Reciprocating type safe injection molding gun

Abstract

The utility model discloses a reciprocating safety injection gun, which is internally provided with a through hole penetrating from top to bottom, and comprises a propelling screw rod, a cylinder body, a plunger, a plastic loading cavity, a stop valve, a joint body and a movable nut, one end of the propelling screw and one end of the plunger abut against each other in the cylinder body, and the other ends respectively extend out of two ends of the cylinder body; the lower end of the cylinder body is connected with a plastic containing cavity provided with an injection molding opening, the lower end of the plastic containing cavity is connected with a connector body through a stop valve, and the lower end of the connector body is rotatably connected with a movable nut so as to be connected with a grease injection valve of a sleeve pair seal through the movable nut. And the plunger is driven by pushing the propelling screw rod to push the injection molding liquid to the grease injection valve so as to realize injection molding sealing of the sleeve pair seal. The injection molding process is safe and controllable, the movable nut is connected with the wellhead device and the grease injection valve of the gate valve, and the connection direction can be adjusted at will; and through manual operation, cooperation of a hydraulic pump and a pipeline is not needed, and use is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of maintenance and repair of wellhead devices and casing heads in the oil and gas industry, in particular to a reciprocating safety injection gun. Background Art

[0002] During on-site maintenance and repair of wellhead equipment and casing heads, secondary injection molding of the casing secondary seal is required. However, existing injection molding guns cannot be directly used for wellhead maintenance operations. Therefore, a design of an injection molding gun specifically for wellhead maintenance operations is needed. Existing injection molding guns require coordination with hydraulic pumps or pipelines to achieve secondary injection molding and sealing. However, when injection molding is required during inspections, the hydraulic pumps and pipelines are often not available on-site to perform the injection molding in a timely manner. Utility Model Content

[0003] The purpose of the utility model is to provide a reciprocating safety injection molding gun, which is used to solve the problem in the prior art that the injection molding gun needs to cooperate with a hydraulic pump or pipeline to achieve secondary injection molding sealing, thereby causing abnormal injection molding.

[0004] The utility model solves the above problems through the following technical solutions:

[0005] A reciprocating safety injection molding gun is formed with a through hole running from top to bottom, comprising an advancing screw, a cylinder body, a plunger, a molding cavity, a stop valve, a joint body and a live nut; one end of the advancing screw and one end of the plunger are in contact with each other in the cylinder body, and the other ends extend from both ends of the cylinder body respectively; the lower end of the cylinder body is connected to the molding cavity with an injection port, the lower end of the molding cavity is connected to the joint body through the stop valve, and the lower end of the joint body is rotatably connected to the live nut, which is connected to the grease injection valve of the sleeve secondary seal through the live nut. By pushing the advancing screw, the plunger is driven to push the injection liquid to the grease injection valve to achieve injection sealing of the sleeve secondary seal.

[0006] As a further improvement, the lower end of the cylinder body is connected to the plastic cavity through an internal thread.

[0007] As a further improvement, an end cap is provided at the lower end of the molding cavity, and a double male connector is connected through the end cap to connect to the stop valve through the double male connector.

[0008] As a further improvement, copper pads are provided at both ends of the double male connector.

[0009] As a further improvement, a grease injection valve thread connected to the grease injection valve is formed in the movable nut, so as to be connected to the grease injection valve thread through the grease injection valve thread.

[0010] As a further improvement, a sealing gasket is provided between the grease injection valve and the connector body.

[0011] As a further improvement, a third O-ring is further provided in the molding cavity for sealing between the molding cavity and the plunger.

[0012] As a further improvement, the upper end of the plunger is adapted to the inner diameter of the cylinder body, and a plurality of grooves for accommodating the second O-rings are formed on the upper end of the plunger.

[0013] As a further improvement, the advancing screw is plugged into the plunger.

[0014] As a further improvement, the outer sleeve of the lower end of the propulsion screw is provided with a thrust bearing adapted to the inner diameter of the cylinder body, and a bearing spacer ring is provided below the thrust bearing; a plurality of first O-rings are embedded outside the bearing spacer ring.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0016] The utility model can be used for the injection of various solid preparations; the injection process is safe and controllable, and the connection with the wellhead device and the grease injection valve of the gate valve is made through a movable nut, and the connection direction can be adjusted arbitrarily; and it is manually operated without the need for a hydraulic pump and pipelines, and is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural diagram of a reciprocating safety injection molding gun of the utility model;

[0018] Figure 2 This is a schematic structural diagram of the propulsion screw in the present utility model;

[0019] Figure 3 It is a structural diagram of the plunger in the utility model.

