Plunger inlet one-way valve machining process

Abstract

The invention relates to the technical field of one-way valve assembly, in particular to a plunger inlet one-way valve machining technology, and solves the problems that when an existing plunger inlet one-way valve is welded and assembled, plastic contains large glass fibers, the performance is poor after the plastic and metal are welded, the requirement for pulling-out force after welding cannot be met, and then the service life is affected. Comprising the following steps that S1, a plunger rod, a gland and a leather cup are assembled to form a columnar piston, the columnar piston is placed and fixed to a first welding jig, the outer side of the gland is sleeved with the leather cup, the leather cup is arranged between the plunger rod and the gland, and the first welding jig is fixed to an ultrasonic welding machine; and S2, the ultrasonic welding machine conducts high-frequency friction on the contact portion of the plunger rod and the gland through ultrasonic vibration. According to the one-way valve, the plastic and metal parts in the one-way valve are welded in a full-surrounding mode, the stability of welding and assembling of the plastic and the metal can be effectively improved, the production cost is reduced, and the pulling-out force performance of a product is improved.

Description

Technical Field

[0001] The invention relates to the technical field of one-way valve assembly, in particular to a processing technology for a plunger inlet one-way valve. Background Art

[0002] The plunger inlet check valve plays a key role in the air pressure system, ensuring that the gas can only flow in one direction, preventing the gas from flowing in the opposite direction when not needed, and ensuring the stability and safety of the system. When installed at the pump port, it can prevent the sudden increase in system pressure from damaging the air pump and protect other system components from damage. The plunger inlet check valve has a complex processing technology and has strict regulations on sealing, pull-off force and other properties. The plunger inlet check valve is composed of two welds by an ultrasonic welding machine, and the welding parts are made of plastic and metal.

[0003] When the plunger inlet check valve is currently welded and assembled, the plastic contains a large amount of glass fiber, and the performance after welding with the metal is poor, and the pull-out force requirements after welding cannot be met, thereby affecting the service life; therefore, it does not meet the existing needs, and we have proposed a plunger inlet check valve processing technology. Summary of the invention

[0004] The purpose of the present invention is to provide a plunger inlet check valve processing technology to solve the problem raised in the above background technology that when the plunger inlet check valve is welded and assembled, the plastic contains a large amount of glass fiber, the performance after welding with metal is poor, and the pull-off force requirement after welding cannot be met, thereby affecting the service life.

[0005] To achieve the above object, the present invention provides the following technical solution: a plunger inlet check valve processing technology, comprising the following steps: S1: Assemble the plunger rod, the gland and the leather cup to form a cylindrical piston, and place and fix it on a first welding jig, so that the leather cup is sleeved on the outside of the gland and arranged between the plunger rod and the gland, and fix the first welding jig on an ultrasonic welding machine; S2: The ultrasonic welding machine uses ultrasonic vibration to perform high-frequency friction on the contact part of the plunger rod and the gland, so that the contact part of the plunger rod and the gland can reach a hot melting state, and then the plunger rod and the gland can be welded, and the cylindrical piston is cooled after welding and assembly; S3: Then, the sealing sheet and the limiting column are sequentially placed at the end of the columnar piston, so that one end of the limiting column passes through the sealing sheet and is plugged into the inner side of the plunger rod. The columnar piston, the sealing sheet and the limiting column are assembled to form a one-way valve. The insertion amount of the limiting column relative to the plunger rod is adjusted according to the amount of movement of the sealing sheet, so as to meet the reciprocating linear motion of the one-way valve inside the plunger sleeve. S4: Control the pressure relief threshold between the sealing piece and the leather cup. Place and fix the one-way valve on the second welding fixture. Use an ultrasonic welding machine to weld the one-way valve. Specifically, use ultrasonic vibration to perform heat-melting welding on the gland and the undercut groove on the limit column, so as to realize the welding assembly of the one-way valve. After welding, use a test fixture to fix the one-way valve. S5: Specifically, the opposite ends of the plunger rod and the limit column in the one-way valve are connected to the test fixture, and then tension is applied to both ends of the test fixture. At this time, the tension at both ends of the one-way valve acts in opposite directions along the axis of the plunger rod, so that the pull-off force of the one-way valve can be tested. Pressure sensors are provided at both ends of the test fixture, so that the tension on the plunger rod and the limit column can be monitored in real time through the pressure sensors, thereby facilitating the detection of the pull-off force on the one-way valve.

