Four-station synchronous frequency-adjustable PVC external spiral electrical conduit mold

Abstract

The invention relates to the technical field of molds, in particular to a four-station synchronous frequency-adjustable PVC external spiral electrical conduit mold. Comprising a die body, mouth die main bodies, a core rod main body, a transmission device and a motor, the die body comprises a die body inlet and a plurality of die body outlets, the die body inlet is communicated with a main extrusion opening of an injection molding machine, and each die body outlet is fixedly connected with the mouth die main body; a movable bearing and a rotary special-shaped die are arranged at the end of the extending end of the die body, a main transmission gear is fixedly arranged on the motor, and the transmission device is meshed with the main transmission gear and the rotary special-shaped die at the end of the die body. The main transmission gear and the transmission device drive each rotary special-shaped mouth mold to rotate simultaneously, so that the plurality of rotary special-shaped mouth molds can synchronously rotate at adjustable frequency; according to the mold, multiple cavities can rotate synchronously, the rotating frequency is adjustable, and the electrical casing pipe with external spiral threads or straight stripes can be prepared through shaping of the special-shaped opening mold.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of molds, in particular to a four-station synchronous adjustable frequency PVC outer spiral electrician sleeve mold. BACKGROUND

[0002] PVC electrician sleeve is a kind of insulating electrician sleeve used for electrical equipment line connection, which is mainly used for pipe tool for electrical equipment line connection, and is mainly formed by extrusion molding through electrician sleeve mold and injection molding machine. The PVC electrician sleeve has good insulation performance and strong impact resistance, is not easily damaged by external pressure, and can well protect the internal wire and cable, and is mainly applied in the construction industry or industrial production field. Compared with the ordinary PVC electrician sleeve, the outer spiral PVC electrician sleeve has a spiral structure on the outer wall, and has the advantages of the basic properties of PVC material and the advantages brought by the special structure design. In the concrete underground laying scene, the spiral outer wall can form a stronger mechanical engagement with the concrete, and is not easily loosened or structurally settled by external force impact in the later use process, thereby ensuring the stability of the pipeline. At the same time, the threaded structure of the outer wall facilitates quick disassembly and assembly of the sleeve fittings, and the connection mode is more flexible.

[0003] The patent with the national authorization patent announcement number CN222807570U discloses a PVC electrician sleeve high-efficiency mold device, which comprises a mounting frame, an injection molding machine is fixedly installed on the upper surface of the mounting frame, a connecting column is rotatably installed in the extrusion outlet of the injection molding machine, a sleeve mold is threadedly installed on the outer surface of the extrusion outlet of the injection molding machine, a circulating cooling mechanism is installed in the sleeve mold, the circulating cooling mechanism can conduct the cooling efficiency to the sleeve mold, a cutting mechanism is fixedly installed on the other end of the upper surface of the mounting frame, and the cutting mechanism is connected with the sleeve mold. The extrusion outlet of the injection molding machine is only connected with a single-station mold, and cannot realize multi-station synchronous production, thereby leading to low production efficiency. At the same time, the mold can only produce ordinary PVC electrician sleeves, cannot produce electrician sleeves with special structure design on the outer wall, and does not have the function of synchronous extrusion and synchronous frequency adjustment of the production process of all stations during multi-station production, thereby greatly reducing the functional practicability of the production efficiency of the PVC electrician sleeve. Therefore, a four-station synchronous adjustable frequency PVC outer spiral electrician sleeve mold is needed, which can realize multi-station synchronous production of the PVC outer spiral electrician sleeve, and can also realize synchronous rotation of the adjustable frequency of the thread pitch of the outer spiral of the electrician sleeve on the multi-station. SUMMARY

[0004] The purpose of the present application is to solve the problems in the background art, and to provide a four-station synchronous adjustable frequency PVC outer spiral electrician sleeve mold. The mold can rotate synchronously in multiple cavities, and the rotation frequency is adjustable. Through the shaping of the special-shaped die, an electrician sleeve with an outer spiral thread or a straight strip can be prepared.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: A four-station synchronous frequency-adjustable PVC external spiral electrical casing mold, comprising a mold body, a die body, a core rod body, a transmission device and a motor; The die body includes a die body inlet and a plurality of die body outlets, the die body inlet is connected to the main extrusion port of the injection molding machine, and each die body outlet is fixedly connected to the die body; The die body includes a first die connector, a second die connector, a fixed die and a die fixing seat in sequence, and the mandrel body includes a mandrel and a mandrel bracket, and the mandrel body is arranged inside the die body; A movable bearing and a rotating special-shaped die are provided at the end position of the protruding end of the die body, a main transmission gear is fixedly provided on the motor, and the transmission device is respectively engaged with the main transmission gear and the rotating special-shaped dies at the end of the die body. Through the rotation of the motor, the main transmission gear and the transmission device drive each of the rotating special-shaped dies to rotate simultaneously, thereby realizing the synchronous rotation of the adjustable frequency of the several rotating special-shaped dies.

