Liquid food booster

Abstract

The utility model discloses a liquid food booster which comprises a liquid food barrel (2), a piston assembly (3), a push-pull rod (4), a front handle (5), a rear handle (10), a sliding block guide assembly (6) and a sliding block (8), the rear end of the liquid food barrel (2) is connected with the front end of the front handle (5), the guide assembly (6) is fixedly connected to the rear end of the front handle (5), and the upper ends of the front handle (5) and the rear handle (10) are hinged through a rotating shaft (7). A first return spring (9) and a guide rod (5.2) are arranged between the front handle (5) and the rear handle (10), and the first return spring (9) is arranged on the guide rod (5.2) in a penetrating manner; the sliding block (8) is arranged on the rear handle (10), the piston assembly (3) is arranged at the front end of the push-pull rod (4), the sliding block (8) is provided with a driving part and can be operated by one hand, the feeding amount of the liquid food is controlled in a progressive multi-gear mode, the situation that a large dose of liquid food is pushed at a time is prevented, and pain of a patient can be relieved.

Description

Technical Field

[0001] The utility model relates to an apparatus for feeding patients, in particular to a booster for feeding patients liquid food. The booster can also be used for feeding patients medicine, and can also be called a push-in type drug delivery device. Background Art

[0002] Due to various medical conditions, some people are unable to take care of themselves. They are unable to chew and must be fed directly into the stomach via a tube. The food is in a liquid or semi-liquid state. Traditionally, caregivers use a manual syringe to push food into the stomach. This often causes discomfort and additional pain to the patient due to pushing too much food at once or pushing it too quickly. Most caregivers are elderly and frail. Manual syringes apply force directly to the push rod, and the liquid tube can only hold a limited amount of food at a time. Repeated feedings are necessary, which can cause fatigue for the caregiver. Furthermore, manual syringes require two hands to operate: one hand holds the liquid tube and the other holds the push rod, leaving one hand unavailable for other tasks. Manual syringes typically use a scale to determine the speed of feeding. It is often difficult for caregivers to accurately stop at the scale, which can result in pushing too much food too quickly or too quickly, causing additional pain for the patient.

[0003] The prior art also discloses further optimized manual liquid food boosters, such as the Chinese utility model patent with application number CN202121497417.5 and patent name "A manual liquid food booster". The manual liquid food booster disclosed in this utility model patent includes a liquid food storage tube 1, a rear shell 2, a push rod 3 and a fixed handle 4. A connector 12 through which the push rod 3 passes is fixedly provided inside the rear shell 2, and a return plate 10 through which the push rod 3 passes is provided at the lower right side of the connector 12. A return knob 7 with a groove is provided at the lower right side of the return plate 10. The bottom end of the return plate 10 is installed in the groove of the return knob 7, and the two ends of the return knob 7 are rotatably connected to the rear shell 2. The working principle of the liquid food booster is as follows: when using the manual liquid food booster to eat, hold the fixed handle 4 and the movable handle 5 in one hand and squeeze them, the bottom of the movable handle 5 approaches the fixed handle 4, and the rotation of the movable handle 5 causes the pushing screw 11 to move to the left, and the leftward movement of the pushing screw 11 drives the lower and middle part of the pushing piece 8 to move to the left. When the pushing piece 8 is in a non-vertical position, the pushing piece 8 and the push rod 3 generate contact friction, and the push rod 3 moves to the left under the action of the friction force; when the movable handle 5 approaches the fixed handle, stop squeezing and pressing, and the pushing piece 8 moves to the right under the action of the second spring 16. The movement of the pushing piece 8 drives the pushing screw 11 to move to the right, and then the movable handle 5 returns to its initial position; when eating is needed again, cyclically squeeze and press the fixed handle 4 and the movable handle 5 to achieve continuous eating.

