gun shell II 6 close to the gun barrel, and when one end of the trigger 15 extending out of the longer water caltrop faces the gun handle, the concave cambered surface of the trigger 15 extending out of the longer water caltrop faces one side of the gun barrel; two ends of another 1 trigger shaft 23 are respectively supported at the gun body far away from the gun barrel of the gun body I of the gun shell III 12 and the gun shell IV 13, and when one end of the trigger 15 extending out of the longer water caltrop faces the gun handle, the concave cambered surface of the trigger 15 extending out of the longer water caltrop faces back to one side of the gun barrel of the gun body I. The spring 16 is a torsion spring and is provided with 2 left-handed and right-handed symmetric springs, spring wires at two ends of 4 springs 16 respectively extend out of 1 section of straight line section along the radial direction of the spring 16, the tail ends of the straight line sections are respectively provided with a winding lug, the winding lugs at one end of each 1 left-handed and right-handed symmetric springs 16 are respectively sleeved and hung on pin shafts I11 arranged on the inner surfaces of a gun shell I5 and a gun shell II 6, the winding lugs at the other end of each 1 left-handed and right-handed symmetric spring 16 are respectively sleeved and hung on pin shafts II 14 arranged on the inner surfaces of a gun shell III 12 and a gun shell IV 13, and the winding lugs at the other end of each 1 pair of left-handed and right-handed symmetric springs 16 are respectively sleeved and hung on pin shafts III 22 arranged on two side surfaces of a trigger 15 in the gun body II. A convex shoulder is arranged on the excircle of one end of the cylindrical clamping sleeve 17, an external conical pipe section is arranged on the other end of the cylindrical clamping sleeve 17, the large end of the external conical pipe section is far away from the cylindrical pipe section of the clamping sleeve 17, the diameter of the small end of the external conical pipe section is equal to the external diameter of the cylindrical pipe section of the clamping sleeve 17, and 8 grooves are uniformly cut in the clamping sleeve 17 along the circumferential direction of the clamping sleeve 17; the two sides of the middle part of the excircle of the boosting sleeve 18 which is in a circular tube shape and has the inner diameter equal to the outer diameter of the cylindrical pipe section of the clamping sleeve 17 symmetrically extend outwards to form 1 pin shaft IV 25 respectively, and the 2 pin shafts IV 25 are coaxial; the push-aid rod 19 is inserted into the sleeve II 10 from the tail part of the gun body I, 2 clamping sleeves 17 are sleeved at the extending end penetrating through the support plate II 8, the end, with the groove, of one clamping sleeve 17 of 1 piece close to the support plate II 8 faces one side of the gun barrel, and the end, with the groove, of the other clamping sleeve 17 of 1 piece close to the support plate I7 faces away from one side of the gun barrel; the outer circles of the 2 clamping sleeves 17 are all sleeved with the boosting sleeves 18, and the extension ends of the boosting rods 19 penetrating through the 2 clamping sleeves 17 and the boosting sleeves 18 are inserted into the sleeve I9; one end of the shifting fork 20 in a rectangular flat plate shape is provided with a U-shaped groove, the symmetrical plane of the U-shaped groove is superposed with the symmetrical plane of the width direction of the rectangular plate surface of the shifting fork 20, the other end and the middle part of the shifting fork 20 are provided with round holes, and the axes of the 2 round holes are positioned on the symmetrical plane of the width direction of the rectangular plate surface of the shifting fork 20; the 2 shifting forks 20 are respectively fixed at two ends of a shifting fork shaft 26 through round holes at one ends, the axes of the round holes in the middle parts of the 2 shifting forks 20 are coaxial, and the symmetrical surfaces of the U-shaped grooves at one ends of the 2 shifting forks 20 are superposed; the assembled combination of the shifting fork 20 and the shifting fork shaft 26 is respectively supported at the positions, close to the tail, of gun bodies of a gun shell I5 and a gun shell II 6 of a gun body I through the extending ends of the two ends of the shifting fork shaft 26 after penetrating through the shifting fork 20, and 2 pin shafts IV 25 extending from the outer circle of a boosting sleeve 18 close to a supporting plate II 8 are respectively positioned in U-shaped grooves of the 2 shifting forks 20; one end of each of the 2 pieces of chain sheets 21 is hinged in a round hole in the middle of the 2 pieces of shifting fork 20 through a pin shaft V27, and the other end of each of the 2 pieces