Explosion-proof charging gun

Abstract

The gun head structure of an explosion-proof charging gun provided by the present invention includes a gun barrel, a valve stem, a valve block, a connecting seat and a drainage seat, wherein the valve stem is located in the gun barrel and is coaxially arranged with the gun barrel; the bottom of the valve stem is fixedly connected to the top of the connecting seat, and the connecting seat and the drainage seat clamp and connect the valve block; wherein the size of the connecting seat is smaller than the inner diameter of the gun barrel, the valve block is a truncated cone shape with a small upper portion and a large lower portion, the upper size is smaller than the inner diameter of the gun barrel, the lower size is larger than the inner diameter of the gun barrel, and an outer convex arc surface structure that increases gradually from top to bottom is provided at the lower portion of the valve block. The gun head structure of the explosion-proof charging gun provided by the present invention can form a tight pressing force through the outer convex arc surface structure of the valve block and the inner convex arc surface structure of the gun barrel; a cross support structure is formed by two sliders, thereby ensuring the coaxiality of the valve block and the muzzle, and avoiding friction between the slider and the inner wall of the gun barrel.

Description

Technical Field

[0001] The invention relates to the field of filling machines, in particular to an explosion-proof filling gun. Background Art

[0002] The filling gun is indispensable for industrial filling equipment. A driving rod in the filling gun drives the valve stem to control the opening and closing of the valve head at the bottom.

[0003] The charging gun structure disclosed in patent application No. 202310903479.9 uses a corrugated sealing tube, the lower end of which is sealed to the outer wall of the gun barrel, and the upper end is sealed to the main driving rod, and the lower end is fixed, and the upper end moves up and down with the main driving rod. The pressure change of its pressure compensation chamber is due to the continuous filling or discharge of nitrogen.

[0004] Since nitrogen needs to be filled between the sealing tube and the pressure compensation chamber, and nitrogen requires external nitrogen filling equipment, the charging gun drive control process requires auxiliary nitrogen adjustment, making the equipment complicated and bulky, and increasing the chance of maintenance. Summary of the invention

[0005] The technical problem to be solved by the embodiments of the present invention is to provide an explosion-proof charging gun to solve the problem of automatically adjusting the pressure balance in the corrugated sealing tube.

[0006] An explosion-proof charging gun, comprising a main driving rod, a secondary driving rod, a valve stem, a main driving pipe, a bellows, a fixing seat, a balancing air pipe, a sealing sleeve and a sealing ring, wherein the main driving rod is located in the main driving pipe, the lower end of the main driving rod is connected to the secondary driving rod, the bellows is sleeved on the main driving rod, and the lower end of the bellows is clamped and sealed by the main driving rod and the secondary driving rod; the upper end of the bellows is clamped and sealed between the main driving pipe and the fixing seat; an annular mounting cavity with an L-shaped cross section is formed between the fixing seat, the upper end of the bellows, and the main driving rod, and the sealing ring and the sealing sleeve are installed in the annular mounting cavity; wherein the annular mounting cavity comprises a cylindrical cavity close to the outer wall of the main driving rod and an annular cavity perpendicular to the outer wall of the main driving rod, and the sealing ring is pushed into the cylindrical cavity from the bottom by the sealing sleeve; The outer ring of the sealing sleeve is provided with a first annular step surface and a second annular step surface from bottom to top, wherein the outer diameter of the first annular step surface is larger than the outer diameter of the second annular step surface, the second annular step surface is located in the cylindrical cavity, and the second annular step surface squeezes the sealing ring to form a constant pressure cavity; an annular cavity is formed between the first annular step surface and the fixed seat as an air guide cavity, and the balance air pipe is connected with the air guide cavity through the channel on the side wall of the fixed seat; radially arranged air guide holes are provided on the circumference of the first annular step surface, and the air guide holes are connected to the surface of the main driving rod, and a pressure stabilizing cavity is formed by the bellows, the main driving rod, and the sealing sleeve; high-pressure gas is introduced into the balance air pipe, which is connected with the air guide cavity through the channel of the fixed seat, and the gas is further squeezed into the constant pressure cavity and the pressure stabilizing cavity through the air guide holes.