[0004] However, existing manual liquid food boosters have at least the following defects: (1) pushing too much food at a time or pushing too fast may cause discomfort to the patient and bring additional pain to the patient; (2) applying force directly to the push rod increases the operating intensity of the caregiver; (3) requiring two-handed operation, and one hand cannot be freed to do other things; (4) it is usually difficult to stop accurately at the scale position, which may cause the food to be pushed too fast or too much at a time, causing additional pain to the patient; (5) the liquid food storage tube is not marked with a gas balance hole, and there will usually be excessive push and pull resistance during use; (6) the distance of each push is limited and fixed; (7) it is too tight or too loose when pushing, which is unreliable; (8) there is no gear to choose from, and the amount of push at a time cannot be adjusted according to the patient's response, resulting in poor flexibility. Utility Model Content

[0005] In view of the technical problems raised in the background art, the present invention provides a liquid food booster to solve at least one of the technical problems mentioned in the background art.

[0006] The present utility model provides a liquid food booster, comprising a liquid food cylinder 2, a piston assembly 3, a push-pull rod 4, a front handle 5, a rear handle 10, a slider guide assembly 6, and a sliding block 8, wherein the rear end of the liquid food cylinder 2 is connected to the front end of the front handle 5, the guide assembly 6 is fixedly connected to the rear end of the front handle 5, the front handle 5 and the rear handle 10 are hingedly connected at the upper end by a rotating shaft 7, a first return spring 9 and a guide rod 5.2 are provided between the front handle 5 and the rear handle 10, and the first return spring 9 is passed through the guide rod 5.2; the sliding block 8 is provided on the rear handle 10, the piston assembly 3 is provided at the front end of the push-pull rod 4, and the sliding block 8 is provided with a driving component, which is used to drive the push-pull rod 4 to advance forward.

[0007] In a further preferred embodiment, a tooth groove 4.1 is provided on the push-pull rod 4, and the driving component includes a paddle 8.1 arranged on the sliding block 8, and a snap-fit ​​tooth 8.1.1 is provided at the front end of the paddle 8.1. The snap-fit ​​tooth 8.1.1 is used to engage with the tooth groove 4.1 on the pull rod 4 to push the pull rod 4 forward.

[0008] In a further preferred embodiment, the sliding guide assembly 6 includes a guide block 6.5 and a sliding length rotary ruler 6.2 that can rotate axially along the guide block 6.5. The sliding length rotary ruler 6.2 is embedded in the guide block 6.5 and has a clearance fit. The sliding length rotary ruler 6.2 is provided with a plurality of steps 6.2.1 of different lengths facing the paddle 8.1 along the circumferential direction. The steps 6.2.1 are used to limit the position of the paddle 8.1 pushing the pull rod 4 forward, thereby controlling the liquid food propulsion volume to 1ml-5ml.

[0009] In a further preferred embodiment, the sliding length rotary ruler 6.2 is provided with a plurality of first grooves on the circumference corresponding to the number of steps, the guide block 6.5 is provided with a second groove, the second return spring 6.4 is provided in the second groove, and a round ball 6.3 is provided on the outside of the second return spring 6.4 to push the top, and the round ball 6.3 can be sunk into the first groove under the action of the elastic force of the second return spring 6.4.

[0010] In a further preferred embodiment, the sliding block 8 includes a sliding block body 8.4, the paddle 8.1 is embedded in the fourth groove of the sliding block body 8.4, the rear end of the paddle 8.1 is hinged to the sliding block body 8.4 by a rotating pin 8.2, and the fourth return spring 8.3 is embedded in the fourth groove of the sliding block body 8.4 and pushes the paddle 8.1 upward so that the engaging tooth 8.1.1 is engaged in the tooth groove 4.1 of the push-pull rod 4.

[0011] In a further preferred embodiment, the sliding block body 8.4 is provided with a through hole 8.5 and a sliding groove 8.6, the guide rod is fixed to the front handle 5 and extends backward to pass through the through hole 8.5, the sliding groove 8.6 extends in the up and down directions, and the inner side of the rear handle 10 is provided with a left-right symmetrical boss 10.1, and the boss 10.1 is embedded in the sliding groove 8.6.