[0006] Preferably, the mold inlet is connected to two mold main channels inside the mold body, and each of the mold main channels is provided with two mold branch channels, and each of the mold branch channels is connected to a separate mold outlet; a mold inlet is provided on the mold body, and the mold inlet is connected to the main extrusion port of the injection molding machine, and the molten material will enter the mold body from the main extrusion port through the mold inlet, and two mold main channels are provided inside the mold body to connect to the mold inlet, and each of the mold main channels is provided with two mold branch channels. A total of four mold branch channels are provided inside the mold body and are connected to four mold outlets, so that four workstation molds can be installed on the mold body, and multiple external spiral electrical conduits can be produced by one injection molding; compared with traditional single-station molds, the production efficiency is higher, the production cost is significantly reduced, the production flexibility is higher, and it is more suitable for large-scale batch production in enterprises.

[0007] As preferred, the first die connecting body is fixedly installed at the end position of the die body exit end of the die body, the second die connecting body is fixedly connected with the first die connecting body, and the fixed die is arranged on the second die connecting body and fixedly connected with the second die connecting body through the die fixing seat; the first die connecting body is fixedly installed on the die body through threaded connection, the second die connecting body is fixedly installed on the first die connecting body through threaded connection, and the fixed die is finally fixedly installed on the second die connecting body through the die fixing seat, and the die fixing seat and the second die connecting body are fixedly connected through threaded connection; the hierarchical die body design makes the installation and disassembly more convenient and fast, and the replacement of parts of the die body is also more convenient, thereby improving the work efficiency of subsequent production and maintenance of the die.

[0008] As preferred, the first die connecting body is fixedly installed at the end position of the die body exit end of the die body, the second die connecting body is fixedly connected with the first die connecting body, and the fixed die is arranged on the second die connecting body and fixedly connected with the second die connecting body through the die fixing seat; the first die connecting body is fixedly installed on the die body through threaded connection, the second die connecting body is fixedly installed on the first die connecting body through threaded connection, and the fixed die is finally fixedly installed on the second die connecting body through the die fixing seat, and the die fixing seat and the second die connecting body are fixedly connected through threaded connection; the hierarchical die body design makes the installation and disassembly more convenient and fast, and the replacement of parts of the die body is also more convenient, thereby improving the work efficiency of subsequent production and maintenance of the die.

[0009] As preferred, the second die connecting body is internally provided with a core rod accommodating cavity, and the core rod is arranged in the core rod accommodating cavity; a fixed die mounting portion is arranged at the end position of the second die connecting body, the fixed die is mounted on the fixed die mounting portion through the arc-shaped mounting portion at the end portion, and a die extrusion outlet is further arranged in the fixed die; the fixed die is fixedly installed on the fixed die mounting portion of the second die connecting body through the die fixing seat, the fixed die mounting portion is designed in an arc-shaped structure and is mounted on the arc-shaped mounting portion at the end portion of the fixed die, the arc-shaped mounting is adopted to make the die extrusion outlet on the fixed die more convenient to adjust the concentricity with the core rod installed in the core rod accommodating cavity, the concentricity between the two can be adjusted to better ensure that the wall thickness of the produced outer spiral electrical sleeve is more uniform, the roundness is better, and the stability of the product quality is further improved.

[0010] As preferred, the core rod support comprises a support body and a support sleeve, the support sleeve is fixedly connected with the support body through a plurality of arrayed connecting ribs, the support body is provided with a flow guide cone surface at one end towards the die inlet, and is provided with a threaded connection part at the other end for threaded connection with the core rod; the space formed between the support sleeve and the core rod support and the core rod is a die main flow channel, the die main flow channel is in communication with the die inlet and the die extrusion outlet respectively; the core rod support is fixedly installed through the support sleeve and the support mounting part on the first die connecting body, the support sleeve and the support body are fixedly connected through four connecting ribs, and the gap formed between the connecting rib and the support sleeve allows the injection molding melt to pass through, the flow guide cone surface on the support body can make the melt entering the die main body from the die body outlet position more evenly distributed, avoiding the uneven pressure on both sides of the melt due to the too fast flow rate of the melt on one side and the slow flow rate of the melt on the other side, resulting in different cooling speeds of the melt, thereby causing process defects such as surface scratches, depressions or local bubbles of the pipe, and at the same time, the local excessive wear of the mold is reduced, the maintenance cycle and service life of the mold are improved; the die main flow channel in the die main body is in communication with the die body outlet and the die extrusion outlet, the injection molding melt will flow into the die main flow channel after passing through the die body outlet, and under the extrusion pressure of the extruder, the melt will finally pass through the die main flow channel to the die extrusion outlet to form an electrical sleeve.