[0020] Reference numerals:

[0021] 1. Propelling screw; 2. Thrust bearing; 3. First O-ring; 4. Bearing spacer; 5. Second O-ring; 6. Grease nipple; 7. Cylinder body; 8. Third O-ring; 9. Plunger; 10. Molding cavity; 11. End cap; 12. Copper gasket; 13. Double male connector; 14. Stop valve; 15. Connector body; 16. Gasket; 17. Live nut; 101. First step; 102. Second step; 103. Third step; 104. Propelling hole; 105. Injection port; 106. Grease injection valve thread. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] Example

[0024] Refer to the attached Figure 1-3 A reciprocating safety injection molding gun is formed with a through hole running from top to bottom, including an advancing screw 1, a cylinder 7, a plunger 9, a molding cavity 10, a stop valve 14, a joint body 15 and a live nut 17; one end of the advancing screw 1 and one end of the plunger 9 are abutted in the cylinder 7, and the other ends extend from both ends of the cylinder 7 respectively; the lower end of the cylinder 7 is connected to the molding cavity 10 with an injection port 105, and the lower end of the molding cavity 10 is connected to the joint body 15 through the stop valve 14, and the lower end of the joint body 15 is rotatably connected to the live nut 17, which is connected to the grease injection valve of the sleeve secondary seal through the live nut 17. By pushing the advancing screw 1, the plunger 9 drives the injection liquid to the grease injection valve to achieve injection sealing of the sleeve secondary seal.

[0025] In a specific embodiment, Figure 1-3 As shown, a reciprocating safety injection molding gun is formed with a through hole running from top to bottom in the entire injection molding gun, which includes an advancing screw 1, a cylinder body 7, a plunger 9, a molding cavity 10, an end cap 11, a double male connector 13, a stop valve 14, a connector body 15 and a live nut 17. A through hole is formed in the cylinder body 7, and the advancing screw 1 and the plunger 9 abut against each other in the through hole and extend from both ends of the cylinder body 7 respectively; the lower end of the cylinder body 7 is connected to the molding cavity 10 through an internal thread, and the end of the plunger 9 extending out of the cylinder body 7 is arranged in the through hole of the molding cavity 10, and an injection port 105 is opened on the through hole of the molding cavity 10 to fill the injection molding gun with injection liquid through the injection port 105. The lower end of the molding cavity 10 is connected to the end cap 11 through an external thread, the lower end of the end cap 11 is connected to the double male connector 13 through an internal thread, the lower end of the double male connector 13 is connected to the stop valve 14 through an external thread, the lower end of the stop valve 14 is connected to the joint body 15 through an internal thread, and the lower end of the joint body 15 is connected to a rotatable live nut 17, which is connected to the grease injection valve of the sleeve sub-seal through the live nut 17.

[0026] Furthermore, a grease injection valve thread 106 connected to the grease injection valve is formed in the movable nut 17 so as to be threadedly connected to the grease injection valve via the grease injection valve thread 106 .

[0027] Preferably, a sealing gasket 16 is provided between the grease injection valve and the connector body 15 to protect the end of the connector body 15 near the grease injection valve from squeezing. Copper gaskets 12 are provided at both ends of the double male connector 13 to protect both ends from squeezing. In this embodiment, a shutoff valve 14 is used to both shut off the grease injection process and control flow.

[0028] A third O-ring 8 is also provided in the molding cavity 10 to seal between the molding cavity 10 and the plunger 9. The diameter of the through hole in the molding cavity 10 is transitionally matched to the diameter of the lower end of the plunger 9 to ensure that liquid does not flow from between the molding cavity 10 and the plunger 9 into the cylinder 7 during the grease injection process.

[0029] In another alternative embodiment, the outer portion of the upper end of the plunger 9 conforms to the inner diameter of the cylinder 7 and is formed with grooves for accommodating the second O-rings 5. In this embodiment, the upper end of the plunger 9 is plugged into the lower end of the propulsion screw 1 to ensure a secure connection. The lower end of the propulsion screw 1 is fitted with a thrust bearing 2 conforming to the inner diameter of the cylinder 7, and a bearing spacer ring 4 is positioned below the thrust bearing 2. Several first O-rings 3 are embedded in the bearing spacer ring 4.