of chain sheets 21 is hinged at two ends of a chain pin 24 arranged on a trigger 15 in the gun body I; the assembled other 1 shifting fork 20 and shifting fork shaft 26 assembly is respectively supported on the gun body of the gun shell III 12 and the gun shell IV 13 of the gun body II close to the sleeve I9 of the gun body I through the extending ends of the two ends of the shifting fork shaft 26 after penetrating through the shifting fork 20, and 2 pin shafts IV 25 extending from the outer circle of the boosting sleeve 18 close to the supporting plate I7 are respectively positioned in the U-shaped grooves of the 2 shifting forks 20; one end of each 2-piece chain piece 21 is hinged in a round hole in the middle of each 2-piece shifting fork 20 through a pin shaft V27, and the other end of each 2-piece chain piece 21 is hinged at two ends of a chain pin 24 arranged on a trigger 15 in the gun body II. The two ends of the injection tube 1 are arranged in an arc groove above the gun body I through a clamp 28, one end of the injection tube extending out of the conical tube 4 faces the direction of the end of the gun barrel far away from the gun body, and the extending end of the plunger rod 3 inserted into the injection tube 1 is connected with the end, far away from the gun barrel, of the boosting rod 19 inserted into the gun body I through a transmission plate 29.

Claims (1)

1. A self-priming injection booster comprises an injector and a boosting gun, wherein the injector comprises an injection tube (1), a plunger (2) and a plunger rod (3), the injection tube (1) is in a transparent state, one end of the injection tube is closed, the excircles at the two ends of the injection tube are respectively provided with a convex shoulder, and the two sides of the outer cylindrical surface of the injection tube (1) are provided with scale marks with 0 line positioned at the closed end along the length direction of the injection tube (1); the end part of the closed end of the injection tube (1) extends outwards to form a section of conical tube (4), the conical tube (4) is positioned on the symmetrical surface of the scale marks on the two sides, the outer diameter of one end, close to the injection tube (1), of the conical tube (4) is large, the outer diameter of one end, far away from the injection tube (1), of the conical tube is small, and the axis of the conical tube (4) is parallel to the axis of the injection tube (1); the outer diameter of the plunger (2) is larger than the inner diameter of the injection tube (1), the difference value between the outer diameter of the plunger (2) and the inner diameter of the injection tube (1) is equal to 0.2mm-0.5mm, one end of the plunger rod (3) is provided with the plunger (2), and the end provided with the plunger (2) is inserted into the injection tube (1) from the opening end of the injection tube (1); the boosting gun comprises a gun body and a boosting mechanism, wherein the gun body comprises a gun body I and a gun body II, the gun body I comprises bilaterally symmetrical gun shells I (5) and II (6), a supporting plate and a sleeve, inner cavities of the gun shells I (5) and II (6) are hollow and in a thin shell shape or a pistol shape, and the whole gun shell I (5) and II (6) are divided into a gun body at the middle part, a gun barrel at the front part, a tail part far away from the rear upper part of the gun barrel and a gun handle positioned below; a bearing plate I (7) is arranged in the inner cavity of the joint of the gun barrel and the gun body, a bearing plate II (8) is arranged in the inner cavity of the joint of the tail part and the gun body, round holes are formed in the bearing plate I (7) and the bearing plate II (8), and 2 round holes are coaxial; a sleeve I (9) is arranged between the bearing plate I (7) and the foremost end of the inner cavity of the gun barrel, a sleeve II (10) is arranged between the bearing plate II (8) and the rearmost end of the inner cavity of the tail part, and the axes of the sleeve I (9) and the sleeve II (10) are coaxial with the common axis of the round holes on the bearing plate I (7) and the bearing plate II (8); the outermost ends of the tail parts of the gun shell I (5) and the gun shell II (6) are provided with round holes, the centers of the round holes are positioned on the axis of the sleeve II (10), the diameters of the round holes are equal to the inner diameter of the sleeve II (10), the inner surfaces of the gun body parts of the gun shell I (5) and the gun shell II (6) respectively extend 1 pin shaft I (11) inwards, and 2 pin shafts I (11) are coaxial; an arc groove smaller than a semicircle is arranged in the middle of the upper portion of the gun body I, the radius of the arc groove is equal to one half of the outer diameter of the injection tube (1), the length of the arc groove is smaller