[0011] As preferred, the core rod is provided with a size control part at the end position of the protruding end, the size between the size control part and the die extrusion outlet is adjusted to realize the wall thickness size adjustment of the extruded pipe, and an adjusting part is further arranged on the end surface of the size control part; the core rod is fixedly installed on the threaded connection part of the core rod support through threaded connection, the end position of the core rod is provided with an adjusting part, the adjusting part is designed in a hexagonal structure, a wrench can be used to adjust the adjusting part of the hexagonal structure, the tightness of the thread can be adjusted to realize the disassembly and assembly of the core rod; the size of the size control part at the end of the core rod can determine the inner diameter size of the extruded electrical sleeve, for the same set of mold, by adjusting the size between the size control part and the die extrusion outlet, electrical sleeves of different wall thickness sizes or inner and outer diameter sizes can be produced without replacing the entire mold, the mold replacement process is simplified, the practicality and production efficiency of the sleeve mold are improved, and it is more suitable for production scenes of multiple specifications and models in batches.

[0012] As preferred, the end of the fixed die mouth extension is provided with a bearing inner ring mounting portion, the inner ring of the movable bearing is fixedly connected on the bearing inner ring mounting portion, the rotating special-shaped die mouth is internally provided with a bearing outer ring mounting portion, and the outer ring of the movable bearing is fixedly connected on the bearing outer ring mounting portion; the rotating special-shaped die mouth is movably mounted on the extension end of the fixed die mouth, and the rotating special-shaped die mouth can be selectively mounted according to production needs, the sleeve pipe die can produce electrician sleeve pipes with outer spiral threads or straight stripes through the rotating special-shaped die mouth, when it is needed to produce electrician sleeve pipes without outer spiral threads or stripes, the rotating special-shaped die mouth only needs to be dismounted from the fixed die mouth, thereby improving the diversity of die production; the PVC electrician sleeve pipe with outer spiral threads or straight stripes has advantages of flexible connection mode and excellent mechanical occlusion capacity, and the structure of outer spiral or straight stripe also equivalently increases the reinforcing rib on the outer wall of the electrician sleeve pipe, thereby further improving the overall strength and compression resistance and impact resistance of the pipe material.

[0013] As preferred, the rotating special-shaped die mouth is designed in a gear structure, a plurality of die teeth are arranged on the outer ring, and the die teeth are engaged with the sprocket on the transmission device; a special-shaped extrusion opening is arranged on the end of the rotating special-shaped die mouth, and a plurality of stripe grooves are further arranged on the inner side wall of the special-shaped extrusion opening; the special-shaped extrusion opening arranged on the rotating special-shaped die mouth is communicated with the die mouth extrusion opening of the fixed die mouth, the melt is finally extruded through the special-shaped extrusion opening after passing through the die mouth extrusion opening, a plurality of stripe grooves are arranged on the special-shaped extrusion opening, when the rotating special-shaped die mouth is stationary, the melt is finally formed into an electrician sleeve pipe with a straight stripe outer wall after passing through the stripe grooves on the special-shaped extrusion opening, when the rotating special-shaped die mouth rotates under the driving of the motor, the melt is finally formed into an electrician sleeve pipe with an outer spiral thread structure under the rotation of the stripe grooves on the special-shaped extrusion opening.

[0014] As preferred, the transmission device is designed in a chain structure, and is engaged with the gear teeth of the main transmission gear and the die teeth of the four rotating special-shaped die mouths, respectively; the main transmission gear is arranged on the output shaft of the motor, and the rotation of the motor drives the main transmission gear and the transmission device to rotate, thereby driving the four rotating special-shaped die mouths engaged with the transmission device to rotate simultaneously; the outer ring of the rotating special-shaped die mouth is provided with die teeth, the transmission device is designed in a chain structure, and simultaneously engages the four rotating special-shaped die mouths and the main transmission gear on the output shaft of the motor; when the motor works, the main transmission gear is driven to rotate, the main transmission gear drives the transmission device to rotate, and the four rotating special-shaped die mouths engaged with the transmission device are also synchronously rotated, thereby achieving the purpose of four-cavity synchronous rotation through one motor transmission, and enabling the four-station die to synchronously produce PVC outer spiral electrician sleeve pipes; meanwhile, through frequency conversion adjustment of the motor rotation speed, an outer product with gradually changed thread pitch can also be produced.

