A plastic pipe hot-melt sealing machine

Abstract

The present invention relates to a plastic pipe hot-melt capping machine, comprising a first support seat, a second support seat, and a third support seat arranged in sequence along the left and right directions, a first linear drive mechanism arranged on the first support seat, the right end of the first linear drive mechanism is connected to the optical axis by transmission, a third cylinder arranged on the second support seat, the right end of the piston rod of the third cylinder is connected to the heater by driving; a pneumatic chuck is arranged on the third support seat for inserting the inner core from right to left and clamping the inner core, a forming mold is arranged on the other side of the pneumatic chuck on the third support seat, the forming mold has a through hole arranged coaxially with the clamping hole of the pneumatic chuck, and the end of the through hole away from the pneumatic chuck can be inserted into the right end of the optical axis; the heater has a heating sleeve hole that can be inserted into the mold, and the heating sleeve hole can be passed through by the optical axis. The plastic pipe hot-melt capping machine can complete the capping of the new inner core structure of the liquid level gauge, can realize automatic control, and has high production efficiency.

Description

Technical Field

[0001] The invention relates to the field of equipment for manufacturing an inner core of a liquid level gauge, and in particular to a hot-melt capping machine for a plastic pipe. Background Art

[0002] A liquid level meter is an instrument that measures the level of a liquid medium in a container. There are mainly three types: magnetic levitation, pressure, ultrasonic, etc. However, most of these level meters have defects such as insufficient measurement accuracy, complex structure, and high price, which are far from meeting the needs of modern industrial production. In recent years, a new type of capacitive level meter has emerged.

[0003] The working principle of the capacitive level meter is to convert the position change of the measured object into capacitance for measurement. This type of level meter has the advantages of simple structure, high resolution, and fast dynamic response, so it is widely used in modern industrial production. The inner core, or inner electrode, is the key part of the capacitive level meter, such as the utility model patent with authorization announcement number CN207600559U, which discloses a capacitive level meter that can be shortened and adaptive to the medium. The structure of the inner core is to apply a layer of copper foil on the surface of an insulating tube, and divide the copper foil into several sections to insulate them from each other, and then put an insulating plastic tube on the outside. When the level meter is used, one end of the inner core is inserted into the liquid to be measured, and the end of the insulating tube is generally sealed by installing a plug, but it is not easy to ensure good sealing. In order to upgrade the product, the end of the plastic tube is hot-melted to form a structure that is integrated with the other parts of the plastic tube, with good internal sealing and insulation from the outside. Based on this new product, a device that can achieve hot melting and tight sealing of the plastic tube head is needed. Summary of the invention

[0004] The purpose of the invention is to provide a plastic pipe hot-melt capping machine to solve the problem of sealing the end of the inner core of a liquid level gauge.

[0005] To achieve the above object, the present invention adopts the following technical solution:

[0006] A plastic pipe hot-melt capping machine comprises a base with a length along the left-right direction, and a first support seat, a second support seat and a third support seat are arranged on the base in sequence along the left-right direction, a first linear drive mechanism is arranged on the first support seat, and the right end of the first linear drive mechanism is drivingly connected to an optical axis, a third cylinder is arranged on the second support seat, and the right end of the piston rod of the third cylinder is drivingly connected to a heater; a pneumatic chuck is arranged on the third support seat for allowing an inner core to be inserted from right to left and clamping the inner core, a forming mold is arranged on the other side of the third support seat, the forming mold has a through hole coaxially arranged with the clamping hole of the pneumatic chuck, the through hole has a limiting structure for limiting the insertion position of the inner core, and the end of the through hole away from the pneumatic chuck can be inserted into the right end of the optical axis; the heater has a heating sleeve hole that can be inserted into the mold, and the heating sleeve hole can allow the optical axis to pass through.

[0007] Furthermore, the first linear drive mechanism includes a first cylinder arranged on a first support seat, the piston rod of the first cylinder faces right, and the right end of the piston rod is connected to a second cylinder, the piston rod of the second cylinder faces right, and the right end of the piston rod is transmission-connected to the optical axis, and the optical axis moves to the right under the drive of the first cylinder and the second cylinder in turn.

[0008] Furthermore, the piston rod stroke of the second cylinder is equal to the extrusion stroke of the end of the insulating tube of the inner core.

[0009] Furthermore, a bearing seat is provided on the second supporting seat, and the bearing seat is provided with a linear bearing for the optical axis to pass through.

