Production mold for built-in rubber ring of PVC (polyvinyl chloride) water supply pipe

Abstract

The utility model provides a PVC (polyvinyl chloride) water supply pipe built-in rubber ring production mould which comprises a conical section, a front column body, a rubber ring groove and a rear column body which are sequentially connected from front to back, an exhaust pipe is arranged at the central axis of the rear column body, a plurality of radial negative pressure holes are uniformly formed in the rubber ring groove, the radial negative pressure holes are communicated with the exhaust pipe, and the exhaust pipe is communicated with the front column body. The production mold for the built-in rubber ring of the PVC water supply pipe further comprises a plurality of PTC heaters arranged in the rear column body, and the PTC heaters evenly surround the periphery of the exhaust pipe so as to heat the production mold from the inside. The production mold for the built-in rubber ring of the PVC water supply pipe has the advantage of being capable of improving the yield and stability of the built-in rubber ring product of a thin-walled pipe.

Description

Technical Field

[0001] The utility model relates to the technical field of PVC water supply pipe production, in particular to a production mould for a built-in rubber ring of a PVC water supply pipe. Background Art

[0002] When connecting PVC water supply pipes, a sealing rubber ring needs to be installed inside the socket before the spigot is inserted into the socket to ensure a tight seal at the joint. Traditionally, there are two ways to install the sealing rubber ring: one is to create a groove in the socket, into which the sealing rubber ring is placed. This structure can easily shift or deform the rubber ring when inserted into the spigot, thereby reducing sealing performance. The other method is to fix the sealing rubber ring inside the socket (also known as a built-in rubber ring), forming an integrated structure. This structure is easy to install, but the production process is more complicated.

[0003] During the production of traditional built-in rubber rings, the sealing rubber ring is first placed on a flaring mold with negative pressure holes cut radially along the mold. The PVC water supply pipe socket is then heated to a certain temperature and placed on the flaring mold for flaring. Under the action of negative pressure, the flared end is adsorbed to the mold surface. Finally, cooling water is used to cool it down and set the sealing rubber ring in place. However, the existing production technology is not mature for thin-walled PVC water supply pipes. On the one hand, the temperature difference between the socket and the flaring mold is large, making the thin-walled pipe unstable. On the other hand, the groove for the sealing rubber ring in the existing flaring mold is not appropriately sized and easily shifted. Both of these factors lead to a decrease in product yield.

[0004] In order to solve the above problems, people have been seeking an ideal technical solution. Summary of the Invention

[0005] The purpose of the utility model is to address the deficiencies of the existing technology and thus provide a PVC water supply pipe built-in rubber ring production mold that can improve the yield and stability of thin-walled pipe built-in rubber ring products.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a PVC water supply pipe built-in rubber ring production mold, including a tapered section, a front column body, a rubber ring groove and a rear column body connected in sequence from front to back, an exhaust pipe is provided at the central axis of the rear column body, and a plurality of radial negative pressure holes are evenly opened on the rubber ring groove, and the plurality of radial negative pressure holes are connected to the exhaust pipe. The PVC water supply pipe built-in rubber ring production mold also includes a plurality of PTC heaters built into the rear column body, and the plurality of PTC heaters are evenly surrounded around the exhaust pipe to heat the production mold from the inside.

[0007] Based on the above, it also includes a temperature sensor and a temperature controller. The temperature sensor monitors the temperature of the production mold and transmits it to the temperature controller. The temperature controller controls the on and off of the PTC heater power supply circuit according to whether the measured temperature exceeds the set temperature.

[0008] Based on the above, the rear column body is provided with an axial insertion hole corresponding to each of the PTC heaters, and the PTC heater is detachably plugged into the axial insertion hole.

[0009] Based on the above, the rubber ring groove includes a shallow groove section, a deep groove section and a straight section connected in sequence from front to back. The straight section is flush with the front column body and the rear column body. The depth of the shallow groove section relative to the straight section is 2 mm, and the depth of the deep groove section relative to the straight section is 4 mm. The widths of the shallow groove section and the deep groove section are both 27.5 mm, and the width of the straight section is 20 mm.

[0010] Based on the above, the connection between the front column body and the shallow groove section, the connection between the shallow groove section and the deep groove section, and the connection between the deep groove section and the straight section all have smooth transitions.

[0011] The present invention has substantial features and progress compared to the prior art. Specifically, the present invention has the following advantages:

[0012] (1) By arranging a plurality of PTC heaters in the rear column body, heating can be performed from inside the mold, thereby reducing the temperature difference between the tube and the mold, improving the stability of thin-walled tube molding, and further improving the yield rate.

[0013] (2) The settings of the temperature sensor and the temperature controller can adjust the temperature of the PTC heater to meet the production requirements of pipes of different specifications.

[0014] (3) The setting of the axial socket facilitates the maintenance and replacement of the PTC heater.

[0015] (4) By optimizing the sizes of the shallow groove section, the deep groove section, and the straight section, their shapes are more suitable for the sealing rubber ring of the thin-walled tube, making it less likely to shift, thereby improving the yield rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a production mold for a built-in rubber ring of a PVC water supply pipe in the utility model.

[0017] Figure 2 It is a structural schematic diagram of the rubber ring groove in the utility model.

[0018] Figure 3 This is a control principle block diagram of the PTC heater in the utility model.

