An injection mold for injection molding a plastic sheet for a wiring terminal

Abstract

The utility model relates to fine spare processing equipment technical field, concretely refers to a kind of injection mould of terminal injection moulding plastic sheet, including base, first drive component, thimble, heat shield, heat insulation roller and second drive component, base is provided with guide rod, guide rod is provided with lower die holder and upper die holder;First drive component is arranged in base and drives and connects lower die holder;Thimble is arranged in base and is inserted into lower die holder;Heat shield is arranged in lower die holder, and heat shield is provided with first heat-conducting plate;Heat insulation roller is arranged in heat shield, and heat insulation roller is symmetrically provided with two intercommunicating serpentine channels and second side window, second side window is provided with second heat-conducting plate, and the two ends of two serpentine channels are respectively connected with swivel joint;Second drive component is arranged on lower die holder.The utility model realizes the rapid cooling and preheating of mould by switching heat-conducting plate, realizes the two-way regulation and control of accurate preheating and rapid cooling, and the structure is stable and the degree of automation is high.

Description

Technical Field

[0001] This utility model relates to the field of precision parts processing equipment, specifically to an injection mold for injection molding thin plastic sheets for terminal blocks. Background Technology

[0002] As a core component of electrical connections, the plastic housing of terminal blocks needs to be mass-produced using injection molds, and the requirements for molding precision, surface quality and internal density are extremely high. If the plastic housing has defects such as bubbles or shrinkage cavities, it will directly affect the insulation performance and structural strength of the terminal block, and may even cause electrical safety hazards.

[0003] Existing injection molds mostly use a single serpentine channel and low-temperature coolant for heat exchange, which can only achieve the function of cooling after injection. In continuous production, the temperature of the mold cavity can drop sharply to 30-50℃ after a single demolding, while the temperature of the molten plastic injected in the next injection is as high as 200-250℃. The huge temperature difference causes the plastic melt to cool and shrink rapidly on the inner wall of the cavity, forming a defect of "surface solidification and incomplete filling of the interior", or air bubbles and cavities due to the inability of gas to be discharged in time. As a result, the pass rate of plastic sheets for terminal blocks can only be maintained at about 85%, which is difficult to meet the requirements of high-precision production. Traditional molds typically employ linear or simple curved heat exchange channels, resulting in limited contact area with the mold cavity. Furthermore, they lack effective insulation and, during cooling, heat not only transfers to the cavity but also diffuses into unnecessary areas such as the base and guide rods, leading to low coolant heat absorption efficiency. This results in a 30-40 second waiting period after each injection molding cycle before demolding. Simultaneously, mold preheating relies on natural heating or external heating plates, taking 5-10 minutes, severely restricting production cycle time to only 80-100 mold cycles per hour, failing to meet the demands of large-scale mass production. Additionally, some molds use multiple guide pillars to improve mold closing accuracy, but misalignment between the lower mold base drive mechanism (such as hydraulic or pneumatic cylinders) and the guide pillar axis is prone to occur, causing cavity misalignment during mold closing and requiring frequent manual calibration. Moreover, rotary joints, as key components of the heat exchange channel, are mostly single-channel designs in existing products. Switching between hot and cold fluids requires disassembling the pipeline, which is cumbersome and prone to leaks. Maintenance requires 2-3 hours of downtime, further reducing production efficiency. Mold temperature monitoring often relies on manual handheld thermometers to detect the surface temperature of the cavity, which has problems such as detection lag and large data errors. Heat conduction switching requires manual judgment of the timing and manual control of the motor, which not only increases the labor intensity of operators, but may also lead to excessively high or low mold temperatures due to misjudgment, further aggravating molding defects. Utility Model Content

[0004] The purpose of this invention is to provide an injection mold for injection molding thin plastic sheets for terminal blocks that can achieve bidirectional control of precise preheating and rapid cooling, has a stable structure, and a high degree of automation.

