Dispensing gun with adjustable thrust ratio

Abstract

The invention discloses a dispensing gun with an adjustable thrust ratio, and belongs to the technical field of dispensing guns. The glue dispensing gun comprises a main body and a wrench, the main body comprises a handheld part and a gun body part, and the wrench is rotationally connected with the handheld part through a pin; a glue outlet pushing mechanism is arranged in the gun body part, and a thrust ratio adjusting mechanism is arranged in the wrench; the thrust ratio adjusting mechanism comprises a switching knob, an adjusting rod and a prying point moving block which are connected in sequence, and the prying point moving block abuts against the glue outlet pushing mechanism; and the switching knob is rotated to drive the adjusting rod and the prying point moving block to perform reciprocating displacement relative to the glue discharging pushing mechanism. According to the glue dispensing gun, the thrust ratio adjusting mechanism is arranged in the wrench, the length of a force arm between the prying point and the rotating center can be changed, then the thrust ratio of the glue dispensing gun is adjusted, adjustment can be conducted according to the viscosity of glue in actual production, and therefore the requirements of different kinds of glue can be met, and stepless adjustment can be achieved within a certain range.

Description

Technical Field

[0001] The invention belongs to the technical field of glue dispensing guns, and in particular relates to a glue dispensing gun with adjustable thrust ratio. Background Art

[0002] A glue dispensing gun is a handheld tool for spraying glue. A manual glue dispensing gun sprays the glue in the hose onto the surface to be sealed or bonded at a certain flow rate and speed by turning the handle. It is suitable for use by non-professionals at home.

[0003] The manual glue gun applies pressure to the hose through the compression mechanism. The bottom of the hose is compressed and moves into the hose, which can squeeze the glue out of the hose to achieve the purpose of glue dispensing. The thrust ratio of the glue gun is an important indicator for evaluating the performance of the glue gun. The thrust ratio refers to the range of thrust that the glue gun can generate under specific conditions to measure whether the thrust of the glue gun can meet the work requirements. A glue gun with a suitable thrust ratio can generate a stable and appropriate thrust during the spraying process to accurately control the amount and position of glue spraying, which is conducive to improving production efficiency and product quality.

[0004] However, most of the current dispensing guns have a fixed thrust ratio, and the thrust ratio cannot be adjusted. For example, the utility model patent "Handheld dispensing gun for inductor coil production" with publication number CN215964561U discloses a dispensing gun, which extrude the glue inside the material tube by setting a fixed-length slide rail in conjunction with a slider to ensure that the amount of glue extruded each time is the same. When operating, you only need to press the extrusion switch and the control button, which is easy to operate and control. Another example is the utility model patent "A hot melt glue dispensing gun that is easy to position" with publication number CN216678913U. By setting a positioning tube, a sealing ring, a positioning box and a roller, the positioning tube and the rubber tube can be locked and limited after sliding, which is convenient for positioning and dispensing at different positions, and avoiding the influence of the dispensing accuracy on the dispensing position error.

[0005] Neither of the above two patents mentions the thrust ratio of the dispensing gun. In actual use, the dispensing gun cannot be adjusted according to actual application requirements to meet the use requirements of glues with different viscosities, and the scope of application is relatively narrow. Summary of the invention

[0006] The purpose of the present invention is to provide a dispensing gun with adjustable thrust ratio to solve the technical problems mentioned in the above background technology.

[0007] In order to achieve the above-mentioned object, the present invention discloses a dispensing gun with adjustable thrust ratio, comprising a main body and a wrench, wherein the main body comprises a hand-held part and a gun body, and the wrench is rotatably connected to the hand-held part through a pin; a glue dispensing pushing mechanism is provided in the gun body, and a thrust ratio adjusting mechanism is provided in the wrench; The thrust ratio adjustment mechanism includes a conversion knob, an adjustment rod and a pry point moving block connected in sequence, and the pry point moving block abuts against the glue discharge pushing mechanism; when the conversion knob is rotated, the conversion knob drives the adjustment rod and the pry point moving block to move back and forth relative to the glue discharge pushing mechanism.