[0010] Furthermore, the second linear drive mechanism adopts a third cylinder.

[0011] Furthermore, two third cylinders that act synchronously are provided on the second support seat and are respectively located on both sides of the radial direction of the optical axis.

[0012] Furthermore, the heater is connected to the piston rod of the third cylinder via a heater fixing seat, a guide rod is provided on the second support seat along the left-right direction, and the heater fixing seat is guided and assembled on the guide rod.

[0013] Furthermore, the limiting structure is a limiting step arranged in the through hole, the through hole is a stepped hole with a right section aperture larger than a left section aperture, and the annular surface of the limiting step forms a limiting surface.

[0014] Furthermore, a fourth support seat is provided on the base, and the fourth support is located between the first support seat and the second support seat. A first cylinder positioning seat is provided on the first support seat, and a second cylinder positioning seat is provided on the second support seat. The first cylinder is connected between the first cylinder positioning seat and the second cylinder positioning seat, and the fourth support seat is provided with a through hole for the piston rod of the first cylinder to pass through.

[0015] Furthermore, guide rods are provided on the first cylinder positioning seat and the second cylinder positioning seat. The length of the guide rods is in the left-right direction. The guide rods pass through the second supporting seat to the right, and the heater is guided and matched with the guide rods.

[0016] Beneficial effects of the present invention:

[0017] When the hot-melt capping machine for plastic pipes of the present invention is used, the left end of the inner core of the liquid level gauge is inserted into the clamping hole of the pneumatic chuck until it reaches the limit position of the forming mold, the equipment is started, the pneumatic chuck clamps the inner core, and then the second linear drive mechanism drives the heater to push to the right, and is set on the mold, so that the left end of the inner core plastic pipe can be heated to a predetermined temperature (the temperature required for hot melting of the plastic pipe), and the heating is automatically stopped. The first linear drive mechanism drives the optical axis to move to the right, and the right end of the optical axis will squeeze the empty section on the left side of the plastic pipe to the right, so that the hot melting can be completed to form a capping structure. During the extrusion process, since there is a small gap between the outer plastic pipe and the insulating pipe in the center, the air therein can be discharged. After waiting for a short period of time, the linear drive mechanism withdraws, and the pneumatic chuck is released at the same time, so that the inner core after the hot-melt capping can be taken out. The hot-melt capping machine for plastic pipes can complete the capping of the new inner core structure of the liquid level gauge, and the end is not prone to defects such as pores, and can be automatically controlled with high production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a plastic pipe hot-melt capping machine of the present invention;

[0019] Figure 2 It is a schematic diagram of the partial structure of the inner core of the level gauge to be sealed.

[0020] The names corresponding to the marks in the figure are:

[0021] 1. First support seat, 2. First cylinder positioning seat, 3. First cylinder, 4. Second cylinder, 5. Connecting sleeve, 6. Optical axis, 7. Guide rod, 8. Base, 9. Second cylinder positioning seat, 10. Linear bearing, 11. Third cylinder, 12. Heater fixing seat, 13. Molding mold, 14. Pneumatic chuck fixing seat, 15. Pneumatic chuck, 151, Clamping hole, 16. Second support seat, 17. Heater, 171, Heating plate, 18. Third support seat, 19. Fourth support seat, 20. Insulating tube, 21. Plastic tube. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0023] Embodiments of the present invention:

[0024] like Figure 1-Figure 2As shown, a plastic pipe hot-melt capping machine includes a base with a length along the left-right direction, a first support seat, a second support seat, and a third support seat are arranged on the base in sequence along the left-right direction, and a first linear drive mechanism is arranged on the first support seat. The right end of the first linear drive mechanism is transmission-connected with an optical axis, which extends to the right and passes through the second support seat.

[0025] The first linear drive mechanism includes a first cylinder arranged on a first support seat, a piston rod of the first cylinder faces rightward, and the right end of the piston rod is connected to a second cylinder, a piston rod of the second cylinder faces rightward, and the right end of the piston rod is transmission-connected to the optical axis.