[0005] This utility model is achieved through the following technical solution: an injection mold for injection molding plastic sheets for wiring terminals, comprising: A base, on which several guide rods extending vertically are fixedly installed, and a lower mold base that can slide along its axial direction is sleeved on the guide rods. The end of the guide rod away from the base is fixedly connected to the upper mold base, and the lower mold base and the upper mold base are correspondingly arranged to form a closed mold cavity. The first drive assembly is mounted on the base and its output end is connected to the lower mold base for driving the lower mold base away from or closer to the upper mold base along the axial direction of the guide rod. Ejector pins, several sets of ejector pins are fixedly mounted on the base, and each set of ejector pins slides vertically into the lower mold base. The ejector pins are used to eject the molded part from the mold cavity when the mold is opened. A heat insulation sleeve is embedded in the lower mold base and fits tightly against the inner wall of the lower mold base. A first heat-conducting plate is fixedly installed on the outer wall of the heat insulation sleeve. The first heat-conducting plate fits tightly against the inner wall of the mounting cavity of the lower mold base and is used to transfer heat to regulate the temperature of the lower mold base. A heat-insulating roller is rotatably mounted inside a heat-insulating sleeve via bearings, and the heat-insulating roller and the heat-insulating sleeve are arranged coaxially. Two independent serpentine channels are symmetrically opened inside the heat-insulating roller. A second side window is opened on the side wall of the heat-insulating roller corresponding to the two serpentine channels. The two second side windows are respectively connected to the serpentine channels on the corresponding sides. A second heat-conducting plate is fixedly installed at the opening of each second side window. The second heat-conducting plate is tightly fitted to the inner wall of the heat-insulating sleeve and the inner wall of the first heat-conducting plate. A rotary joint is connected to each end of the two serpentine channels. The rotary joint is used to connect the serpentine channels to external pipelines. The second drive assembly is fixedly mounted on the lower mold base and its output end is connected to the heat insulation roller drive to drive the heat insulation roller to rotate around its own axis so that the two second heat-conducting plates alternately contact the first heat-conducting plate and exchange heat.

[0006] The working principle of this technical solution is as follows: the guide rod ensures the accuracy of mold closing between the lower mold base and the upper mold base, and the first drive component realizes stable mold opening and closing; cold water and hot water are introduced through the dual independent serpentine channels of the heat insulation roller respectively, and the second drive component drives the heat insulation roller to rotate, so that the two second heat conduction plates alternately contact the first heat conduction plate, realizing bidirectional temperature control of mold preheating and cooling. At the same time, the heat insulation sleeve reduces heat loss to the outside, ensuring temperature control efficiency.

[0007] To better realize this utility model, the top surface of the lower mold base is further provided with a plurality of lower mold cavities for molding plastic sheets for terminal blocks, and the top surface of the upper mold base is provided with injection holes. The lower end of the injection holes penetrates the upper mold base and communicates with each lower mold cavity, for injecting molten plastic into all lower mold cavities. When the lower mold base and the upper mold base are in a closed molded state, the top end face of the ejector pin is flush with the bottom surface of the lower mold cavity to ensure that the bottom surface of the lower mold cavity is flat and avoid affecting the bottom surface accuracy of the molded part.

[0008] To better realize this utility model, the rotary joint further includes a disc-shaped joint body. The joint body has a first annular cavity and a second annular cavity coaxially formed inside, and the first annular cavity and the second annular cavity are independent of each other. A first annular cover is rotatably mounted on the joint body at the opening corresponding to the first annular cavity via a rotary seal. A first guide tube is fixedly connected to the first annular cover, with one end of the first guide tube communicating with the first annular cavity and the other end sealed and connected to one end of the corresponding side serpentine channel. A second annular cover is rotatably mounted on the joint body at the opening corresponding to the second annular cavity via a rotary seal. A second guide tube is fixedly connected to the second annular cover, with one end communicating with the second annular cavity and the other end sealed and connected to the other end of the corresponding side serpentine channel. A first return pipe and a second return pipe are also fixedly connected to the side wall of the joint body. One end of the first return pipe communicates with the first annular cavity, and the other end is used to connect to an external return pipe. One end of the second return pipe communicates with the second annular cavity, and the other end is used to connect to an external return pipe.

[0009] To better realize this utility model, the first driving component further includes a cylinder, the cylinder body of which is fixedly connected to the base by bolts, the top end of the piston rod of which is fixedly connected to the bottom surface of the lower mold base by a flange, and the axis of the cylinder is parallel to the axis of the guide rod, for driving the lower mold base to slide stably along the guide rod.