[0008] When the contact point positions between the pry point moving block and the glue dispensing pushing mechanism are different, the glue dispensing gun can generate different thrust ratios, thereby adjusting the thrust ratio of the glue dispensing gun.

[0009] Furthermore, the glue discharging pushing mechanism includes a compression rod, a return spring, and a movable plate; a first through hole is provided in the gun body, the compression rod is inserted and installed in the first through hole, and both ends of the compression rod extend out of the outside of the gun body; the return spring and the movable plate are sequentially sleeved on the outside of the compression rod in the gun body; A second through hole is provided in the wrench, the adjusting rod is inserted and installed in the second through hole, one end of the adjusting rod is threadedly connected to the conversion knob, and the other end is fixedly connected to the pry point moving block; The return spring, the moving plate and the pry point moving block are in contact with each other in sequence. One end of the return spring away from the moving plate is in contact with the interior of the gun body. One end of the pry point moving block away from the moving plate is in contact with the interior of the wrench.

[0010] Furthermore, the thrust ratio adjustment mechanism also includes a pre-stress spring, which is sleeved on the outside of the adjustment rod. A rib plate is provided inside the wrench below the pry point moving block. One end of the pre-stress spring abuts against the pry point moving block, and the other end abuts against the rib plate.

[0011] Furthermore, a hose limiting sleeve is installed on the gun body at one end close to the wrench, and the hose limiting sleeve is threadedly connected to the first through hole through a hollow bolt, and one end of the compression rod passes through the hollow bolt and is located inside the hose limiting sleeve.

[0012] Furthermore, a first mounting groove is provided in the gun body, the return spring and the movable plate are located in the first mounting groove in sequence, the bottom of the hollow bolt is flush with a side wall of the first mounting groove, one end of the return spring abuts against the bottom of the hollow bolt, and the other end abuts against the movable plate.

[0013] Furthermore, a second mounting groove is provided at one end of the wrench away from the conversion knob, the first through hole, the first mounting groove, the second mounting groove and the second through hole are connected to each other, and the pry point moving block is located in the second mounting groove.

[0014] Furthermore, a compression disc is installed on one end of the compression rod located inside the hose limiting sleeve, and a return handle is installed on the other end.

[0015] Furthermore, a waist-shaped hole is provided on the pry point moving block, and a first pin penetrates through the waist-shaped hole from the outside of the wrench to install the wrench on the hand-held part.

[0016] The first pin is the rotation center of the wrench when it rotates relative to the handheld part, and the contact point between the pry point moving block and the moving plate is the pry point. When the wrench is pressed, the pry point moving block uses the pry point as the force point to squeeze the moving plate to drive the return spring and the compression rod forward to achieve glue dispensing.

[0017] Turning the conversion knob can change the distance between the pry point and the first pin, that is, change the length of the force arm, thereby achieving thrust ratio adjustment of the dispensing gun.

[0018] Furthermore, the adjusting rod and the pry point moving block are fixedly connected via a second pin.

[0019] Furthermore, the wrench is rotationally connected to the hand-held part via a return torsion spring, and the return torsion spring is fixedly installed in the wrench via a third pin. One end of the return torsion spring abuts against the wrench, and the other end abuts against the hand-held part.

[0020] Compared with the prior art, the dispensing gun with adjustable thrust ratio of the present invention has the following advantages: The glue gun of the present invention can change the length of the force arm between the prying point and the rotation center by setting a thrust ratio adjustment mechanism in the wrench, thereby adjusting the thrust ratio of the glue gun. In actual production, the glue gun can be adjusted according to the viscosity of the glue to meet the requirements of different glues, and can achieve stepless adjustment within a certain range. At the same time, the glue gun of the present invention has a simple structure, convenient assembly, low production cost, and convenient operation process, and is easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 : Schematic diagram of the first three-dimensional structure of the dispensing gun with adjustable thrust ratio.