[0006] Preferably, the columnar piston is composed of a plunger rod, a gland and a leather cup, the middle portion of the gland passes through the leather cup and is plugged and installed with the plunger rod, and the plunger rod and the gland are fixed by ultrasonic welding.

[0007] Preferably, the one-way valve is composed of a columnar piston, a sealing sheet and a limiting column, one end of the limiting column passes through the sealing sheet and is plugged and installed with the gland, and the limiting column and the gland are fixed by ultrasonic welding.

[0008] Preferably, the gland is fixed to the plunger rod and the limit column by welding with an ultrasonic welding machine, and the ultrasonic welding machine is fixedly connected to the columnar piston and the one-way valve by a first welding jig and a second welding jig, respectively.

[0009] Preferably, the welding rib size of the gland is 0.5*0.5mm, the plunger rod and the gland are both made of plastic, the plastic model of the plunger rod and the gland is PA46-GF50, the welding rib size of the gland after welding is 0.5*1.0mm, and the model of the limit column is SUS303.

[0010] Preferably, the outer surface of the limit column near one end of the plunger rod is provided with an undercut groove, the inner side of the undercut groove is filled with glue, the amount of glue is consistent with the undercut amount of the undercut groove, the inner circle size tolerance of the middle part of the pressure cover is 1.2±0.05, the outer edge size tolerance of one end of the limit column is 1.5-0.04 / -0.08, and the limit column and the pressure cover are interference fit.

[0011] Preferably, the sealing sheet is arranged between the limiting column and the pressure cover, and the sealing sheet slides linearly back and forth along the axis of the limiting column.

[0012] Preferably, the first welding jig and the second welding jig both include a jig base, a rod body positioning plate is fixedly installed on the front end of the upper end surface of the jig base, a rod body clamping bent plate is fixedly installed on one side of the rod body positioning plate, a first slide plate is slidably connected to the rear end of the upper end surface of the jig base, the first slide plate is connected to the jig base through a first adjusting rod, two second slide plates are slidably connected to the inner side of the first slide plate, the first slide plate is connected to the two second slide plates through the second adjusting rod, one end of the first adjusting rod passes through the jig base and is threadedly connected to the middle part of the first slide plate, both ends of the second adjusting rod are provided with external threads with opposite rotation directions, the two ends of the second adjusting rod are threadedly connected to the two second slide plates, and the two second slide plates slide in opposite directions along the axis of the second adjusting rod.

[0013] Preferably, the first welding fixture also includes a first positioning slide fixedly connected to the upper end of the second slide, the plunger rod is inserted between the rod body positioning plate and the rod body clamping bent plate, and the pressure cover is arranged between the two first positioning slides and is connected to the two second slides through the first positioning slides.

[0014] Preferably, the second welding fixture also includes a second positioning slide fixedly connected to the upper end of the second slide, the plunger rod is inserted between the rod body positioning plate and the rod body clamping bending plate, and the limit column is arranged between the two second positioning slides and is connected to the two second slides through the second positioning slides.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention utilizes an ultrasonic welding machine to perform two-pass welding assembly on the one-way valve, which can ensure the overall service life, and performs full-enclosed welding on the plastic and metal parts in the one-way valve, which can effectively improve the stability of the plastic and metal welding assembly, reduce production costs, and improve the product's pull-off force performance.