[0010] To better realize this utility model, the second drive component further includes a motor, a first gear, and a second gear. The second gear is coaxially and fixedly connected to one end of the heat insulation roller via a key connection. The first gear is rotatably mounted on the side wall of the lower mold base via a bearing, and the first gear and the second gear mesh with each other to form a gear transmission mechanism. The motor base is fixedly mounted on the lower mold base by bolts, and the output shaft of the motor is fixedly connected to the mounting shaft of the first gear via a coupling to drive the first gear to rotate, thereby driving the heat insulation roller to rotate around its own axis via the second gear.

[0011] To better realize this utility model, it further includes a controller for controlling the operating parameters of the motor. The motor is a servo motor. The signal input terminal of the servo motor is electrically connected to the signal output terminal of the controller through a wire. The controller is used to control the speed, direction and start / stop of the servo motor to achieve precise control of the rotation angle and rotation speed of the heat insulation roller, thereby ensuring the accuracy of the alternating heat exchange between the two second heat-conducting plates and the first heat-conducting plate.

[0012] To better realize this utility model, a temperature sensor is further fixedly installed on the side wall of the lower mold base, and the detection end of the temperature sensor extends to the inner wall of the lower mold cavity; the temperature sensor is electrically connected to the controller, the controller receives the detection signal of the temperature sensor, and automatically controls the second drive assembly to drive the heat insulation roller to rotate according to the detected temperature of the lower mold cavity, so as to switch the contact between the second heat-conducting plate and the first heat-conducting plate at different temperatures.

[0013] To better realize this utility model, the side wall of the heat insulation sleeve is further provided with a first side window corresponding to the movement trajectory of the two second heat-conducting plates. There are two first side windows arranged symmetrically. The size of each first side window is adapted to the size of the second heat-conducting plate. When the second heat-conducting plate rotates under the drive of the heat insulation roller, it can make close contact with the first heat-conducting plate through the first side window. An elastic sealing gasket is provided at the edge of the first side window.

[0014] Compared with the prior art, this utility model has the following advantages and beneficial effects: (1) This utility model uses two independent serpentine channels symmetrically arranged inside the heat insulation roller to allow hot water and cold water to be introduced respectively. With the help of the second drive component, the heat insulation roller is driven to rotate, so that the two second heat-conducting plates alternately contact the first heat-conducting plate. This allows the second heat-conducting plate, which is supplied with hot water before injection, to preheat the mold cavity and avoid the molten plastic from contacting the low-temperature cavity and generating bubbles. After injection, the second heat-conducting plate is switched to supplying cold water, which can quickly cool the cavity and ensure that the plastic part is quickly solidified and internally dense. (2) Compared with traditional molds, this utility model can shorten the cooling time. The entire preheating process does not rely on external heating plates. Hot water can be introduced through a serpentine channel to achieve rapid preheating. The temperature sensor detects the temperature of the lower mold cavity in real time and transmits the signal to the controller. The controller can automatically trigger the second drive component to switch the second heat conduction plate without manual judgment of temperature and operation. Moreover, the servo motor and the controller can achieve precise rotation of the heat insulation roller, avoiding switching errors caused by manual operation. (3) In this utility model, the axis of the first drive component is parallel to the axis of the guide rod, and the lower mold base is slidably guided by the guide rod, so that the mold cavity is accurately closed and the plastic parts are avoided due to misalignment; the second drive component adopts gear meshing transmission and is connected to the key-connected heat insulation roller, which has high transmission efficiency and no risk of slippage, ensuring that the heat insulation roller rotates stably for a long time. (4) In this utility model, the rotary joint adopts two independent annular cavities, and the second annular cavity corresponds to the liquid inlet and liquid return of the serpentine channel respectively, so as to avoid the mixing of hot and cold fluids; the annular cover is connected to the joint body through a rotary seal, so there is no fluid leakage when rotating, and the switching of hot and cold fluids can be realized without disassembling the pipeline, which shortens the maintenance time and reduces the maintenance cost. (5) In this utility model, the lower mold base can be opened with multiple lower mold cavities, and the injection hole of the upper mold base is connected to all the lower mold cavities, which can realize the injection molding of multiple products in a single injection, further improving the efficiency of mass production; at the same time, the size of the lower mold cavity can be adjusted according to different specifications of terminal plastic sheets, and the mold has strong versatility. Attached Figure Description

[0015] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the connection structure between the heat insulation sleeve and the heat insulation roller in this utility model; Figure 3 This is a schematic diagram of the connection structure of the various components on the heat insulation roller in this utility model. Figure 4 This is a schematic diagram of the connection structure of the double heat-insulating rollers in this utility model.