[0022] Figure 2 : Schematic diagram of the second three-dimensional structure of the dispensing gun with adjustable thrust ratio.

[0023] Figure 3 : Schematic diagram of the internal structure of a dispensing gun with adjustable thrust ratio.

[0024] Figure 4 : Schematic diagram of the cross-sectional structure of a dispensing gun with adjustable thrust ratio.

[0025] Figure 5 : Schematic diagram of the local explosion structure of a dispensing gun with adjustable thrust ratio.

[0026] Among them, 1. main body; 2. wrench; 3. hand grip; 4. gun body; 5. return torsion spring; 6. first pin; 7. second pin; 8. third pin; 21. conversion knob; 22. adjustment rod; 23. pry point moving block; 24. second through hole; 25. blind hole; 26. preload spring; 27. rib plate; 28. second mounting groove; 29. ​​waist-shaped hole; 41. compression rod; 42. return spring; 43. moving plate; 44. first through hole; 45. hose limit sleeve; 46. hollow bolt; 47. first mounting groove; 48. compression disk; 49. return handle. DETAILED DESCRIPTION

[0027] The dispensing gun with adjustable thrust ratio of the present invention is described in detail below in conjunction with the accompanying drawings.

[0028] like Figure 1-5 As shown, a schematic diagram of the structure of a dispensing gun with adjustable thrust ratio is given.

[0029] A glue dispensing gun with adjustable thrust ratio includes a main body 1 and a wrench 2. The main body 1 includes a hand-held portion 3 and a gun body 4. The wrench 2 is rotationally connected to the hand-held portion 3 via a return torsion spring 5. A glue dispensing push mechanism is provided in the gun body 4. A thrust ratio adjustment mechanism is provided in the wrench 2, and the glue dispensing push mechanism abuts against the thrust ratio adjustment mechanism.

[0030] Specifically, the glue discharging pushing mechanism includes a compression rod 41 , a return spring 42 and a moving plate 43 .

[0031] A first through hole 44 is provided in the gun body 4, and a compression rod 41 is inserted and installed in the first through hole 44. Both ends of the compression rod 41 extend out of the gun body 4, and a return spring 42 and a moving plate 43 are sequentially sleeved on the outside of the compression rod 41 in the gun body 4.

[0032] On the gun body 4, a hose limiting sleeve 45 is installed at one end near the wrench 2. The hose limiting sleeve 45 is threadedly connected to the first through hole 44 through a hollow bolt 46. The hollow area of ​​the hollow bolt 46 is connected to the first through hole 44. One end of the compression rod 41 passes through the hollow area of ​​the hollow bolt 46 and is located inside the hose limiting sleeve 45.

[0033] A first mounting groove 47 is provided in the gun body 4, and the return spring 42 and the movable plate 43 are sequentially located in the first mounting groove 47, the bottom of the hollow bolt 46 is flush with the side wall of the first mounting groove 47, one end of the return spring 42 abuts against the bottom of the hollow bolt 46, and the other end abuts against the movable plate 43.

[0034] A compression plate 48 is installed on one end of the compression rod 41 inside the hose limiting sleeve 45 , and a return handle 49 is installed on the other end.

[0035] Specifically, the thrust ratio adjustment mechanism includes a conversion knob 21, an adjustment rod 22, and a pry point moving block 23. A second through hole 24 is provided in the wrench 2. The adjustment rod 22 is inserted and installed in the second through hole 24. One end of the adjustment rod 22 is threadedly connected to the conversion knob 21, and the other end is fixedly connected to the pry point moving block 23. A blind hole 25 is provided on the pry point moving block 23, and the other end of the adjustment rod 22 is inserted into the blind hole 25 through interference fit to achieve fixed connection.