[0007] In the inner wall of the sealing sleeve, the area above the air guide hole is the first area, and the area below the air guide hole is the second area. The contact length between the first area and the surface of the main driving rod is smaller than the contact length between the second area and the surface of the main driving rod, so that the gas in the air guide hole is preferentially introduced into the pressure stabilizing chamber through the second area.

[0008] There are a plurality of air guide holes, which are evenly distributed on the circumference of the first annular step surface.

[0009] An annular bevel is provided on the inner wall of the second annular step surface to increase the volume of the constant pressure cavity.

[0010] The clamping force between the sealing sleeve and the main driving rod is smaller than the clamping force between the sealing ring and the main driving rod;

[0011] The cross section of the sealing sleeve is an n-shaped structure; a clamping ring is arranged inside the sealing ring, and the clamping ring clamps the main driving rod.

[0012] The cylindrical cavity is cylindrical; the annular cavity is annular, the inner diameter of the annular cavity is the same as the inner diameter of the cylindrical cavity, and the outer diameter of the annular cavity is larger than the outer diameter of the cylindrical cavity.

[0013] At least one annular groove is provided in the second region, and the cross section of the groove is triangular.

[0014] When the number of the grooves is more than two, at least one groove is connected to the air guide hole to form an annular air guide structure connected to the air guide hole and the air guide cavity.

[0015] The lower end of the main driving rod is connected to the screw hole at the top end of the auxiliary driving rod through a stud to clamp the bottom of the bellows;

[0016] Correspondingly, the middle part of the bellows is a corrugated structure, the top end is a planar circular ring structure, the bottom end shrinks inwards, and finally forms a disc structure with holes.

[0017] A one-way valve is provided at the end of the balancing air pipe so that gas can only enter but cannot overflow from the end of the balancing air pipe; a quick-connect structure is also provided on the outside of the one-way valve to connect with an external inflation device.

[0018] The explosion-proof charging gun provided by the present invention forms a constant pressure chamber between the sealing sleeve and the sealing ring, and forms a pressure-stabilizing chamber between the sealing sleeve and the bellows, that is, the driving main rod, through the structural design of the sealing sleeve. The balance air pipe enters the air guide chamber through the channel, and then presses the gas into the constant pressure chamber and the pressure-stabilizing chamber through the air guide hole. When the driving process of the main driving rod causes the volume of the pressure-stabilizing chamber to change and the pressure to change, the sealing sleeve seals the pressure-stabilizing chamber. When the pressure is too high, the gas can be backfilled into the balance air pipe through the air guide pipe of the sealing sleeve without entering the constant pressure chamber. Therefore, during the telescopic movement of the main driving rod, the pressure in the constant pressure chamber can be kept unchanged, and only the pressure in the pressure-stabilizing chamber changes, thereby avoiding leakage of material in the material gun. Since the bottom of the bellows is clamped and sealed by the main driving rod and the auxiliary driving rod, and the top is compressed and sealed by the main driving pipe and the fixed seat, the bellows can isolate the material, and it will not enter the pressure-stabilizing chamber through the bellows, let alone the constant pressure chamber, thereby preventing leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional structural diagram of the explosion-proof charging gun described in an embodiment of the present invention.

[0020] Figure 2 for Figure 1 Schematic diagram of the local enlarged structure in.

[0021] Figure 3 For Figure 2 For comparison, a schematic diagram of the comparative structure after omitting the sealing sleeve.

[0022] Figure 4 It is a three-dimensional diagram of the sealing sleeve according to the embodiment of the present invention.

[0023] Figure 5 It is a side view of the sealing sleeve according to the embodiment of the present invention.

[0024] Figure 6 It is a cross-sectional view of the sealing sleeve according to the embodiment of the present invention.

[0025] Figure 7 It is a three-dimensional cross-sectional view of the explosion-proof charging gun described in an embodiment of the present invention.