[0016] Wherein: 1—base, 2—guide rod, 3—lower mold base, 301—lower mold cavity, 4—upper mold base, 401—injection hole, 5—first drive assembly, 6—ejector pin, 7—heat insulation sleeve, 701—first side window, 8—first heat conduction plate, 9—heat insulation roller, 901—serpentine channel, 902—second side window, 10—second heat conduction plate, 11—rotary joint, 111—first annular cavity, 112—second annular cavity, 12—first return pipe, 13—second return pipe, 14—second drive assembly. Detailed Implementation

[0017] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0018] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly including one or more of the feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0019] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] Example 1: The main structure of this embodiment is as follows: Figures 1-4 As shown, it includes: A base 1, on which several guide rods 2 extending vertically are fixedly installed, and a lower mold base 3 that can slide along its axial direction is sleeved on the guide rods 2. The end of the guide rod 2 away from the base 1 is fixedly connected to the upper mold base 4, and the lower mold base 3 and the upper mold base 4 are correspondingly arranged to form a closed mold cavity. The first driving component 5 is disposed on the base 1 and its output end is connected to the lower mold base 3 for driving the lower mold base 3 away from or close to the upper mold base 4 along the axial direction of the guide rod 2. Ejector pins 6, several sets of ejector pins 6 are fixedly mounted on the base 1, and each set of ejector pins 6 is slidably inserted into the lower mold base 3 in the vertical direction. The ejector pins 6 are used to eject the molded parts in the mold cavity when the mold is opened. A heat insulation sleeve 7 is embedded in the lower mold base 3 and closely fits the inner wall of the lower mold base 3. A first heat-conducting plate 8 is fixedly provided on the outer wall of the heat insulation sleeve 7. The first heat-conducting plate 8 is closely fitted with the inner wall of the mounting cavity of the lower mold base 3 and is used to transfer heat to regulate the temperature of the lower mold base 3. A heat-insulating roller 9 is rotatably mounted inside a heat-insulating sleeve 7 via bearings, and the heat-insulating roller 9 and the heat-insulating sleeve 7 are arranged coaxially. Two independent serpentine channels 901 are symmetrically opened inside the heat-insulating roller 9. A second side window 902 is opened on the side wall of the heat-insulating roller 9 corresponding to the two serpentine channels 901. The two second side windows 902 are respectively connected to the serpentine channels 901 on the corresponding side. A second heat-conducting plate 10 is fixedly installed at the opening of each second side window 902. The second heat-conducting plate 10 is tightly fitted to the inner wall of the heat-insulating sleeve 7 and the inner wall of the first heat-conducting plate 8. A rotary joint 11 is connected to each end of the two serpentine channels 901. The rotary joint 11 is used to connect the serpentine channels 901 to the external pipeline. And a second drive assembly 14, which is fixedly mounted on the lower mold base 3 and whose output end is connected to the heat insulation roller 9 for driving the heat insulation roller 9 to rotate around its own axis so that the two second heat-conducting plates 10 alternately contact the first heat-conducting plate 8 and exchange heat.