[0036] In addition, the thrust ratio adjustment mechanism also includes a pre-stress spring 26, which is sleeved on the outside of the adjustment rod 22. A rib plate 27 is provided inside the wrench 2 below the pry point moving block 23. One end of the pre-stress spring 26 abuts against the pry point moving block 23, and the other end abuts against the rib plate 27.

[0037] A second mounting groove 28 is provided at one end of the wrench 2 away from the conversion knob 21 , wherein the first through hole 44 , the first mounting groove 47 , the second mounting groove 28 and the second through hole 24 are connected to each other, and the pry point moving block 23 is located in the second mounting groove 28 .

[0038] A waist-shaped hole 29 is provided on the pry point moving block 23, and the first pin 6 passes through the waist-shaped hole 29 from the outside of the wrench 2 to install the wrench 2 on the hand-held part 3; in order to improve the connection stability, the adjusting rod 22 and the pry point moving block 23 are also fixedly connected by a second pin 7, and the return torsion spring 5 is fixedly installed in the wrench 2 by a third pin 8, one end of the return torsion spring 5 abuts against the wrench 2, and the other end abuts against the hand-held part 3.

[0039] When the glue dispensing gun of the present invention is not in use, due to the elastic effect of the return spring 42, the elastic force of the return spring 42 will push the movable plate 43 to move back to its original position. When the rubber hose needs to be installed, the return handle 49 is pulled backward, and the return spring 42 is not under force and is in a natural state. The return handle 49 drives the compression rod 41 to be pulled backward, and the rubber hose can be placed in the rubber hose limiting sleeve 45, and the top of the rubber hose is located at the front end of the rubber hose limiting sleeve 45 to facilitate glue discharge, and the bottom is abutted against the compression disk 48.

[0040] When glue dispensing is required, the wrench 2 is pressed to move closer to the hand-held part 3, and the prying point moving block 23 squeezes the moving plate 43 and the return spring 42, thereby driving the compression rod 41 to move forward, pushing the compression disk 48 to squeeze the bottom of the rubber hose, squeezing out the glue in the rubber hose, and achieving glue dispensing. After the glue dispensing is completed, under the action of the return torsion spring 5, the wrench 2 returns to its original position, the compression disk 48 stops moving forward, and the rubber hose stops dispensing glue.

[0041] The working process of the dispensing gun with adjustable thrust ratio of the present invention is as follows: When a larger thrust ratio is needed, the conversion knob 21 is rotated clockwise, and the conversion knob 21 drives the adjustment rod 22 and the prying point moving block 23 to move downward. When reaching the lowest point, the distance between the contact point (i.e., the prying point) between the prying point moving block 23 and the moving plate 43 and the first pin 6 (i.e., the force arm) is the shortest, and the thrust ratio is maximum at this time. When the wrench 2 is pulled, the prying point moving block 23 squeezes the moving plate 43 and the return spring 42 to drive the compression rod 41 forward, which can compress the bottom of the hose placed in the hose limiting sleeve 45 and move forward to squeeze out the glue in the hose.

[0042] When a smaller thrust ratio is needed, the conversion knob 21 is rotated counterclockwise, and the conversion knob 21 drives the adjustment rod 22 and the prying point moving block 23 to move upward. When reaching the highest point, the distance (i.e., the force arm) between the contact point (i.e., the prying point) between the prying point moving block 23 and the moving plate 43 and the first pin 6 (i.e., the rotation center) is the longest, and the thrust ratio is the smallest at this time. Pull the wrench 2, and the prying point moving block 23 squeezes the moving plate 43 and the return spring 42 to drive the compression rod 41 forward, which can compress the bottom of the hose placed in the hose limiting sleeve 45 and move forward to squeeze out the glue in the hose.

[0043] Since the conversion knob 21 and the adjustment rod 22 are threadedly connected, the conversion knob 21 can be rotated to the middle position during actual use to adjust the thrust ratio between the maximum value and the minimum value, thereby achieving stepless adjustment and being suitable for more applications.