[0015] In summary, the beneficial effects of the present application are: 1. The four-station synchronous adjustable frequency PVC outer spiral electrical conduit mold of the present application has four mold body outlets connected to the mold body at the same time, so that four molds can be installed on the mold body at the same time, and four PVC outer spiral electrical conduits can be produced by one injection molding. Compared with the traditional single-station mold, the electrical conduit mold of the present application has higher production efficiency, lower production cost, and better production flexibility, and is more suitable for large-scale production of enterprises. 2. The four-station synchronous adjustable frequency PVC outer spiral electrical conduit mold of the present application has an arc-shaped mounting portion and a connecting body arc-shaped mounting portion, which makes the concentricity adjustment of the die extrusion outlet on the fixed die and the core rod more simple, reduces the labor intensity of workers during assembly and adjustment, and better ensures the uniformity of the wall thickness and the roundness of the produced outer spiral electrical conduit, greatly improving the stability of product quality. 3. The four-station synchronous adjustable frequency PVC outer spiral electrical conduit mold of the present application has a flow guide cone surface on the core rod support main body, which can make the melt entering the die main flow channel more uniform, avoid the situation that the flow rate of the melt on one side is different from that on the other side, and thus avoid the production of pipe materials with scratches, depressions, or bubbles and other process defects, while reducing the local excessive wear of the mold, improving the maintenance period and service life of the mold. 4. The four-station synchronous adjustable frequency PVC outer spiral electrical conduit mold of the present application has a rotating special-shaped die at the end of the fixed die, and the rotation of the motor can drive the rotating special-shaped die to rotate synchronously. The melt passing through the special-shaped extrusion outlet will be driven by the rotating action of the stripe groove, and finally form an electrical conduit with an outer spiral thread structure on the outer wall. When the rotating special-shaped die does not rotate, it can form an electrical conduit with a straight stripe structure. When the motor speed is adjusted by frequency conversion, the mold of the present application can also produce an outer product with gradually changing thread pitch. 5. The four-station synchronous adjustable frequency PVC outer spiral electrical conduit mold of the present application can selectively install a rotating special-shaped die, and the conduit mold can produce electrical conduits with outer spiral threads or straight stripes through the rotating special-shaped die. When it is necessary to produce electrical conduits without outer threads, the rotating special-shaped die can be disassembled, improving the diversity of mold production. The PVC electrical conduit with outer spiral threads or straight stripes produced by the present application has the advantages of flexible connection method and excellent mechanical engagement ability, and the outer spiral or straight stripe structure also increases the reinforcing ribs on the outer wall of the electrical conduit, further improving the overall strength and impact resistance of the pipe material. 6. The PVC outer spiral electrician sleeve mold with four stations and synchronous adjustable frequency, in the same mold, only by adjusting the size between the size control part and the extrusion port of the die, a plurality of electrician sleeves with different wall thickness or inner diameter sizes can be produced, the whole mold does not need to be replaced, the production time is saved, the mold replacement process is simplified, the practicability and production efficiency of the sleeve mold are improved, and the production scene of batch and multiple specifications is more suitable. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a schematic diagram of the overall structure of the PVC outer spiral electrician sleeve mold with four stations and synchronous adjustable frequency; Figure 2 is a schematic diagram of the internal structure of the PVC outer spiral electrician sleeve mold with four stations and synchronous adjustable frequency; Figure 3 is a schematic diagram of the mold body structure of the PVC outer spiral electrician sleeve mold with four stations and synchronous adjustable frequency; Figure 4 is a schematic diagram of the die body structure of the PVC outer spiral electrician sleeve mold with four stations and synchronous adjustable frequency; Figure 5 is a schematic diagram of the core rod body structure of the PVC outer spiral electrician sleeve mold with four stations and synchronous adjustable frequency; Figure 6 is a schematic diagram of the cooperation structure of the die body and the core rod body of the PVC outer spiral electrician sleeve mold with four stations and synchronous adjustable frequency; Figure 7 is a schematic diagram of the installation structure of the rotary special-shaped die of the PVC outer spiral electrician sleeve mold with four stations and synchronous adjustable frequency; Figure 8 is a schematic diagram of the rotary special-shaped die structure of the PVC outer spiral electrician sleeve mold with four stations and synchronous adjustable frequency; Figure 9 is a schematic diagram of the transmission structure of the transmission device of the PVC outer spiral electrician sleeve mold with four stations and synchronous adjustable frequency.