[0021] The specific implementation method is as follows: Several guide rods 2 extending vertically are fixed to the base 1 with bolts; a lower mold base 3 is fitted onto the guide rods 2, ensuring it can slide axially along the guide rods 2; an upper mold base 4 is fixed to the end of the guide rods 2 away from the base 1, so that the lower mold base 3 corresponds to the upper mold base 4, forming a closed mold cavity when the mold is closed; a first drive assembly 5 is installed on the base 1, with its output end connected to the lower mold base 3; several sets of ejector pins 6 are fixed to the base 1 and slidably inserted into the lower mold base 3 in the vertical direction; a heat insulation sleeve 7 with a first heat-conducting plate 8 embedded is installed into the lower mold base 3, ensuring that the heat insulation sleeve 7 is flush with the inner wall of the lower mold base 3 and the first heat-conducting plate 8. The heat-conducting plate 8 and the inner wall of the mounting cavity of the lower mold base 3 are tightly fitted together; the heat-insulating roller 9 with dual independent serpentine channels 901 is installed in the heat-insulating sleeve 7 through bearings to ensure that the two are coaxial; the second heat-conducting plate 10 is installed on the side wall of the heat-insulating roller 9 at the position corresponding to the serpentine channel 901, so that the second heat-conducting plate 10 is fitted with the inner wall of the heat-insulating sleeve 7 and the inner wall of the first heat-conducting plate 8; the two rotary joints 11 are respectively connected to the two ends of the serpentine channel 901 to ensure that the rotary joints 11 can realize the connection between the serpentine channel 901 and the external cold and hot water pipes; finally, the second drive assembly 14 is fixed on the lower mold base 3 so that its output end is connected to the heat-insulating roller 9 for transmission.

[0022] Start the first drive assembly 5 to drive the lower mold base 3 to slide up and down along the guide rod 2 axis and check the sealing performance when the lower mold base 3 and the upper mold base 4 are closed; start the second drive assembly 14 to drive the heat insulation roller 9 to rotate around its own axis and observe whether the two second heat conduction plates 10 can smoothly alternately contact the first heat conduction plate 8; introduce a small amount of cold water and hot water into the two serpentine channels 901 through the rotary joint 11 to check whether there is any leakage in the pipeline.

[0023] Example 2: This embodiment, based on the above embodiment, further defines the structure of the lower mold base 3 and the upper mold base 4, such as... Figure 1 As shown, the top surface of the lower mold base 3 is provided with a plurality of lower mold cavities 301 for molding plastic sheets for terminal blocks, and the top surface of the upper mold base 4 is provided with injection holes 401. The lower end of the injection holes 401 penetrates the upper mold base 4 and is connected to each lower mold cavity 301, for injecting molten plastic into all lower mold cavities 301. When the lower mold base 3 and the upper mold base 4 are in a closed mold state, the top end face of the ejector pin 6 is flush with the bottom surface of the lower mold cavity 301 to ensure that the bottom surface of the lower mold cavity 301 is flat and avoids affecting the bottom surface accuracy of the molded part. The design adopts a single injection hole and multiple mold cavities. The injection hole 401 passes through the upper mold base 4 and connects with all the lower mold cavities 301, ensuring that the molten plastic is evenly distributed to each lower mold cavity 301 under pressure. Secondly, in the mold-closed state, the top end face of the ejector pin 6 is flush with the bottom surface of the lower mold cavity 301, avoiding the ejector pin 6 from protruding and causing marks on the bottom surface of the molded part. At the same time, it provides stable support for the demolding action when the mold is opened.

[0024] The specific implementation process is as follows: several lower mold cavities 301 for molding plastic sheets for terminals are machined on the top surface of the lower mold base 3. The size and shape of the lower mold cavities 301 match the target plastic sheets for terminals. Injection holes 401 are opened on the top surface of the upper mold base 4, so that the lower end of the injection hole 401 passes through the upper mold base 4 and is connected to the opening of each lower mold cavity 301, ensuring that molten plastic can flow into all lower mold cavities 301 simultaneously through the injection hole 401. The height of the ejector pin 6 fixed on the base 1 is adjusted, and the first drive assembly 5 is activated to drive the lower mold base 3 to move upward until it is completely sealed with the upper mold base 4. Close the mold. At this time, use a depth gauge to check the flatness of the top face of the ejector pin 6 and the bottom surface of the lower mold cavity 301 to ensure that they are flush and fit together. If there is a deviation, adjust the fixed position of the ejector pin 6 on the base 1 to achieve calibration. Connect the injection hole 401 of the upper mold base 4 to the outlet of the injection molding machine, start the injection molding machine, and inject a small amount of molten plastic into the injection hole 401. Observe whether the molten plastic is evenly filled into each lower mold cavity 301. If a certain lower mold cavity 301 is not filled enough, check whether the connecting channel between the injection hole 401 and the lower mold cavity 301 is blocked. If necessary, grind and clear the channel. The other parts of this embodiment are the same as those in the above embodiment and will not be repeated.