[0016] In the figure: 1. plunger rod; 2. sealing plate; 3. limit column; 4. pressure cover; 5. leather cup; 6. cylindrical piston; 7. one-way valve; 8. first welding fixture; 9. second welding fixture; 10. plunger sleeve; 11. fixture base; 12. rod body positioning plate; 13. rod body clamping bent plate; 14. first slide plate; 15. first adjusting rod; 16. second slide plate; 17. second adjusting rod; 18. first positioning slide; 19. second positioning slide. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the assembly, welding and testing of the one-way valve of the present invention; Figure 2 It is a schematic diagram of the overall process of the present invention; Figure 3 It is a table diagram of the structural materials of the present invention as a whole; Figure 4 A table diagram of gap dimensions for welding of a one-way valve of the present invention; Figure 5 It is a structural schematic diagram of the one-way valve of the present invention; Figure 6 It is a schematic diagram of the shear force type energy conducting point of the gland of the present invention; Figure 7 It is a structural schematic diagram of a first welding jig of the present invention; Figure 8 It is a schematic structural diagram of the second welding fixture of the present invention. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] See also Figures 1 to 6 , an embodiment provided by the present invention: a plunger inlet check valve processing technology, comprising the following steps: S1: Assemble the plunger rod 1, the gland 4 and the leather cup 5 to form a cylindrical piston 6, and place and fix it on the first welding jig 8, so that the leather cup 5 is sleeved on the outside of the gland 4 and arranged between the plunger rod 1 and the gland 4, and fix the first welding jig 8 on the ultrasonic welding machine; S2: The ultrasonic welding machine performs high-frequency friction on the contact part of the plunger rod 1 and the gland 4 through ultrasonic vibration, so that the contact part of the plunger rod 1 and the gland 4 can reach a hot melting state, and then the plunger rod 1 and the gland 4 can be welded, and the cylindrical piston 6 is cooled after being welded and assembled; S3: Then, the sealing sheet 2 and the limiting column 3 are sequentially placed at the end of the columnar piston 6, so that one end of the limiting column 3 passes through the sealing sheet 2 and is plugged into the inner side of the plunger rod 1. The one-way valve 7 is formed by assembling the columnar piston 6, the sealing sheet 2 and the limiting column 3. The insertion amount of the limiting column 3 relative to the plunger rod 1 is adjusted according to the movement amount of the sealing sheet 2, so as to meet the reciprocating linear motion of the one-way valve 7 inside the plunger sleeve 10. S4: Control the pressure relief threshold between the sealing sheet 2 and the leather cup 5, place and fix the one-way valve 7 on the second welding fixture 9, and perform welding operation on the one-way valve 7 by using an ultrasonic welding machine. Specifically, the pressure cover 4 and the undercut groove on the limit column 3 are heat-melted and welded by ultrasonic vibration, so as to realize the welding assembly of the one-way valve 7. After the welding is completed, the one-way valve 7 is fixed by using a test fixture; S5: Specifically, the opposite ends of the plunger rod 1 and the limit column 3 in the one-way valve 7 are connected to the test fixture, and then a pulling force is applied to both ends of the test fixture. At this time, the pulling forces at both ends of the one-way valve 7 act in opposite directions along the axis of the plunger rod 1, so that the pull-off force of the one-way valve 7 can be tested. Pressure sensors are provided at both ends of the test fixture, so that the tension applied to the plunger rod 1 and the limit column 3 can be monitored in real time through the pressure sensors, thereby facilitating the detection of the pull-off force applied to the one-way valve 7.

[0020] See also Figure 4 and Figure 5 The columnar piston 6 is composed of a plunger rod 1, a pressure cover 4 and a leather cup 5. The middle part of the pressure cover 4 passes through the leather cup 5 and is plugged and installed with the plunger rod 1. The plunger rod 1 and the pressure cover 4 are fixed by ultrasonic welding. The one-way valve 7 is composed of a columnar piston 6, a sealing plate 2 and a limit column 3. One end of the limit column 3 passes through the sealing plate 2 and is plugged and installed with the pressure cover 4. The limit column 3 and the pressure cover 4 are fixed by ultrasonic welding. The sealing plate 2 is arranged between the limit column 3 and the pressure cover 4. The sealing plate 2 slides linearly back and forth along the axis of the limit column 3. By fixing the limit column 3 and the pressure cover 4 by ultrasonic welding, the leather cup 5 can be effectively kept from deforming when under pressure.

[0021] See also Figure 4 The gland 4 is welded and fixed to the plunger rod 1 and the limit column 3 by an ultrasonic welding machine. The welding rib size of the gland 4 is 0.5*1.0mm after welding. The model of the limit column 3 is SUS303. The welding rib size of the gland 4 is 0.5*0.5mm. The plunger rod 1 and the gland 4 are both made of plastic. The plastic model of the plunger rod 1 and the gland 4 is PA46-GF50. By optimizing the welding rib size of the gland 4, the welding connection strength can be effectively improved.

[0022] See also Figures 3 to 5 The outer surface of the limit column 3 near one end of the plunger rod 1 is provided with an undercut groove, and the inner side of the undercut groove is filled with glue, and the amount of glue is consistent with the undercut amount of the undercut groove. The inner circle size tolerance of the middle part of the pressure cover 4 is 1.2±0.05, and the outer edge size tolerance of one end of the limit column 3 is 1.5-0.04 / -0.08. The limit column 3 and the pressure cover 4 are interference fit. By filling glue between the plunger rod 1 and the limit column 3, the stability of the welding between the plunger rod 1 and the limit column 3 can be further improved.

[0023] See also Figure 1 The ultrasonic welding machine is fixedly connected to the cylindrical piston 6 and the one-way valve 7 through the first welding jig 8 and the second welding jig 9 respectively. The first welding jig 8 and the second welding jig 9 facilitate positioning, assembly and accurate welding of the cylindrical piston 6 and the one-way valve 7.