[0017] Marked in the figure: 10 - die body, 110 - die body inlet, 120 - die body main runner, 130 - die body branch runner, 140 - die body outlet, 150 - die body mating part, 20 - die body, 210 - first die body connecting body, 211 - protruding part, 212 - die body inlet, 213 - support mounting part, 214 - support accommodating cavity, 220 - second die body connecting body, 221 - core rod accommodating cavity, 222 - fixed die body mounting part, 230 - fixed die body, 231 - arc-shaped mounting part, 232 - die body extrusion outlet, 233 - bearing inner ring mounting part, 240 - die body fixing seat, 250 - die body main runner, 260 - rotating special-shaped die body, 261 - bearing outer ring mounting part, 262 - die body tooth, 263 - special-shaped extrusion outlet, 264 - stripe groove, 270 - movable bearing, 30 - core rod body, 310 - core rod, 311 - size control part, 312 - adjusting part, 320 - core rod support, 321 - support body, 322 - support sleeve, 323 - connecting rib, 324 - flow guide conical surface, 325 - threaded connecting part, 40 - transmission device, 50 - motor, 510 - main transmission gear. DETAILED DESCRIPTION

[0018] The following specific examples are merely illustrative of the present application and are not intended to limit the present application. Those skilled in the art can make modifications to the present examples without creative contribution, according to the needs after reading the present specification, and as long as they are within the scope of the claims of the present application, they are protected by the patent law.

[0019] The present application will be described in detail below with examples in combination with the accompanying drawings.

[0020] EXAMPLE

[0021] According to Figure 1 , Figure 2 As shown in the figure, a four-station synchronous adjustable frequency PVC outer spiral electric sleeve die includes a die body 10, a die body 20, a core rod body 30, a transmission device 40 and a motor 50. The die body 10 includes a die body inlet 110 and a plurality of die body outlets 140, the die body inlet 110 is in communication with the main extrusion outlet of the injection molding machine, and each die body outlet 140 is fixedly connected with the die body 20; The die body 20 includes a first die body connecting body 210, a second die body connecting body 220, a fixed die body 230 and a die body fixing seat 240 in sequence, the core rod body 30 includes a core rod 310 and a core rod support 320, and the core rod body 30 is arranged inside the die body 20; The end position of the extending end of the die body 20 is provided with a movable bearing 270 and a rotating special-shaped die 260, and the motor 50 is fixedly provided with a main transmission gear 510, and the transmission device 40 is engaged with the main transmission gear 510 and the rotating special-shaped die 260 at the end of each die body 20, respectively. Through the rotation of the motor 50, the main transmission gear 510 and the transmission device 40 drive each rotating special-shaped die 260 to rotate simultaneously, thereby realizing the synchronous rotation of the adjustable frequency of the rotating special-shaped die 260.

[0022] According to Figure 3 As shown in the drawings, the mold body inlet 110 is communicated with two mold body main flow channels 120 inside the mold body 10, and two mold body branch flow channels 130 are further formed on each mold body main flow channel 120, and each mold body branch flow channel 130 is communicated with a separate mold body outlet 140; the mold body 10 is provided with a mold body inlet 110, which is communicated with the main extrusion outlet of the injection molding machine. The melt enters the inside of the mold body 10 from the main extrusion outlet through the mold body inlet 110. Two mold body main flow channels 120 are formed in the inside of the mold body 10 to communicate with the mold body inlet 110. Two mold body branch flow channels 130 are further formed on each mold body main flow channel 120. Four mold body branch flow channels 130 are formed in the inside of the mold body 10 in total, and are communicated with four mold body outlets 140, so that four-station molds can be installed on the mold body 10, and multiple outer spiral electrical conduit sleeves can be produced in one injection molding.

[0023] According to Figure 2 , Figure 4 As shown in the drawings, the first die connecting body 210 is fixedly installed at the end position of one end of the mold body outlet 140 of the mold body 10, the second die connecting body 220 is fixedly connected with the first die connecting body 210, the fixed die 230 is arranged on the second die connecting body 220 and is fixedly connected with the second die connecting body 220 through the die fixing seat 240; the first die connecting body 210 is fixedly installed on the mold body 10 through threaded connection, the second die connecting body 220 is fixedly installed on the first die connecting body 210 through threaded connection, and the fixed die 230 is finally fixedly installed on the second die connecting body 220 through the die fixing seat 240, and the die fixing seat 240 and the second die connecting body 220 are fixedly connected through threaded connection; the hierarchical die body 20 is designed to be more convenient and fast during installation and disassembly, and more convenient when replacing parts of the die body 20.