[0026] In order to improve the stability and assembly level of the first cylinder, a fourth support seat is provided on the base, and the fourth support is located between the first support seat and the second support seat. The first support seat is provided with a first cylinder positioning seat, and the second support seat is provided with a second cylinder positioning seat. The first cylinder is connected between the first cylinder positioning seat and the second cylinder positioning seat. Guide rods are provided through the first cylinder positioning seat and the second cylinder positioning seat. Two guide rods are provided and arranged in parallel front and back. The length of the guide rod is in the left and right direction, and the guide rod passes through the second support seat to the right. The fourth support seat is provided with a through hole for the piston rod of the first cylinder to pass through, and the second cylinder is located on the right side of the fourth support seat.

[0027] The right end of the piston rod of the second cylinder is connected to the left end of the optical axis through a connecting sleeve, similar to the function of a coupling, to achieve transmission connection. The piston rod stroke of the second cylinder is equal to the extrusion stroke of the plastic tube end of the inner core. After the plastic tube end is hot-melted, the second cylinder is activated.

[0028] The second support seat is provided with a third cylinder, and the left end of the cylinder body of the third cylinder is connected to the second support seat through the third cylinder positioning seat. The second support seat is provided with a bearing seat, and the bearing seat is provided with a linear bearing for the optical axis to pass through, so as to ensure good linear motion of the optical axis.

[0029] The second support seat is provided with two synchronously acting third cylinders, which are respectively located on both sides of the radial direction of the optical axis. The right end of the piston rod of the third cylinder is driven and connected with a heater, which is connected to the piston rod of the third cylinder through a heater fixing seat. The heater is an electric heater and belongs to the prior art. The heater has a heating sleeve hole that can be inserted into the mold, and the heating sleeve hole can allow the optical axis to pass through.

[0030] In order to ensure that the heater can also move in a straight line, two guide rods pass through the heater fixing seat and guide the assembly.

[0031] The third support seat is provided with a pneumatic chuck for inserting the inner core from right to left and clamping the inner core. The pneumatic chuck is connected to the third support seat through a pneumatic chuck fixing seat. In other embodiments, the third support seat can also be directly processed with a flange plate or other fixed connection structure for installing the pneumatic chuck, and no additional pneumatic chuck fixing seat is required. The pneumatic chuck belongs to the prior art, that is, a pneumatic chuck.

[0032] A forming mold is provided on the other side of the pneumatic chuck on the third support seat. The forming mold has a through hole coaxially arranged with the clamping hole of the pneumatic chuck. The through hole has a limiting structure for limiting the insertion position of the inner core. The end of the through hole away from the pneumatic chuck, i.e., the left end, can be inserted into the right end of the optical axis. The forming mold is also a sleeve-shaped structure.

[0033] The limiting structure is a limiting step set in the through hole, and the through hole is a stepped hole with a right section aperture larger than a left section aperture, and the annular surface of the limiting step forms a limiting surface. The right section aperture only needs to be slightly larger than the left section aperture to limit the insertion position of the insulating tube outside the inner core. In other embodiments, a small protrusion can also be set on the inner wall of the through hole to limit the insertion of the inner core.

[0034] The working principle of the plastic pipe hot-melt sealing machine of the present invention is as follows:

[0035] Insert the left end of the inner core of the level gauge into the clamping hole of the pneumatic chuck until it reaches the limit position of the molding die. Figure 2 The figure shows a part of the inner core. There is an empty section at the left end of the plastic tube, which is the part to be melted, about 1 cm in length. The plastic tube is made of polytetrafluoroethylene. Press the start button of the equipment, the equipment starts, the pneumatic chuck clamps the inner core, and then the third cylinder moves, its piston rod extends to the right, driving the heater fixing seat to push to the right, and the right side is set to the molding mold. The heating plate on the heater corresponds to the position of the left end of the plastic tube in the mold. The heater works and heats the left end of the plastic tube to the predetermined temperature (the temperature required for the hot melting of the plastic tube), and automatically stops heating. The first cylinder starts to move, and the piston rod of the first cylinder pushes the second cylinder and the optical axis to move to the right together. When the right end of the optical axis moves to the position flush with the left end of the plastic tube, the first cylinder just stops, which is limited by the stroke of the first cylinder. Then the second cylinder moves, and the piston rod of the second cylinder extends to the right, driving the optical axis to continue to move to the right. In this process, the right end of the optical axis will squeeze the empty section on the left side of the plastic tube to the right, so that the hot melting can be completed to form a head structure. During the extrusion process, the air in the plastic tube can be discharged due to the small gap between the plastic tube and the central insulating tube. After a short period of time, the first cylinder, the second cylinder and the third cylinder are retracted respectively, and the pneumatic chuck is released at the same time, so that the inner core with the hot-melt head can be taken out.