[0044] The above are only preferred embodiments of the present invention and are not intended to limit the invention. Any modifications, equivalent substitutions, improvements, etc. made within the design concept of the present invention should be included in the protection scope of the present invention.

Claims

1. A dispensing gun with adjustable thrust ratio, comprising a main body and a wrench, characterized in that: The main body comprises a hand-held part and a gun body, and the wrench is rotatably connected to the hand-held part through a pin; a glue discharging pushing mechanism is provided in the gun body, and a thrust ratio adjusting mechanism is provided in the wrench; The thrust ratio adjustment mechanism includes a conversion knob, an adjustment rod and a pry point moving block connected in sequence, and the pry point moving block abuts against the glue discharge pushing mechanism; when the conversion knob is rotated, the conversion knob drives the adjustment rod and the pry point moving block to move back and forth relative to the glue discharge pushing mechanism.

2. The dispensing gun with adjustable thrust ratio as claimed in claim 1, characterized in that: The glue discharging pushing mechanism includes a compression rod, a return spring, and a moving plate; a first through hole is provided in the gun body, the compression rod is inserted and installed in the first through hole, and both ends of the compression rod extend out of the outside of the gun body; the return spring and the moving plate are sequentially sleeved on the outside of the compression rod in the gun body; A second through hole is provided in the wrench, the adjusting rod is inserted and installed in the second through hole, one end of the adjusting rod is threadedly connected to the conversion knob, and the other end is fixedly connected to the pry point moving block; The return spring, the moving plate and the pry point moving block are in contact with each other in sequence. One end of the return spring away from the moving plate is in contact with the interior of the gun body. One end of the pry point moving block away from the moving plate is in contact with the interior of the wrench.

3. The dispensing gun with adjustable thrust ratio as claimed in claim 2, characterized in that: The thrust ratio adjustment mechanism also includes a pre-stress spring, which is sleeved on the outside of the adjustment rod. A rib plate is provided inside the wrench below the pry point moving block. One end of the pre-stress spring abuts against the pry point moving block, and the other end abuts against the rib plate.

4. The dispensing gun with adjustable thrust ratio as claimed in claim 2, characterized in that: A hose limiting sleeve is installed on the gun body at one end close to the wrench. The hose limiting sleeve is threadedly connected to the first through hole through a hollow bolt. One end of the compression rod passes through the hollow bolt and is located inside the hose limiting sleeve.

5. The dispensing gun with adjustable thrust ratio as claimed in claim 4, characterized in that: A first mounting groove is provided in the gun body, the return spring and the movable plate are located in the first mounting groove in sequence, the bottom of the hollow bolt is flush with a side wall of the first mounting groove, one end of the return spring abuts against the bottom of the hollow bolt, and the other end abuts against the movable plate.

6. The dispensing gun with adjustable thrust ratio as claimed in claim 5, characterized in that: A second mounting groove is provided at one end of the wrench away from the conversion knob, the first through hole, the first mounting groove, the second mounting groove and the second through hole are connected to each other, and the pry point moving block is located in the second mounting groove.

7. The dispensing gun with adjustable thrust ratio as claimed in claim 4, characterized in that: A compression disc is installed on one end of the compression rod located inside the hose limiting sleeve, and a return handle is installed on the other end.

8. The dispensing gun with adjustable thrust ratio as claimed in claim 3, characterized in that: A waist-shaped hole is arranged on the pry point moving block, and a first pin penetrates through the waist-shaped hole from the outside of the wrench to install the wrench on the hand-held part.

9. The dispensing gun with adjustable thrust ratio as claimed in claim 8, characterized in that: The adjusting rod and the pry point moving block are fixedly connected via a second pin.

10. The dispensing gun with adjustable thrust ratio as claimed in claim 9, characterized in that: The wrench is rotationally connected to the hand-held part through a return torsion spring, and the return torsion spring is fixedly installed in the wrench through a third pin. One end of the return torsion spring abuts against the wrench, and the other end abuts against the hand-held part.

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