[0024] According to Figure 4As shown, a protrusion 211 is provided on the end of the connection end of the first die connector 210 and the die body 10, and the protrusion 211 is installed in cooperation with the die matching portion 150 on the die body outlet 140, and a die inlet 212 is also provided in the protrusion 211 and communicates with the die body outlet 140; a bracket mounting portion 213 is provided on the other end of the first die connector 210, and a bracket accommodating cavity 214 is provided inside, and the core rod bracket 320 is installed on the bracket mounting portion 213 and arranged in the bracket accommodating cavity 214; the die matching portion 150 on the die body outlet 140 is a recessed structure design, and is installed in cooperation with the protrusion 211 on the end face of the first die connector 210, and the protrusion 211 can completely enter the recessed structure inside the die matching portion 150 for male-female cooperation, so that the connection part is better sealed, and the injection molded melt will not flow out from the edge when passing through the die body outlet 140.

[0025] according to Figure 4 、 Figure 6 As shown, a core rod accommodating cavity 221 is provided inside the second die connector 220, and the core rod 310 is provided in the core rod accommodating cavity 221; a fixed die mounting portion 222 is provided at the end position of the second die connector 220, and the fixed die 230 is installed in cooperation with the fixed die mounting portion 222 through the arc-shaped mounting portion 231 at the end, and a die extrusion port 232 is also provided inside the fixed die 230; the fixed die 230 is fixedly mounted on the fixed die mounting portion 222 of the second die connector 220 through the die fixing seat 240, and the fixed die mounting portion 222 is an arc-shaped structure design, and is installed in cooperation with the arc-shaped mounting portion 231 on the end of the fixed die 230. Through the arc-shaped cooperation installation, the concentricity adjustment of the die extrusion port 232 on the fixed die 230 and the core rod 310 installed in the core rod accommodating cavity 221 is more convenient.

[0026] according to Figure 5 、 Figure 6As shown, the mandrel holder 320 includes a holder body 321 and a holder sleeve 322, the holder sleeve 322 is fixedly connected to the holder body 321 through a plurality of connecting ribs 323 arranged in an array, the holder body 321 is provided with a guide cone 324 at one end facing the die inlet 212, and a threaded connection portion 325 is provided at the other end to be threadedly connected and fixed to the mandrel 310; the space formed between the holder accommodating cavity 214 and the mandrel accommodating cavity 221 and the mandrel holder 320 and the mandrel 310 is the die main flow channel 250, and the die main flow channel 250 is connected to the die inlet 212 and the die extrusion port 232 respectively; the mandrel holder 320 is connected to the holder mounting portion 21 on the first die connector 210 through the holder sleeve 322 To facilitate fixed installation, the bracket sleeve 322 is fixedly connected to the bracket body 321 by four connecting ribs 323. A gap is formed between the connecting ribs 323 and the bracket sleeve 322 to allow the injection melt to pass through. The guide cone 324 on the bracket body 321 can make the melt entering the die body 20 from the die body outlet 140 more evenly distributed. The die main channel 250 inside the die body 20 connects the die body outlet 140 and the die extrusion port 232. After passing through the die body outlet 140, the injection melt enters the die main channel 250 and flows. Under the extrusion pressure of the extruder, the melt eventually passes through the die main channel 250 to reach the die extrusion port 232 and is formed into an electrical sleeve.

[0027] according to Figure 5 、 Figure 6 As shown, a size control part 311 is provided at the end position of the protruding end of the core rod 310. By adjusting the size between the size control part 311 and the die extrusion port 232, the wall thickness size of the extruded pipe can be adjusted. An adjustment part 312 is also provided on the end surface of the size control part 311; the core rod 310 is fixedly mounted on the threaded connection part 325 of the core rod bracket 320 through a threaded connection, and an adjustment part 312 is provided at the end position of the core rod 310. The adjustment part 312 is a hexagonal structure design. The hexagonal structure adjustment part 312 can be adjusted with a wrench to adjust the tightness of the thread, thereby realizing the disassembly and assembly of the core rod 310; the size design of the size control part 311 at the end of the core rod 310 can determine the inner diameter size of the extruded electrical conduit. By adjusting the size between the size control part 311 and the die extrusion port 232, the same set of molds can produce electrical conduits with different wall thickness sizes or inner and outer diameter sizes.