[0024] See also Figure 7 and Figure 8 The first welding jig 8 and the second welding jig 9 both include a jig base 11, a rod body positioning plate 12 is fixedly installed on the front end of the upper end surface of the jig base 11, a rod body pressing bent plate 13 is fixedly installed on one side of the rod body positioning plate 12, a first slide plate 14 is slidably connected to the rear end of the upper end surface of the jig base 11, the first slide plate 14 is connected to the jig base 11 through a first adjusting rod 15, two second slide plates 16 are slidably connected to the inner side of the first slide plate 14, the first slide plate 14 is connected to the two second slide plates 16 through a second adjusting rod 17, and the first adjusting rod 1 One end of the second adjusting rod 17 passes through the jig base 11 and is connected to the middle part of the first slide plate 14 by a thread, and both ends of the second adjusting rod 17 are provided with external threads with opposite rotation directions. Both ends of the second adjusting rod 17 are connected to the two second slide plates 16 by a thread, and the two second slide plates 16 slide in opposite directions along the axis of the second adjusting rod 17. The second slide plates 16 are adjusted in XY directions by the first adjusting rod 15 and the second adjusting rod 17, so that the pull-off force test can be performed when the rod body positioning plate 12 and the rod body clamping bent plate 13 position and lock the plunger rod 1.

[0025] See also Figure 7 The first welding fixture 8 also includes a first positioning slide 18 fixedly connected to the upper end of the second slide 16. The plunger rod 1 is inserted between the rod body positioning plate 12 and the rod body clamping bent plate 13. The pressure cover 4 is arranged between the two first positioning slides 18 and is connected to the two second slides 16 through the first positioning slides 18. The pressure cover 4 can be positioned through the two first positioning slides 18, thereby maintaining stability during welding and pull-off force testing.

[0026] See also Figure 8 The second welding fixture 9 also includes a second positioning slide 19 fixedly connected to the upper end of the second slide 16. The plunger rod 1 is inserted between the rod body positioning plate 12 and the rod body clamping bent plate 13. The limit column 3 is arranged between the two second positioning slides 19 and is connected to the two second slides 16 through the second positioning slides 19. The limit column 3 can be positioned by the two second positioning slides 19, thereby maintaining stability during welding and pull-off force testing.

[0027] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A plunger inlet check valve processing technology, characterized in that: The steps include: S1: Assembling the plunger rod (1), the gland (4) and the leather cup (5) to form a cylindrical piston (6), and placing and fixing the piston on a first welding jig (8), so that the leather cup (5) is sleeved on the outer side of the gland (4) and arranged between the plunger rod (1) and the gland (4), and fixing the first welding jig (8) on an ultrasonic welding machine; S2: The ultrasonic welding machine uses ultrasonic vibration to perform high-frequency friction on the contact portion of the plunger rod (1) and the gland (4), thereby achieving a hot melt state at the contact portion of the plunger rod (1) and the gland (4), thereby performing a welding operation on the plunger rod (1) and the gland (4), and cooling the columnar piston (6) after the columnar piston (6) is welded and assembled; S3: Then, the sealing sheet (2) and the limiting column (3) are sequentially placed at the end of the columnar piston (6), so that one end of the limiting column (3) passes through the sealing sheet (2) and is plugged into the inner side of the plunger rod (1). The one-way valve (7) is formed by assembling the columnar piston (6), the sealing sheet (2) and the limiting column (3). The insertion amount of the limiting column (3) relative to the plunger rod (1) is adjusted according to the movement amount of the sealing sheet (2), so as to satisfy the one-way valve (7) in the process of reciprocating linear movement inside the plunger sleeve (10); S4: The pressure relief threshold between the sealing sheet (2) and the leather cup (5) is controlled, the one-way valve (7) is placed and fixed on the second welding fixture (9), and the one-way valve (7) can be welded by an ultrasonic welding machine. Specifically, ultrasonic vibration is used to perform heat-melting welding on the undercut groove on the pressure cover (4) and the limit column (3), thereby realizing the welding assembly of the one-way valve (7). After the welding is completed, the one-way valve (7) is fixed by using a test fixture; S5: Specifically, the opposite ends of the plunger rod (1) and the limit column (3) in the one-way valve (7) are connected to the test fixture, and then a tensile force is applied to the two ends of the test fixture. At this time, the tensile forces at the two ends of the one-way valve (7) act in opposite directions along the axis of the plunger rod (1), so that the pull-off force of the one-way valve (7) can be tested. Pressure sensors are provided at both ends of the test fixture, so that the tensile forces applied to the plunger rod (1) and the limit column (3) can be monitored in real time through the pressure sensors, thereby facilitating the detection of the pull-off force applied to the one-way valve (7).