[0012] A further preferred embodiment further includes a backstop 6.7, which includes a backstop block 6.7.2 and a backstop plate 6.7.1. The backstop plate 6.7.1 is fixed to the lower part of the backstop block 6.7.2, the backstop block 6.7.2 is arranged in the guide groove of the guide block 6.5, the third return spring 6.6 is arranged in the third groove of the backstop block 6.7.2, and is pushed against the bottom surface of the guide groove. The backstop plate 6.7.1 is provided with an inner hole through which the push-pull rod 4 passes, and the inner hole of the backstop plate 6.7.1 is provided with a locking tooth 6.7.3 that is engaged with the tooth groove of the push-pull rod 4.

[0013] In a further preferred embodiment, the sliding block body 8.4 is provided with a rear boss, and a circular hole is provided at the lower portion of the retaining plate 6.7.1, and the rear boss can be inserted into the circular hole to lock the retaining plate 6.7.1.

[0014] In a further preferred embodiment, the front handle 5 is provided with an air pressure balance hole 5.1 communicating with the external atmosphere.

[0015] In a further preferred embodiment, the piston assembly 3 includes a piston 3.2 and a piston sealing ring 3.1 embedded in a groove on the outer periphery of the piston 3.2.

[0016] The liquid food booster protected by the patent of this utility model can be operated with one hand, so that the other hand can complete other operations. The lever principle is used to reduce the force applied by the operator on the handle; the liquid food is pushed in a gradual manner to prevent the pushing of a large dose of liquid food at one time, thereby reducing the patient's pain; the utility model can achieve quantitative feeding by adjusting the single feeding gear, and increase or decrease the single feeding flow rate by observing the patient's reaction; the air pressure inside and outside the liquid food cylinder is balanced, reducing the resistance caused by the compression of the air in the liquid food cylinder near the handle during withdrawal, and the air pull caused by the thinning of the air in the liquid food cylinder near the handle during forward advancement. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a front view of a liquid food booster protected by the present utility model;

[0018] Figure 2 This is a cross-sectional view of a liquid food booster protected by the present utility model;

[0019] Figure 3 This is a right side view of a liquid food booster protected by the present utility model;

[0020] Figure 4 for Figure 3 A partial enlarged view of the middle A;

[0021] Figure 5 for Figure 1 Cross-sectional view at the middle BB.

[0022] In the figure: 1-connecting nozzle assembly, 1.1-connecting nozzle, 1.2-connecting nozzle sealing ring, 2-liquid feeding tube, 3-piston assembly, 3.1-piston sealing ring, 3.2-piston, 4-push-pull rod, 4.1-tooth groove, 5-front handle, 5.1-air pressure balance hole, 5.2-guide rod, 6-slider guide assembly, 6.1-nut, 6.2-sliding length rotary ruler, 6.2.1-step, 6.3-ball, 6.4-second return spring, 6.5-guide Toward block, 6.6-third return spring, 6.7-retraction device, 6.7.1-retraction plate, 6.7.2-retraction block, 6.7.3-grip, 7-rotation shaft, 8-sliding block, 8.1-paddle, 8.1.1-clamping tooth, 8.2-rotation pin, 8.3-fourth return spring, 8.4-sliding block body, 8.5-through hole, 8.6-sliding groove, 9-first return spring, 10-rear handle, 10.1-boss, 11-pull back handle. DETAILED DESCRIPTION

[0023] The features and exemplary embodiments of various aspects of the present utility model will be described in detail below. In order to make the purpose, technical solutions and advantages of the present utility model more clear, the present utility model will be further described in detail below in conjunction with the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only configured to explain the present utility model and are not configured to limit the present utility model. For those skilled in the art, the present utility model can be implemented without the need for some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present utility model by illustrating examples of the present utility model.

[0024] The technical solution protected by the utility model patent is further described in detail with reference to the following drawings and embodiments.

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0026] like Figures 1 to 5 As shown, the main components of the liquid food booster of the present invention include: a connecting nozzle assembly 1, a liquid food tube 2, a piston assembly 3, a push-pull rod 4, a front handle 5, a slider guide assembly 6, a rotating shaft 7, a sliding block 8, a first return spring 9, a rear handle 10, and a pull-back handle 11.