[0028] according to Figure 7As shown, a bearing inner ring mounting portion 233 is provided on the end of the protruding end of the fixed die 230, and the inner ring of the movable bearing 270 is fixedly connected to the bearing inner ring mounting portion 233. A bearing outer ring mounting portion 261 is provided inside the rotating special-shaped die 260, and the outer ring of the movable bearing 270 is fixedly connected to the bearing outer ring mounting portion 261; the rotating special-shaped die 260 is movably mounted on the protruding end of the fixed die 230 through the movable bearing 270. The rotating special-shaped die 260 can be selectively installed according to production needs. The sleeve mold can produce electrical sleeves with external spiral threads or straight stripes through the rotating special-shaped die 260. When it is necessary to produce electrical sleeves without external spirals or stripes, it is only necessary to remove the rotating special-shaped die 260 from the fixed die 230, thereby improving the diversity of mold production.

[0029] according to Figure 2 、 Figure 8 As shown, the rotating special-shaped die 260 is designed as a gear structure, and a plurality of die teeth 262 are provided on the outer ring, and the die teeth 262 are engaged with the sprocket on the transmission device 40; a special-shaped extrusion port 263 is provided on the end of the rotating special-shaped die 260, and a plurality of stripe grooves 264 are arranged in an array on the inner side wall of the special-shaped extrusion port 263; the special-shaped extrusion port 263 provided on the rotating special-shaped die 260 is connected to the die extrusion port 232 of the fixed die 230, and the molten material will eventually pass through the special-shaped extrusion port 232 after passing through the die extrusion port 232. The shaped extrusion port 263 is extruded, and a plurality of striped grooves 264 are provided on the shaped extrusion port 263. When the rotating shaped die 260 is stationary, the molten material passes through the striped grooves 264 on the shaped extrusion port 263 and is eventually formed into an electrical conduit with an outer wall having straight stripes. When the rotating shaped die 260 is driven by the motor to rotate, the molten material passes through the striped grooves 264 on the shaped extrusion port 263 and is eventually formed into an electrical conduit with an outer wall having an external spiral thread structure under the rotation of the striped grooves 264.

[0030] according to Figure 9As shown, the transmission device 40 is a chain structure, respectively with the gear teeth of the main transmission gear 510 and the die teeth 262 of the four rotating special-shaped die 260 meshing, the main transmission gear 510 is arranged on the output shaft of the motor 50, the rotation of the motor 50 drives the main transmission gear 510 and the transmission device 40 to rotate, thereby driving the four rotating special-shaped die 260 meshing with the transmission device 40 to rotate simultaneously; The outer ring of the rotating special-shaped die 260 is provided with the die teeth 262, the transmission device 40 is designed as a chain structure, and simultaneously meshes with the four rotating special-shaped die 260 and the main transmission gear 510 on the output shaft of the motor 50, when the motor 50 works, it drives the main transmission gear 510 to rotate, the main transmission gear 510 will drive the transmission device to rotate together, the four rotating special-shaped die 260 meshing on the transmission device 40 will also rotate synchronously, realizing the purpose of four-cavity synchronous rotation through one motor 50 transmission, so that the four-station die can synchronously produce the PVC outer spiral electrician sleeve; At the same time, through frequency conversion adjustment of the motor 50 rotating speed, the outer product with gradually changing thread pitch can also be produced.

Claims

1. A four-station simultaneous adjustable frequency PVC outer spiral electrical conduit mold characterized in that, It comprises a die body (10), a die body (20), a core rod body (30), a transmission device (40) and a motor (50); The die body (10) comprises a die body inlet (110) and a plurality of die body outlets (140). The die body inlet (110) is in communication with the main extrusion port of the injection molding machine. Each die body outlet (140) is fixedly connected with the die body (20). The die body (20) comprises a first die body connector (210), a second die body connector (220), a fixed die (230) and a die fixing seat (240). The core rod body (30) comprises a core rod (310) and a core rod support (320). The core rod body (30) is arranged inside the die body (20). The end position of the die body (20) is provided with a movable bearing (270) and a rotating special-shaped die (260). The motor (50) is fixedly provided with a main transmission gear (510). The transmission device (40) is engaged with the main transmission gear (510) and the rotating special-shaped die (260) at the end of the die body (20). Through the rotation of the motor (50), the main transmission gear (510) and the transmission device (40) drive each rotating special-shaped die (260) to rotate simultaneously, thereby realizing the synchronous rotation of the rotating special-shaped die (260) with adjustable frequency.