2. A plunger inlet check valve processing technology according to claim 1, characterized in that: The columnar piston (6) is composed of a plunger rod (1), a gland (4) and a leather cup (5); the middle portion of the gland (4) passes through the leather cup (5) and is plugged and installed with the plunger rod (1); the plunger rod (1) and the gland (4) are fixed by ultrasonic welding.

3. A plunger inlet check valve processing technology according to claim 1, characterized in that: The one-way valve (7) is composed of a columnar piston (6), a sealing sheet (2) and a limiting column (3); one end of the limiting column (3) passes through the sealing sheet (2) and is plugged into and installed with the gland (4); the limiting column (3) and the gland (4) are fixed by ultrasonic welding.

4. A plunger inlet check valve processing technology according to claim 1, characterized in that: The gland (4) is fixed to the plunger rod (1) and the limit column (3) by welding using an ultrasonic welding machine, and the ultrasonic welding machine is fixedly connected to the columnar piston (6) and the one-way valve (7) by a first welding jig (8) and a second welding jig (9), respectively.

5. A plunger inlet check valve processing technology according to claim 1, characterized in that: The size of the welding rib of the gland (4) is 0.5*0.5 mm. The plunger rod (1) and the gland (4) are both made of plastic. The plastic model of the plunger rod (1) and the gland (4) is PA46-GF50. The size of the welding rib of the gland (4) after welding is 0.5*1.0 mm. The model of the limit column (3) is SUS303.

6. A plunger inlet check valve processing technology according to claim 1, characterized in that: An undercut groove is provided on the outer surface of the limit column (3) near one end of the plunger rod (1), and the inner side of the undercut groove is filled with glue, the amount of the glue is consistent with the undercut amount of the undercut groove, the inner circle size tolerance of the middle part of the gland (4) is 1.2±0.05, the outer edge size tolerance of one end of the limit column (3) is 1.5-0.04 / -0.08, and the limit column (3) and the gland (4) are interference fit.

7. A plunger inlet check valve processing technology according to claim 1, characterized in that: The sealing sheet (2) is arranged between the limiting column (3) and the pressure cover (4), and the sealing sheet (2) slides linearly back and forth along the axis of the limiting column (3).

8. A plunger inlet check valve processing technology according to claim 4, characterized in that: The first welding jig (8) and the second welding jig (9) both comprise a jig base (11), a rod body positioning plate (12) being fixedly mounted on the front end of the upper end surface of the jig base (11), a rod body pressing bending plate (13) being fixedly mounted on one side of the rod body positioning plate (12), a first slide plate (14) being slidably connected to the rear end of the upper end surface of the jig base (11), the first slide plate (14) being connected to the jig base (11) via a first adjusting rod (15), and two second slide plates (14) being slidably connected to the inner side of the first slide plate (14). A slide plate (16), wherein the first slide plate (14) is connected to the two second slide plates (16) via a second adjustment rod (17), one end of the first adjustment rod (15) passes through the fixture base (11) and is connected to the middle portion of the first slide plate (14) via a thread, both ends of the second adjustment rod (17) are provided with external threads with opposite rotation directions, both ends of the second adjustment rod (17) are connected to the two second slide plates (16) via a thread, and the two second slide plates (16) slide in opposite or opposite directions along the axis of the second adjustment rod (17).

9. A plunger inlet check valve processing technology according to claim 8, characterized in that: The first welding fixture (8) further comprises a first positioning slide (18) fixedly connected to the upper end of the second slide plate (16); the plunger rod (1) is inserted between the rod body positioning plate (12) and the rod body clamping bent plate (13); the pressure cover (4) is arranged between the two first positioning slides (18) and is connected to the two second slide plates (16) via the first positioning slides (18).

10. A plunger inlet check valve processing technology according to claim 8, characterized in that: The second welding fixture (9) further comprises a second positioning slide (19) fixedly connected to the upper end of the second slide plate (16); the plunger rod (1) is inserted between the rod body positioning plate (12) and the rod body clamping bent plate (13); the limit column (3) is arranged between the two second positioning slides (19) and is connected to the two second slide plates (16) via the second positioning slides (19).

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