[0026] In the figure:

[0027] 1. Main driving rod; 2. Auxiliary driving rod; 3. Valve stem; 4. Main driving pipe; 5. Bellows; 5a. Pressure stabilizing chamber; 6. Fixed seat; 6a. Channel; 7. Balance air pipe; 8. Sealing sleeve; 8a. First annular step surface; 8b. Second annular step surface; 8c. Air guide hole; 81. First area; 82. Second area; 82a. Groove; 83. Bevel; 9. Sealing ring; 9a. Constant pressure chamber; 11. Annular mounting chamber; 11a. Cylindrical chamber; 11b. Annular chamber; 12. Air guide chamber. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0029] like Figure 1-7As shown, the present invention provides an explosion-proof charging gun, comprising a main driving rod 1, a secondary driving rod 2, a valve stem 3, a main driving pipe 4, a bellows 5, a fixing seat 6, a balancing air pipe 7, a sealing sleeve 8 and a sealing ring 9. The main driving rod 1 is located in the main driving pipe 4, the lower end of the main driving rod 1 is connected to the secondary driving rod 2, the bellows 5 is sleeved on the main driving rod 1, and the lower end of the bellows 5 is clamped and sealed by the main driving rod 1 and the secondary driving rod 2; the upper end of the bellows 5 is clamped The seal is formed between the main drive tube 4 and the fixing seat 6; an annular installation cavity 11 with an L-shaped cross section is formed between the fixing seat 6 and the upper end of the bellows 5 and the main drive rod 1, and the sealing ring 9 and the sealing sleeve 8 are installed in the annular installation cavity 11; wherein the annular installation cavity 11 includes a cylindrical cavity 11a close to the outer wall of the main drive rod 1 and an annular cavity 11b perpendicular to the outer wall of the main drive rod 1, and the sealing ring 9 is pushed into the cylindrical cavity 11a from the bottom by the sealing sleeve 8; The outer ring of the sealing sleeve 8 is provided with a first annular step surface 8a and a second annular step surface 8b from bottom to top, wherein the outer diameter of the first annular step surface 8a is greater than the outer diameter of the second annular step surface 8b, the second annular step surface 8b is located in the cylindrical cavity, and the second annular step surface 8b squeezes the sealing ring 99 to form a constant pressure cavity 9a; an annular cavity is formed between the first annular step surface 8a and the fixed seat 6 as an air guide cavity 12, and the balancing air pipe 7 is connected with the air guide cavity 12 through the channel 6a on the side wall of the fixed seat 6; radially arranged air guide holes 8c are provided on the circumference of the first annular step surface 8a, and the air guide holes 8c are connected to the surface of the main driving rod 1, and a pressure stabilizing cavity 5a is formed between the bellows 5 and the main driving rod 1, and the sealing sleeve 8; the balancing air pipe 7 is introduced with high-pressure gas, which is connected with the air guide cavity 12 through the channel 6a of the fixed seat 6, and further squeezes the gas into the constant pressure cavity 9a and the pressure stabilizing cavity 5a through the air guide holes 8c.

[0030] During operation, the present invention firstly connects to the quick connector of the balance air pipe 7 through an external air pump or other air supply device, and then inflates the bellows through the balance air pipe. The specific air path process is as follows: the gas first passes through the channel 6a on the fixed seat 6 and enters the air guide cavity 12, and the gas is formed into a ring path through the air guide cavity 12; then enters the surface of the main driving rod 1 through the air guide hole 8c connected to the air guide cavity 12; then, through the action of high pressure, it is squeezed upward into the constant pressure cavity 9a and downward into the pressure stabilizing cavity 5a, respectively. Since the constant pressure cavity is restricted by the main driving rod 1 and the fixed seat 6 as a whole, the deformation of the sealing ring 9 in the constant pressure cavity is limited. When the pressure in the constant pressure cavity 9a reaches a certain value, it will no longer rise, and force more gas to enter the pressure stabilizing cavity downward, prompting the bellows of the pressure stabilizing cavity to be pressurized and expanded. When the pressure in the pressure stabilizing cavity 5a reaches the set value, the inflation is stopped, and the external air supply device is removed from the balance air pipe 7.