2. A four-station simultaneous adjustable frequency PVC outer spiral electrical conduit mold according to claim 1, characterized in that, The die body inlet (110) is in communication with two die body main flow channels (120) inside the die body (10). Each die body main flow channel (120) is also provided with two die body branch flow channels (130). Each die body branch flow channel (130) is in communication with a separate die body outlet (140).

3. A four station simultaneous adjustable frequency PVC outer spiral electrical conduit mold in accordance with claim 1, wherein, The first die body connector (210) is fixedly installed at the end position of the die body outlet (140) of the die body (10). The second die body connector (220) is fixedly connected with the first die body connector (210). The fixed die (230) is arranged on the second die body connector (220) and fixedly connected with the second die body connector (220) through the die fixing seat (240).

4. A four-station simultaneous adjustable frequency PVC outer spiral electrical conduit mold in accordance with claim 1, wherein, The first die body connector (210) is provided with a protruding part (211) at the end of the die body (10) connection end. The protruding part (211) is matched and installed with the die body outlet (140) and the die body outlet (140) is in communication with the die inlet (212) arranged in the protruding part (211). The other end of the first die body connector (210) is provided with a support mounting part (213) and a support containing cavity (214) is arranged inside the support mounting part (213). The core rod support (320) is installed on the support mounting part (213) and arranged in the support containing cavity (214).

5. A four station simultaneous adjustable frequency PVC outer spiral electrical conduit mold in accordance with claim 4, wherein, The second die connecting body (220) is internally provided with a mandrel accommodating cavity (221), and the mandrel (310) is arranged in the mandrel accommodating cavity (221); a fixed die mounting portion (222) is arranged at an end position of the second die connecting body (220), the fixed die (230) is mounted in cooperation with the fixed die mounting portion (222) through an arc-shaped mounting portion (231) at an end, and the fixed die (230) is further internally provided with a die extrusion outlet (232).

6. A four-station simultaneous adjustable frequency PVC outer spiral electrical conduit mold in accordance with claim 5, wherein, The mandrel support (320) comprises a support main body (321) and a support sleeve (322), the support sleeve (322) is fixedly connected with the support main body (321) through a plurality of arrayed connecting ribs (323), a flow guide conical surface (324) is arranged at one end of the support main body (321) towards the die inlet (212), and a threaded connecting portion (325) is arranged at the other end and is threadedly connected with the mandrel (310); a space formed between the support accommodating cavity (214), the mandrel accommodating cavity (221), the mandrel support (320) and the mandrel (310) is a die main flow channel (250), and the die main flow channel (250) is in communication with the die inlet (212) and the die extrusion outlet (232) respectively.

7. A four-station simultaneous adjustable frequency PVC outer spiral electrical conduit mold according to claim 6, characterized in that, A size control portion (311) is arranged at an end position of an extending end of the mandrel (310), the size between the size control portion (311) and the die extrusion outlet (232) is adjusted, so that the wall thickness size of an extrusion pipe is adjusted, and an adjusting portion (312) is further arranged on an end face of the size control portion (311).

8. A four-station simultaneous adjustable frequency PVC outer spiral electrical conduit mold in accordance with claim 1, wherein, A bearing inner ring mounting portion (233) is arranged at an end of an extending end of the fixed die (230), an inner ring of the movable bearing (270) is fixedly connected on the bearing inner ring mounting portion (233), a bearing outer ring mounting portion (261) is arranged internally in the rotating special-shaped die (260), and an outer ring of the movable bearing (270) is fixedly connected on the bearing outer ring mounting portion (261).

9. A four-station simultaneous adjustable frequency PVC outer spiral electrical conduit mold in accordance with claim 1, wherein, The rotating special-shaped die (260) is designed in a gear structure, a plurality of die teeth (262) are arranged on an outer ring, the die teeth (262) are engaged with sprocket wheels on the transmission device (40), a special-shaped extrusion outlet (263) is arranged at an end of the rotating special-shaped die (260), and a plurality of stripe grooves (264) are further arrayed and formed on an inner side wall of the special-shaped extrusion outlet (263).

10. A four-station simultaneous adjustable frequency PVC outer spiral electrical conduit mold in accordance with claim 9, wherein, The transmission device (40) is a chain structure, is engaged with gear teeth of the main transmission gear (510) and the die teeth (262) of the four rotating special-shaped dies (260) respectively, the main transmission gear (510) is arranged on an output shaft of the motor (50), rotation of the motor (50) drives the main transmission gear (510) and the transmission device (40) to rotate, so as to simultaneously drive the four rotating special-shaped dies (260) engaged with the transmission device (40) to rotate.

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