[0027] Specifically, the above-mentioned connecting nozzle assembly 1 includes a connecting nozzle 1.1 and a connecting nozzle sealing ring 1.2. The connecting nozzle 1.1 is provided with a stepped plug-in nozzle, which can be connected to a feeding hose (not shown) by plugging. The connecting nozzle 1.1 is connected to the opening at one end of the liquid food cylinder 2 by threading, and the connecting nozzle sealing ring 1.2 is pressed against the liquid food cylinder 2 to prevent leakage. The liquid food cylinder 2 is open at the other end, and the front handle 5 is connected to the other end of the liquid food cylinder 2 by threading. The lower part of the front handle 5 is a gripping portion, and the upper part is provided with a rearward extending lug. The lower part of the rear handle 10 is a gripping portion, and the upper part is hingedly connected to the rearward extending lug of the front handle 5 via a rotating shaft 7. The rear handle 10 and the front handle 5 can rotate around the rotating shaft 7. The tension of the first return spring 9 maintains a certain opening angle between the rear handle 10 and the front handle 5. Furthermore, the front handle 5 is provided with a guide rod 5.2 extending backward, and the guide rod 5.2 passes through the through hole 8.5 of the sliding block 8 on the rear handle 10. The first return spring 9 is passed through the guide rod 5.2, and then the first return spring 9 pushes between the front handle 5 and the rear handle 10, so that the two are opened to a certain angle under the elastic force of the first return spring 9.

[0028] Furthermore, the slider guide assembly 6 includes a connecting nut 6.1, a sliding length rotary ruler 6.2, a ball 6.3, a second return spring 6.4, a guide block 6.5, a third return spring 6.6, and a backstop 6.7.

[0029] Specifically, the threaded step at the front of the guide block 6.5 passes through the mounting hole of the front handle 5, and the connecting nut 6.1 is connected to the threaded step of the guide block 6.5 and locked with the front handle 5.

[0030] Furthermore, the piston assembly 3 is composed as follows:

[0031] The piston assembly 3 includes a piston 3.2 and a piston seal 3.1 disposed on the outer periphery of the piston 3.2 or embedded in a groove on the outer periphery of the piston 3.2. Preferably, the seal 3.1 is embedded in the groove of the piston 3.2 and has an interference fit with the inner wall of the liquid food cylinder 2. The piston seal 3.1 and the liquid food cylinder 2 are tightly coupled to form two left and right cavities.

[0032] The piston 3.2 of the piston assembly 3 is connected to one end of the push-pull rod 4. Preferably, the connection method can be a threaded connection or one end of the push-pull rod 4 is embedded in the piston 3.2. The tail of the push-pull rod 4 extends out of the liquid food barrel 2 and the slider guide assembly 6, and is connected to the pull-back handle 11 by threading.

[0033] The push-pull rod 4 and the sliding block 8 are connected to each other via a paddle 8.1. Specifically, the push-pull rod 4 has a tooth groove 4.1 at its lower end along its length, and a latching tooth 8.1.1 is provided at the front end of the paddle 8.1. Under the spring force of the fourth return spring 8.3, the latching tooth 8.1.1 on the paddle 8.1 is embedded in the tooth groove 4.1 of the push-pull rod 4.

[0034] Furthermore, the slider guide assembly 6 is composed as follows:

[0035] The sliding length rotary ruler 6.2 is embedded in the guide block 6.5 and is connected to the guide block 6.5 with a clearance fit. The sliding length rotary ruler 6.2 can rotate axially around the guide block 6.5. The sliding length rotary ruler 6.2 has a number of first grooves evenly distributed around its circumference, with the number of first grooves corresponding to the number of gears for the amount of liquid feed to be fed at a time. The cylindrical boss of the sliding length rotary ruler 6.2 is provided with multiple steps 6.2.1 of varying lengths, corresponding to the number of gears. A second return spring 6.4 is positioned within the second groove of the guide block 6.5 and applies a certain outward elastic force to the ball 6.3, causing it to push against the first groove. When the sliding length rotary ruler 6.2 rotates, the ball 6.3, under the action of the second return spring 6.4, sinks into the first groove of the sliding length rotary ruler 6.2, thereby achieving scale positioning. Due to the moderate elastic force of the second return spring 6.4, the sliding length rotary ruler 6.2 can still rotate in this state, thus achieving the next scale positioning. The slider guide assembly 6 is provided with a quantitative mechanism sliding length rotary ruler 6.2. When pushing food, the pushing flow rate can be set in advance as needed. Preferably, a single press of the handle can push 1-5 ml, to prevent excessive food from entering the stomach directly, causing discomfort or choking in the patient. The booster protected by the utility model is also used for drug administration. The dosage can be set in advance to avoid overdosing due to excessive pressure on the handle.