than the total length from the front end of the gun barrel to the tail portion of the gun shell, and the axis of the arc groove is parallel to the common axis of the sleeve I (9) and the sleeve II (10); the method is characterized in that: the gun shell II (6) is provided with a rectangular groove with the long side parallel to the gun barrel, the symmetrical surface of the rectangular groove in the width direction is superposed with a plane perpendicular to the symmetrical surface of the gun body I and made by the axis of the sleeve I (9), and the width of the rectangular groove is equal to the distance between the gun shell I (5) and the inner surface of the gun shell II (6) in bilateral symmetry; the gun body II comprises a gun shell III (12) and a gun shell IV (13) which are symmetrical, inner cavities of the gun shell III (12) and the gun shell IV (13) are in hollow thin shell shapes and gun handle shapes, the whole gun shell III (12) and the whole gun shell IV (13) are divided into a gun body positioned above and a gun handle positioned below, the uppermost plane of the gun body part far away from the gun handle is in an open shape, and the inner surfaces of the gun body parts of the gun shell III (12) and the gun shell IV (13) respectively extend inwards to form 1 pin shaft II (14); the uppermost opening of the gun body part of the gun body II is aligned with the rectangular groove on the gun shell II (6) and fixed on the outer surface of the gun shell II (6), the symmetry plane of the gun body II is positioned in a plane perpendicular to the symmetry plane of the gun body I through the axis of the sleeve I (9), and the inclination direction of the handle end of the gun body II, far away from the gun body part, and the inclination direction of the handle end of the gun body I, far away from the gun body part, relative to the gun body part are opposite along the axis direction of the sleeve I (9); the boosting mechanism comprises a trigger (15), a spring (16), a clamping sleeve (17), a boosting sleeve (18), a boosting rod (19), a shifting fork (20) and a chain sheet (21), the trigger (15) is in a diamond shape, and two side faces, perpendicular to the diamond plane direction, of a diamond corner with a longer extending length are in concave arc shapes and convex arc shapes respectively; a round hole with an axis vertical to the diamond plane is arranged in the middle of the trigger (15), round holes are also arranged at the diamond corners extending out of the opposite angles of the longer diamond corners, the axes of the 2 round holes are parallel, one side of the middle of the trigger (15), which is close to one end of the longer diamond corner and is close to the convex cambered surface of the longer diamond corner, extends 1 pin shaft III (22) to the two sides along the direction vertical to the diamond plane, the 2 pin shafts III (22) are coaxial, and the axis of the pin shaft III (22) is parallel to the axis of the round hole in the middle of the trigger (15); the trigger (15) is installed in the middle of a trigger shaft (23) through a round hole in the middle, a chain pin (24) is installed in another round hole of the trigger (15), two ends of 1 trigger shaft (23) are respectively supported at the gun body positions, close to the gun barrel, of a gun shell I (5) and a gun shell II (6), when one end, extending out of a longer water caltrop, of the trigger (15) faces towards the gun barrel, the concave arc surface, extending out of the longer water caltrop, of the trigger (15) faces towards one side of the gun barrel, two ends of the other 1 trigger shaft (23) are respectively supported at the gun body positions, far away from the gun barrel of the gun body I, of the gun shell III (12) and the gun shell IV (13), and when one end, extending out of the longer water caltrop, of the trigger (15) faces towards the gun barrel; the spring (16) is a torsion spring and is provided with 2 pieces of left-handed and right-handed symmetrical spring wires, spring wires at two ends of 4 pieces of spring (16) respectively extend out of 1 section of straight line section along the radial direction of the spring (16), the tail ends of the straight line sections are provided with a winding lug, the winding lugs at one end of each 1 piece of spring (16) which is symmetrical in the left-handed and right-handed directions are respectively sleeved on pin shafts I (11) arranged on the inner surfaces of a gun shell I (5) and a gun shell II (6), the winding lugs at the other end are respectively sleeved on pin shafts III (22) arranged on two side surfaces of a trigger (15) in the gun body I, the winding lugs at one end of the other 1 pair of spring (16) which are symmetrical in the left-handed and right-handed directions are respectively sleeved on pin shafts II (14) arranged on the inner surfaces of the