[0036] In other embodiments, other mechanisms may be used to replace the first cylinder and the second cylinder, such as an electric push rod, which can realize the function of linear pushing and set two stroke stages to push the optical axis to a position flush with the top of the insulating tube and squeeze the empty section of the insulating tube respectively.

[0037] In the above embodiment, two second cylinders are used as the second linear drive mechanism. Of course, there are several types of drive mechanisms, not limited to cylinders. In other embodiments, a second cylinder may be used, or a lead screw nut mechanism may be used instead. The lead screw nut mechanism can be directly set on the upper side of the base, located on the lower side of the heater, to linearly drive the heater. A lower support seat is provided on the base to install the lead screw nut mechanism. In this solution, the second support seat and the third cylinder positioning seat thereon can be omitted. At the same time, in order to improve the linear motion of the optical axis, a guide seat can be separately provided. A linear bearing is provided in the guide seat for the optical axis to pass through, but the guide seat is not limited to the structural form of the third support seat. In other embodiments, a smooth sleeve can also be used instead of a linear bearing to guide the optical axis.

[0038] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present invention.

Claims

1. A plastic pipe hot-melt sealing machine, characterized in that: The invention comprises a base having a length along the left-right direction, wherein a first support seat, a second support seat and a third support seat are sequentially arranged on the base along the left-right direction, a first linear drive mechanism is arranged on the first support seat, and the right end of the first linear drive mechanism is connected to the optical axis by transmission, a second linear drive mechanism is arranged on the second support seat, and the right end of the second linear drive mechanism is connected to the heater by driving; a pneumatic chuck is arranged on the third support seat for inserting the inner core from right to left and clamping the inner core, a forming mold is arranged on the other side of the pneumatic chuck on the third support seat, the forming mold has a through hole coaxially arranged with the clamping hole of the pneumatic chuck, the through hole has a limiting structure for limiting the insertion position of the inner core, and the through hole The end away from the pneumatic chuck can be used for the right end of the optical axis to be inserted; the heater has a heating sleeve hole that can be inserted into the mold, and the heating sleeve hole can allow the optical axis to pass through; the first linear drive mechanism includes a first cylinder arranged on a first support seat, the piston rod of the first cylinder faces right, and the right end of the piston rod is connected to a second cylinder, the piston rod of the second cylinder faces right, and the right end of the piston rod is transmission-connected to the optical axis, and the optical axis moves to the right under the drive of the first cylinder and the second cylinder in turn; the piston rod stroke of the second cylinder is equal to the extrusion stroke of the plastic tube end of the inner core, and a bearing seat is provided on the second support seat, and the bearing seat is provided with a linear bearing for the optical axis to pass through.

2. The plastic pipe hot-melt sealing machine according to claim 1, characterized in that: The second linear drive mechanism adopts a third cylinder.

3. The plastic pipe hot-melt sealing machine according to claim 2, characterized in that: The second support seat is provided with two third cylinders which act synchronously and are respectively located on both sides of the radial direction of the optical axis.

4. The plastic pipe hot-melt sealing machine according to claim 3, characterized in that: The heater is connected to the piston rod of the third cylinder through a heater fixing seat, a guide rod is arranged on the second supporting seat along the left and right directions, and the heater fixing seat is guided and assembled on the guide rod.

5. The plastic pipe hot-melt sealing machine according to claim 1, characterized in that: The limiting structure is a limiting step arranged in the through hole. The through hole is a stepped hole with a right section aperture larger than a left section aperture. The annular surface of the limiting step forms a limiting surface.

6. The plastic pipe hot-melt sealing machine according to claim 1, characterized in that: The base is provided with a fourth support seat, and the fourth support is located between the first support seat and the second support seat. The first support seat is provided with a first cylinder positioning seat, and the second support seat is provided with a second cylinder positioning seat. The first cylinder is connected between the first cylinder positioning seat and the second cylinder positioning seat, and the fourth support seat is provided with a through hole for the piston rod of the first cylinder to pass through.

7. The plastic pipe hot-melt sealing machine according to claim 6, characterized in that: A guide rod is provided on the first cylinder positioning seat and the second cylinder positioning seat. The length of the guide rod is along the left-right direction. The guide rod passes through the second supporting seat to the right. The heater is guided and matched with the guide rod.

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