[0036] Furthermore, the backstop 6.7 includes a backstop block 6.7.2 located at the top and a backstop plate 6.7.1 located at the bottom. Preferably, the backstop plate 6.7.1 is embedded in the backstop block 6.7.2, which is disposed in a guide groove formed at the tail end of the guide block 6.5. The backstop plate 6.7.1 extends into a slot extending downward from the tail end of the guide block 6.5. The backstop plate 6.7.1 has an inner hole through which the push-pull rod 4 passes, and a latching tooth 6.7.3 is formed on the lower edge of the inner hole. A third return spring 6.6 is disposed in a third groove of the backstop block 6.7.2 and pushes against the bottom surface of the guide groove. Under the action of the spring force of the third return spring 6.6, the latching tooth 6.7.3 of the backstop plate 6.7.1 is engaged with the tooth groove 4.1 of the push-pull rod 4, preventing the push-pull rod 4 from retreating. Since the teeth 6.7.3 of the anti-retraction piece 6.7.1 and the tooth groove 4.1 of the push-pull rod 4 have the same tooth shape and the same direction, when the push-pull rod 4 is pushed forward, the anti-retraction piece 6.7.1 has no effect on the movement of the push-pull rod 4.

[0037] like Figure 4As shown in the enlarged partial view (A), the rear handle 10 includes bilaterally symmetrical bosses 10.1. Bosses 10.1 fit within the vertically extending sliding grooves 8.6 of the sliding block 8. The sliding grooves 8.6 extend vertically, allowing bosses 10.1 to slide within the grooves. The sliding block 8 includes a through-hole into which the guide rods 5.2 of the front handle 5 fit. The sliding block 8 can slide on the guide rods 5.2 of the front handle 5. Alternatively, the guide rods 5.2 can be independent slides bolted to the front handle 5.

[0038] Preferably, the front handle 5 is provided with an air pressure balancing hole 5.1, which is used to connect the cavity of the liquid food cylinder 2 on the right side of the piston assembly 3 with the external atmosphere to balance the air pressure in the cavity of the liquid food cylinder 2 on both sides of the piston assembly 3, which can greatly reduce the squeezing force of the handle when injecting liquid food.

[0039] Furthermore, the sliding block 8 is composed as follows:

[0040] The paddle 8.1 is inserted into the fourth groove of the slider body 8.4 with a clearance fit. The rear end of the paddle 8.1 is hinged to the slider body 8.4 via a rotating pin 8.2, thereby restricting the paddle 8.1 to rotation. A fourth return spring 8.3 is embedded in the fourth groove of the slider body 8.4. When not under pressure, the fourth return spring 8.3 pushes the paddle 8.1 upward to support it, positioning the paddle 8.1 at a predetermined angle relative to the horizontal plane and engaging the engaging tooth 8.1.1 at the front end of the paddle 8.1 with the tooth groove 4.1 of the push-pull rod 4. When the rear end of the paddle 8.1 protruding from the surface of the sliding block body 8.4 is squeezed, for example, by pressing the rear end of the paddle 8.1 with the thumb, the paddle 8.1 rotates around the rotating pin 8.2, and the bottom surface of the paddle 8.1 compresses the fourth return spring 8.3 downward. When the paddle 8.1 rotates to a certain angle, the engaging tooth 8.1.1 at the front end of the paddle 8.1 can disengage from the tooth groove 4.1 of the push-pull rod 4.