[0031] The pressure value in the constant pressure chamber 9a of the present invention can be basically kept constant, because its own volume is basically unchanged, and basically no gas exchange is carried out with the outside; while the pressure value in the pressure stabilizing chamber 5a is caused by the expansion and contraction of the bellows 5 as the main driving rod 1 is driven. Since the bellows of the pressure stabilizing chamber 5a are locked and sealed at the top and bottom, if the pressure value exceeds a certain range, it will be squeezed out into the groove 82a through the connecting surface between the sealing sleeve 8 and the main driving rod 1, and then enter the air guide chamber 12, the channel 6a and the balance air pipe 7 through the air guide hole 8c. Since a one-way valve is provided at the end of the balance air pipe 7, the one-way valve can only take in air but not discharge air, so the gas in the balance air pipe 7 will not leak; and in this process, the gas will not enter the constant pressure chamber, thereby ensuring that the pressure in the constant pressure chamber remains unchanged.

[0032] refer to Figure 6 In the inner wall of the sealing sleeve 8, the area above the air guide hole 8c is the first area 81, and the area below the air guide hole 8c is the second area 82. The contact length between the first area 81 and the surface of the main driving rod 1 is smaller than the contact length between the second area 82 and the surface of the main driving rod 1, so that the gas in the air guide hole 8c is preferentially introduced into the pressure stabilizing chamber through the second area 82.

[0033] There are a plurality of air guide holes 8c, which are evenly distributed on the circumference of the first annular step surface 8a.

[0034] An annular bevel is provided on the inner wall of the second annular step surface 8b to increase the volume of the constant pressure chamber.

[0035] The clamping force between the sealing sleeve 8 and the main driving rod 1 is smaller than the clamping force between the sealing ring 9 and the main driving rod 1;

[0036] The cross section of the sealing sleeve 8 is an n-shaped structure; a clamping ring is arranged inside the sealing ring 9, and the clamping ring clamps the main driving rod 1.

[0037] The cylindrical cavity 11a is cylindrical; the annular cavity 11b is annular, the inner diameter of the annular cavity 11b is the same as the inner diameter of the cylindrical cavity 11a, and the outer diameter of the annular cavity 11b is larger than the outer diameter of the cylindrical cavity 11a.

[0038] At least one annular groove 82a is disposed in the second region 82, and the cross section of the groove 82a is triangular.

[0039] When there are two or more grooves 82 a, at least one groove 82 a is connected to the air guide hole 8 c to form an annular air guide structure connected to the air guide hole 8 c and the air guide cavity 12 .

[0040] The lower end of the main driving rod 1 is connected to the screw hole at the top end of the auxiliary driving rod 2 through a stud to clamp the bottom of the bellows 5;

[0041] Correspondingly, the middle part of the bellows 5 is a corrugated structure, the top end is a planar circular ring structure, the bottom end shrinks inwards, and finally forms a disc structure with holes.

[0042] A one-way valve (not shown) is provided at the end of the balancing air pipe 7 so that gas can only enter but not overflow from the end of the balancing air pipe 7; a quick-connect structure is also provided on the outside of the one-way valve to connect with an external inflation device.

[0043] The explosion-proof charging gun provided by the present invention forms a constant pressure chamber between the sealing sleeve 8 and the sealing ring 9, and forms a pressure stabilizing chamber between the sealing sleeve 8 and the bellows 5, i.e., the driving main rod. The balance air pipe 7 enters the air guide chamber 12 through the channel, and then presses the gas into the constant pressure chamber and the pressure stabilizing chamber through the air guide hole 8c. When the driving process of the main driving rod 1 causes the volume of the pressure stabilizing chamber to change and the pressure changes, the sealing sleeve 8 seals the pressure stabilizing chamber. When the pressure is too high, the gas can be refilled to the balance air chamber through the air guide pipe of the sealing sleeve 8. tube 7, and will not enter the constant pressure chamber; therefore, during the telescopic movement of the main driving rod 1, the pressure in the constant pressure chamber can be kept unchanged, and only the pressure in the pressure-stabilizing chamber changes, thereby avoiding leakage of material in the material gun; since the bottom of the bellows 5 is clamped and sealed by the main driving rod 1 and the auxiliary driving rod 2, and the top is compressed and sealed by the main driving tube 4 and the fixed seat 6, the bellows 5 can isolate the material, and it will not enter the pressure-stabilizing chamber through the bellows 5, let alone the constant pressure chamber, thereby preventing leakage.