[0019] Figure: 1. Conical section; 2. Front column; 3. Rubber ring groove; 4. Rear column; 5. Exhaust pipe; 6. Radial negative pressure hole; 7. PTC heater; 8. Temperature sensor; 31. Shallow groove section; 32. Deep groove section; 33. Straight section. DETAILED DESCRIPTION

[0020] The technical solution of the present utility model is further described in detail below through specific implementation methods.

[0021] like Figure 1-3 As shown, a PVC water supply pipe built-in rubber ring production mold includes a tapered section 1, a front column body 2, a rubber ring groove 3 and a rear column body 4 connected in sequence from front to back. An exhaust pipe 5 is provided at the central axis of the rear column body 4. A plurality of radial negative pressure holes 6 are evenly opened on the rubber ring groove 3. Several of the radial negative pressure holes 6 are connected to the exhaust pipe 5. This part belongs to a common structure in the prior art.

[0022] In order to improve the yield rate of the built-in rubber ring, the PVC water supply pipe built-in rubber ring production mold also includes a plurality of PTC heaters 7 built into the rear column body 4. The plurality of PTC heaters 7 are evenly surrounded by the exhaust pipe 5 to heat the production mold from the inside. The rubber ring groove 3 includes a shallow groove section 31, a deep groove section 32 and a straight section 33 connected in sequence from front to back. The straight section 33 is flush with the front column body 2 and the rear column body 4. The depth of the shallow groove section 31 relative to the straight section 33 is 2 mm, and the depth of the deep groove section 32 relative to the straight section 33 is 4 mm. The widths of the shallow groove section 31 and the deep groove section 32 are both 27.5 mm, and the width of the straight section 33 is 20 mm. The connection between the front column body 2 and the shallow groove section 31, the connection between the shallow groove section 31 and the deep groove section 32, and the connection between the deep groove section 32 and the straight section 33 all have smooth transitions. With this design, the size of the rubber ring groove 3 is more closely aligned with the size of the thin-walled tube sealing rubber ring (built-in rubber ring), and the sealing rubber ring is not easy to move during the plug-in process.

[0023] During specific use, the sealing rubber ring is put on the rubber ring groove 3, the exhaust pipe 5 is connected to an external negative pressure pump to exhaust air, and the PTC heater 7 heats the mold; after the socket of the PVC water supply pipe is heated to the required temperature, the socket of the PVC water supply pipe is put on the production mold. The temperature difference between the pipe and the mold is small. Under the action of negative pressure, the thin-walled tube is more stable. After cooling and shaping, the sealing rubber ring is clamped in the socket of the PVC water supply pipe, and then the production mold is pulled out to complete the production.

[0024] In order to facilitate the adjustment of the heating temperature, the PVC water supply pipe built-in rubber ring production mold also includes a temperature sensor 8 and a thermostat. The temperature sensor 8 monitors the temperature of the production mold and transmits it to the thermostat. The temperature sensor 8 can be specifically embedded in the rear column body 4, close to its surface, to monitor the temperature of the mold surface; the thermostat controls the on and off of the power supply circuit of the PTC heater 7 according to whether the measured temperature exceeds the set temperature to ensure that the temperature is controlled at the set value, which is convenient for finding the appropriate temperature according to pipes of different specifications.

[0025] In order to facilitate maintenance and replacement, the rear column body 4 is respectively provided with an axial insertion hole corresponding to each of the PTC heaters 7 , and the PTC heater 7 is detachably inserted into the axial insertion hole.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and not to limit it; although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents; without departing from the spirit of the technical solution of the utility model, they should all be included in the scope of the technical solution for which protection is requested in the utility model.

Claims

1. A mold for producing built-in rubber rings for PVC water supply pipes, comprising a tapered section, a front column, a rubber ring groove, and a rear column connected in sequence from front to back, an exhaust pipe provided at the central axis of the rear column, a plurality of radial negative pressure holes uniformly formed in the rubber ring groove, and several of the radial negative pressure holes communicating with the exhaust pipe, characterized in that: It also includes a plurality of PTC heaters built into the rear column body, and the plurality of PTC heaters are evenly surrounded around the exhaust pipe to heat the production mold from the inside.

2. The mold for producing built-in rubber rings for PVC water supply pipes according to claim 1, characterized in that: It also includes a temperature sensor and a temperature controller. The temperature sensor monitors the temperature of the production mold and transmits the temperature to the temperature controller. The temperature controller controls the on and off of the PTC heater power supply circuit according to whether the measured temperature exceeds the set temperature.

3. The mold for producing built-in rubber rings for PVC water supply pipes according to claim 2, characterized in that: The rear column body is respectively provided with an axial insertion hole corresponding to each of the PTC heaters, and the PTC heater is detachably plugged into the axial insertion hole.

4. The mold for producing a built-in rubber ring for a PVC water supply pipe according to any one of claims 1 to 3, characterized in that: The rubber ring groove includes a shallow groove section, a deep groove section and a straight section connected in sequence from front to back. The straight section is flush with the front column body and the rear column body. The depth of the shallow groove section relative to the straight section is 2 mm, and the depth of the deep groove section relative to the straight section is 4 mm. The widths of the shallow groove section and the deep groove section are both 27.5 mm, and the width of the straight section is 20 mm.

5. The mold for producing built-in rubber rings for PVC water supply pipes according to claim 4, characterized in that: The connection between the front column body and the shallow groove section, the connection between the shallow groove section and the deep groove section, and the connection between the deep groove section and the straight section all have smooth transitions.

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