[0041] Method of using the liquid food booster protected by this utility model patent:

[0042] 1. Push the piston forward:

[0043] Grip the front handle 5 with your fingers and press the rear handle 10 with your palm. Rear handle 10 rotates around axis 7 within the limits of rotation axis 7. The boss of rear handle 10 pushes the slide block 8 forward. At this time, the engaging teeth 8.1.1 at the front end of the paddle 8.1 engage the tooth groove 4.1 of the push-pull rod 4, thereby driving the push-pull rod 4 forward. The piston assembly 3 is fixed in front of the push-pull rod 4. The piston assembly 3 and the push-pull rod 4 work together to push the food out of the liquid food cylinder 2 and into the feeding hose plugged into the connecting nozzle assembly 1. External air can enter the cavity to the right of the piston assembly 3 through the air pressure balance hole 5.1. Limited by the sliding length rotary ruler 6.2, the paddle 8.1 can only move forward to the corresponding length step position of the boss at the end of the sliding length rotary ruler 6.2. When the rear handle 10 pushes forward, the first return spring 9 is compressed, accumulating spring force. When the rear handle 10 is not subjected to an applied force, the rebound force of the first return spring 9 pushes the rear handle 10 backward, and the boss 10.1 of the rear handle 10 drives the sliding block 8 backward. The tooth profile of the engaging teeth 8.1.1 at the front end of the paddle 8.1 is in the same direction as the tooth profile of the push-pull rod 4. Therefore, when the sliding block 8 moves backward, the inclined surface of the tooth profile of the push-pull rod 4 presses the engaging teeth 8.1.1 at the front end of the paddle 8.1 downward, allowing the engaging teeth 8.1.1 at the front end of the paddle 8.1 to pass over the tooth tips of the push-pull rod 4 and disengage the tooth grooves 4.1 of the push-pull rod 4, allowing the sliding block 8 to move backward flexibly.

[0044] 2. Pulling the piston back:

[0045] Under the elastic force of the third return spring 6.6, the backstop 6.7 is pushed upward, and the teeth 6.7.3 of the backstop plate 6.7.1 are stuck in the tooth groove 4.1 of the push-pull rod 4. Since the tooth profile of the teeth 6.7.3 of the backstop plate 6.7.1 is in the same direction as the tooth profile of the push-pull rod 4, the push-pull rod 4 can only be pushed forward, preventing the push-pull rod 4 from moving backward. To pull the push-pull rod 4 and the piston assembly 3 backward, the backstop block 6.7.2 of the backstop 6.7 is pressed downward, causing the teeth 6.7.3 of the backstop plate 6.7.1 to disengage the tooth groove 4.1 of the push-pull rod 4. Pulling the rear handle 10 backward drives the sliding block 8 backward. The rear boss of the sliding block 8 inserts into the circular hole of the backstop plate 6.7.1, locking the backstop plate 6.7.1 and preventing it from rebounding upward. The rear end of the paddle 8.1 is squeezed, and the engaging teeth 8.1.1 at the front end of the paddle 8.1 disengage from the tooth groove 4.1 of the push-pull rod 4. By holding the pull-back handle 11 and pulling the push-pull rod 4 backward, the piston 3.2 can be easily pulled backward. Since the air in the right cavity of the piston 3.2 can be discharged through the air pressure balance hole 5.1, the air pressure on both sides of the piston assembly 3 is basically the same, and the force required to pull back the handle 11 is significantly reduced.

[0046] The above describes the implementation methods of the present invention. However, the present invention is not limited to the above implementation methods. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A liquid food booster, characterized in that: The invention comprises a liquid food cylinder (2), a piston assembly (3), a push-pull rod (4), a front handle (5), a rear handle (10), a slider guide assembly (6), and a sliding block (8), wherein the rear end of the liquid food cylinder (2) is connected to the front end of the front handle (5), the guide assembly (6) is fixedly connected to the rear end of the front handle (5), the front handle (5) and the rear handle (10) are hingedly connected at the upper end through a rotating shaft (7), a first return spring (9) and a guide rod (5.2) are provided between the front handle (5) and the rear handle (10), and the first return spring (9) is passed through the guide rod (5.2); the sliding block (8) is provided on the rear handle (10), the piston assembly (3) is provided at the front end of the push-pull rod (4), and the sliding block (8) is provided with a driving component, which is used to drive the push-pull rod (4) to advance forward.