gun shell III (12) and the gun shell IV (13), and the winding lugs at the other end are respectively sleeved; a convex shoulder is arranged on the excircle of one end of a cylindrical clamping sleeve (17), an outer conical pipe section is arranged on the other end of the cylindrical clamping sleeve, the large end of the outer conical pipe section is far away from the cylindrical pipe section of the clamping sleeve (17), the diameter of the small end of the outer conical pipe section is equal to the outer diameter of the cylindrical pipe section of the clamping sleeve (17), a plurality of grooves are uniformly cut in the clamping sleeve (17) along the circumferential direction of the clamping sleeve (17), 1 pin shaft IV (25) symmetrically extends outwards from two sides of the middle part of the excircle of a boosting sleeve (18) which is in a circular pipe shape and has the inner diameter equal to the outer diameter of the cylindrical pipe section of the clamping sleeve (17), and 2 pin shafts IV (; the push-aid rod (19) is inserted into the sleeve II (10) from the tail part of the gun body I, 2 clamping sleeves (17) are sleeved at the extending end penetrating through the support plate II (8), one end, with a groove, of each clamping sleeve (17) 1 piece close to the support plate II (8) faces one side of the gun barrel, and the other end, with a groove, of each clamping sleeve (17) 1 piece close to the support plate I (7) faces away from one side of the gun barrel; the outer circles of the 2 clamping sleeves (17) are all sleeved with the boosting sleeves (18), and the extension ends of the boosting rods (19) which penetrate through the 2 clamping sleeves (17) and the boosting sleeves (18) are inserted into the sleeve I (9); one end of a shifting fork (20) in a rectangular flat plate shape is provided with a U-shaped groove, the symmetrical surface of the U-shaped groove is superposed with the symmetrical surface of the rectangular plate surface of the shifting fork (20) in the width direction, the other end and the middle part of the shifting fork (20) are provided with round holes, the axes of the 2 round holes are positioned on the symmetrical surface of the rectangular plate surface of the shifting fork (20) in the width direction, 2 shifting forks (20) are respectively fixed at the two ends of a shifting fork shaft (26) through the round holes at one end, the axes of the round holes at the middle parts of the 2 shifting forks (20) are coaxial, and the symmetrical surfaces of the U-shaped grooves at one end of; the 1-piece assembly formed by assembling the shifting fork (20) and the shifting fork shaft (26) is respectively supported at the positions, close to the tail, of a gun shell I (5) of the gun body I and a gun body of a gun shell II (6) through the extending ends of the two ends of the shifting fork shaft (26) after penetrating through the shifting fork (20), and 2 pin shafts IV (25) extending from the outer circle of a boosting sleeve (18) close to the position of a supporting plate II (8) are respectively positioned in U-shaped grooves of the 2 shifting forks (20); one end of each of the 2 pieces of chain sheets (21) is hinged in a round hole in the middle of the 2 pieces of shifting forks (20) through a pin shaft V (27), and the other end of each of the 2 pieces of chain sheets (21) is hinged at two ends of a chain pin (24) arranged on a trigger (15) in the gun body I; the assembled assembly of another 1 shifting fork (20) and a shifting fork shaft (26) is respectively supported at the positions, close to a sleeve I (9) of the gun body I, of gun shells III (12) and IV (13) of the gun body II and gun bodies of the gun shells IV (13) through the extending ends of the two ends of the shifting fork shaft (26) after penetrating through the shifting fork (20), and 2 pin shafts IV (25) extending from the outer circles of the boosting sleeves (18) close to the supporting plate I (7) are respectively positioned in U-shaped grooves of the 2 shifting forks (20); one end of each of the 2 pieces of chain sheets (21) is hinged in a round hole in the middle of the 2 pieces of shifting forks (20) through a pin shaft V (27), and the other end of each of the 2 pieces of chain sheets (21) is hinged at two ends of a chain pin (24) arranged on a trigger (15) in the gun body II; the two ends of the injection tube (1) are mounted in an arc groove above the gun body I through a hoop (28), one end of the injection tube (1) extending out of the conical tube (4) faces the direction of the gun barrel away from one end of the gun body, and the extending end of the plunger rod (3) inserted into the injection tube (1) is connected with the end, away from the gun barrel, of the push-aid rod (19) inserted into the gun body I through a transmission plate (29).

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