[0044] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0045] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An explosion-proof charging gun, comprising a main drive rod, a secondary drive rod, a valve stem, a main drive pipe, a bellows, a fixing seat, a balance air pipe, a sealing sleeve and a sealing ring, characterized in that: The main driving rod is located in the main driving tube, the lower end of the main driving rod is connected to the auxiliary driving rod, the bellows is sleeved on the main driving rod, and the lower end of the bellows is clamped and sealed by the main driving rod and the auxiliary driving rod; the upper end of the bellows is clamped and sealed between the main driving tube and the fixed seat; an annular installation cavity with an L-shaped cross section is formed between the fixed seat, the upper end of the bellows, and the main driving rod, and the sealing ring and the sealing sleeve are installed in the annular installation cavity; wherein the annular installation cavity includes a cylindrical cavity close to the outer wall of the main driving rod and an annular cavity perpendicular to the outer wall of the main driving rod, and the sealing ring is pushed into the cylindrical cavity from the bottom by the sealing sleeve; the outer ring of the sealing sleeve is provided with a first annular step surface and a second annular step surface from bottom to top, wherein the outer diameter of the first annular step surface is greater than the outer diameter of the second annular step surface, the second annular step surface is located in the cylindrical cavity, and the second annular step surface squeezes the sealing ring to form a constant pressure cavity; An annular cavity is formed between the first annular step surface and the fixed seat as an air guide cavity, and the balance air pipe is connected with the air guide cavity through the channel on the side wall of the fixed seat; radially arranged air guide holes are provided on the circumference of the first annular step surface, and the air guide holes are connected to the surface of the main driving rod, and a pressure stabilizing cavity is formed between the bellows, the main driving rod, and the sealing sleeve; high-pressure gas is introduced into the balance air pipe, which is connected with the air guide cavity through the channel of the fixed seat, and the gas is further squeezed into the constant pressure cavity and the pressure stabilizing cavity through the air guide holes.

2. The explosion-proof charging gun according to claim 1, characterized in that: In the inner wall of the sealing sleeve, the area above the air guide hole is the first area, and the area below the air guide hole is the second area. The contact length between the first area and the surface of the main driving rod is smaller than the contact length between the second area and the surface of the main driving rod, so that the gas in the air guide hole is preferentially introduced into the pressure stabilizing chamber through the second area.

3. The explosion-proof charging gun according to claim 1, characterized in that: There are a plurality of air guide holes, which are evenly distributed on the circumference of the first annular step surface.

4. The explosion-proof charging gun according to claim 1, characterized in that: An annular bevel is provided on the inner wall of the second annular step surface to increase the volume of the constant pressure cavity.

5. The explosion-proof charging gun according to claim 1, characterized in that: The clamping force between the sealing sleeve and the main driving rod is smaller than the clamping force between the sealing ring and the main driving rod.

6. The explosion-proof charging gun according to claim 1, characterized in that: The cross section of the sealing sleeve is an n-shaped structure; a clamping ring is arranged inside the sealing ring, and the clamping ring clamps the main driving rod.

7. The explosion-proof charging gun according to claim 1, characterized in that: The cylindrical cavity is cylindrical; the annular cavity is annular, the inner diameter of the annular cavity is the same as the inner diameter of the cylindrical cavity, and the outer diameter of the annular cavity is larger than the outer diameter of the cylindrical cavity.

8. The explosion-proof charging gun according to claim 1, characterized in that: At least one annular groove is provided in the second region, and the cross section of the groove is triangular.

9. The explosion-proof charging gun according to claim 1, characterized in that: When the number of the grooves is more than two, at least one groove is connected to the air guide hole to form an annular air guide structure connected to the air guide hole and the air guide cavity.

10. The explosion-proof charging gun according to claim 1, characterized in that: The lower end of the main driving rod is connected to the screw hole at the top end of the auxiliary driving rod through a stud to clamp the bottom of the bellows; Correspondingly, the middle part of the bellows is a corrugated structure, the top end is a planar circular ring structure, the bottom end shrinks inwards, and finally forms a disc structure with holes.

11. The explosion-proof charging gun according to claim 1, characterized in that: A one-way valve is provided at the end of the balancing air pipe so that gas can only enter but cannot overflow from the end of the balancing air pipe; a quick-connect structure is also provided on the outside of the one-way valve to connect with an external inflation device.

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