2. The liquid food booster according to claim 1, characterized in that: The push-pull rod (4) is provided with a tooth groove (4.1), and the driving component includes a paddle (8.1) provided on the sliding block (8), and a latching tooth ( 8.1.1), the engaging teeth (8.1.1) are used to engage with the tooth grooves (4.1) on the pull rod (4) to push the pull rod (4) forward.

3. The liquid food booster according to claim 2, characterized in that: The sliding guide assembly (6) comprises a guide block (6.5) and a sliding length rotary ruler (6.2) rotatable along the axial direction of the guide block (6.5). The sliding length rotary ruler (6.2) is embedded in the guide block (6.5) and is clearance-fitted. The sliding length rotary ruler (6.2) is provided with a plurality of steps (6.2.1) of different lengths facing the paddle (8.1) along the circumferential direction. The steps (6.2.1) are used to limit the position of the paddle (8.1) pushing the pull rod (4) forward, thereby controlling the liquid food propulsion volume to be 1 ml to 5 ml.

4. The liquid food booster according to claim 3, characterized in that: The sliding length rotary ruler (6.2) is provided with a plurality of first grooves corresponding to the number of steps on its circumference, the guide block (6.5) is provided with a second groove, a second return spring (6.4) is provided in the second groove, and a round ball (6.3) is provided outside the second return spring (6.4) to push the top, and the round ball (6.3) can sink into the first groove under the elastic force of the second return spring (6.4).

5. The liquid food booster according to any one of claims 2 to 4, characterized in that: The sliding block (8) comprises a sliding block body (8.4), the paddle (8.1) is embedded in a fourth groove of the sliding block body (8.4), the rear end of the paddle (8.1) is hinged to the sliding block body (8.4) via a rotating pin (8.2), and a fourth return spring (8.3) is embedded in the fourth groove of the sliding block body (8.4) and pushes the paddle (8.1) upward to allow the engaging tooth (8.1.1) to engage in the tooth groove (4.1) of the push-pull rod (4).

6. The liquid food booster according to claim 5, characterized in that: The sliding block body (8.4) is provided with a through hole (8.5) and a sliding groove (8.6); the guide rod is fixed to the front handle (5) and extends rearward to penetrate the through hole (8.5); the sliding groove (8.6) extends in the up-down direction; the inner side of the rear handle (10) is provided with a left-right symmetrical boss (10.1), and the boss (10.1) is embedded in the sliding groove (8.6).

7. The liquid food booster according to claim 6, characterized in that: The invention also includes a backstop (6.7), wherein the backstop (6.7) includes a backstop block (6.7.2) and a backstop sheet (6.7.1). The backstop sheet (6.7.1) is fixed to the lower part of the backstop block (6.7.2). The backstop block (6.7.2) is arranged in the guide groove of the guide block (6.5). The third return spring (6.6) is arranged in the third groove of the backstop block (6.7.2) and pushes against the bottom surface of the guide groove. The backstop sheet (6.7.1) is provided with an inner hole through which the push-pull rod (4) passes. The inner hole of the backstop sheet (6.7.1) is provided with a clamping tooth (6.7.3) clamped with the tooth groove of the push-pull rod (4).

8. The liquid food booster according to claim 7, characterized in that: The sliding block body (8.4) is provided with a rear boss, and the lower part of the anti-retraction plate (6.7.1) is provided with a circular hole, and the rear boss can be inserted into the circular hole to lock the anti-retraction plate (6.7.1).

9. The liquid food booster according to claim 1, characterized in that: The front handle (5) is provided with an air pressure balance hole (5.1) communicating with the external atmosphere.

10. The liquid food booster according to claim 1, characterized in that: The piston assembly (3) comprises a piston (3.2) and a piston sealing ring (3.1) embedded in a groove on the outer periphery of the piston (3.2).

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