[0030] Preferably, the lower end of the advancing screw 1 is located outside the cylinder 7 in a stepped structure, wherein the diameter of the first step 101 is adapted to the inner diameter of the cylinder 7, and the second step 102 is provided with a thrust bearing 2 on its outer sleeve. The thrust bearing ensures a tight connection with the cylinder 7 and reduces friction, facilitating the upward and downward movement of the advancing screw 1; the third step 103 cooperates with the upper end of the plunger 9 and can also connect the advancing screw 1 to the plunger 9. A propulsion hole 104 is formed at the upper end of the advancing screw 1 to facilitate cooperation with other workpieces.

[0031] Preferably, a grease nipple 6 is further provided on the cylinder body 7, through which grease is added to the cylinder body 7 to lubricate components such as the thrust bearing and prevent the cylinder body from being damaged.

[0032] During use, the grease injection valve threaded on the movable nut 17 at the lower end of the injection gun is connected to the grease injection valve of the sleeve secondary seal. The sealant is then loaded into the molding cavity 10 through the injection port 105. The stop valve 14 is then opened, and the push screw 1 is squeezed downward and rotated clockwise to push the plunger 9 and inject the sealant into the sleeve secondary seal. After the injection molding is completed, the push screw 1 is rotated counterclockwise to pull the plunger 9 back to its original position. The sealant is then loaded into the molding cavity 10 and injection molding can be repeated. This cycle continues until the sleeve secondary seal is activated to form a secondary seal.

[0033] The reciprocating safety injection gun of the utility model can also be used for the injection of other solid preparations; the injection process is safe and controllable, and the gun is connected to the wellhead device and the grease injection valve of the gate valve through a movable nut, and the connection direction can be adjusted arbitrarily; and the gun is manually operated without the need for a hydraulic pump and pipelines, and is easy to use.

[0034] Although the present invention is described herein with reference to the illustrative embodiments of the present invention, the above embodiments are merely preferred embodiments of the present invention, and the embodiments of the present invention are not limited to the above embodiments. It should be understood that those skilled in the art can design many other modifications and implementations, which will fall within the scope and spirit of the principles disclosed in this application.

Claims

1. A reciprocating safety injection molding gun having a through hole formed therein extending from top to bottom, characterized in that: It includes an advancing screw, a cylinder body, a plunger, a molding cavity, a stop valve, a joint body and a live nut; one end of the advancing screw and one end of the plunger are in contact with each other in the cylinder body, and the other ends extend from both ends of the cylinder body respectively; the lower end of the cylinder body is connected to the molding cavity with an injection port, the lower end of the molding cavity is connected to the joint body through the stop valve, and the lower end of the joint body is rotatably connected to the live nut, which is connected to the grease injection valve of the sleeve secondary seal through the live nut. By pushing the advancing screw, the plunger is driven to push the injection liquid to the grease injection valve to realize the injection sealing of the sleeve secondary seal.

2. A reciprocating safety injection molding gun according to claim 1, characterized in that: The lower end of the cylinder body is connected to the plastic cavity through an internal thread.

3. A reciprocating safety injection molding gun according to claim 1, characterized in that: The lower end of the molding cavity is provided with an end cap, which is connected to a double male connector through the end cap, so as to be connected to the stop valve through the double male connector.

4. A reciprocating safety injection molding gun according to claim 3, characterized in that: Copper pads are provided at both ends of the double male connector.

5. A reciprocating safety injection molding gun according to claim 1, characterized in that: A grease injection valve thread connected to the grease injection valve is formed in the movable nut, so that the movable nut is connected to the grease injection valve thread through the grease injection valve thread.

6. A reciprocating safety injection molding gun according to claim 5, characterized in that: A sealing gasket is provided between the grease injection valve and the connector body.

7. A reciprocating safety injection molding gun according to claim 1, characterized in that: A third O-type sealing ring is also provided in the molding cavity for sealing between the molding cavity and the plunger.

8. A reciprocating safety injection molding gun according to any one of claims 1 to 7, characterized in that: The upper end of the plunger is adapted to the inner diameter of the cylinder body, and a plurality of grooves for accommodating second O-type sealing rings are formed on the upper end of the plunger.

9. The reciprocating safety injection molding gun according to claim 8, characterized in that: The advancing screw is plugged into the plunger.

10. The reciprocating safety injection molding gun according to claim 8, characterized in that: The outer sleeve of the lower end of the propulsion screw is provided with a thrust bearing adapted to the inner diameter of the cylinder body, and a bearing spacer ring is provided below the thrust bearing; a plurality of first O-type sealing rings are embedded outside the bearing spacer ring.

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