[0025] Example 3: This embodiment further defines the structure of the rotary joint 11 based on the above embodiments, such as... Figure 3As shown, the rotary joint 11 includes a disc-shaped joint body. A first annular cavity 111 and a second annular cavity 112 are coaxially formed inside the joint body, and the first annular cavity 111 and the second annular cavity 112 are independent of each other. A first annular cover is rotatably mounted on the joint body corresponding to the opening of the first annular cavity 111 via a rotary seal. A first guide tube is fixedly connected to the first annular cover. One end of the first guide tube communicates with the first annular cavity 111, and the other end is sealed and communicated with one end of the corresponding side serpentine channel 901. The joint body corresponding to the second annular cavity 11... A second annular cover is rotatably provided at the opening of 2 via a rotary seal. A second guide tube is fixedly connected to the second annular cover. One end of the second guide tube is connected to the second annular cavity 112, and the other end is sealed and connected to the other end of the corresponding side serpentine channel 901. A first return pipe 12 and a second return pipe 13 are also fixedly connected to the side wall of the connector body. One end of the first return pipe 12 is connected to the first annular cavity 111, and the other end is used to connect to an external return pipe. One end of the second return pipe 13 is connected to the second annular cavity 112, and the other end is used to connect to an external return pipe. The first annular cavity 111 and the second annular cavity 112 are coaxial and independent within the connector body, respectively corresponding to the inlet and outlet of the serpentine channel 901, thus preventing the mixing of hot and cold fluids inside the connector. The first annular cover, the second annular cover and the connector body are rotated and sealed by a rotary seal, ensuring that when the heat insulation roller 9 rotates, the first guide pipe and the second guide pipe rotate synchronously with the heat insulation roller 9, while the connector body and the first return pipe 12 and the second return pipe 13 are fixed, which ensures stable fluid conduction and prevents fluid leakage.

[0026] The specific implementation process is as follows: the first annular cavity 111 and the second annular cavity 112 are coaxially machined in the disc-shaped connector body to ensure that the two cavities are completely independent and have no connecting gaps; rotating seals are installed at the openings of the connector body corresponding to the first annular cavity 111 and the second annular cavity 112, respectively; and the first annular cover and the second annular cover are respectively fitted onto the rotating seals to ensure that the annular cover can rotate smoothly around the axis of the connector body without leakage. One end of the first guide pipe is welded and fixed to the first annular cover, and the other end is connected to one end of the corresponding serpentine channel 901 on the heat insulation roller 9 through a sealing joint to ensure that the two are sealed and connected. One end of the second guide pipe is welded and fixed to the second annular cover, and the other end is connected to the other end of the same serpentine channel 901 through a sealing joint. The first return pipe 12 and the second return pipe 13 are welded to the side wall of the joint body respectively, so that the first return pipe 12 is connected to the first annular cavity 111 and the second return pipe 13 is connected to the second annular cavity 112. Finally, the first return pipe 12 and the second return pipe 13 are connected to the external cold and hot water return pipes respectively. Colored water is introduced into one set of serpentine channels 901. The second drive assembly 14 is activated to drive the heat-insulating roller 9 to rotate. Observe whether there is water leakage at the connection between the annular cap and the main body of the rotary joint 11, and at the connection between the guide pipe and the serpentine channel. Simultaneously observe the liquid discharge from the first return pipe 12 and the second return pipe 13 to ensure that the liquid can smoothly circulate through the annular cavity, guide pipe, and serpentine channel without color mixing. To test another set of serpentine channels, simply use a different colored liquid. Other parts of this embodiment are the same as those in the above embodiment and will not be repeated.

[0027] Example 4: This embodiment, based on the above embodiments, further defines the structure of the first driving component 5. The first driving component 5 includes a cylinder. The cylinder body is fixedly connected to the base 1 by bolts. The top end of the piston rod of the cylinder is fixedly connected to the bottom surface of the lower mold base 3 through a flange. The axis of the cylinder is parallel to the axis of the guide rod 2, and is used to drive the lower mold base 3 to slide stably along the guide rod 2. By using bolts to fix the cylinder body and the flange connecting the piston rod, it is ensured that the cylinder is firmly connected to the base 1 and the lower mold base 3, and the cylinder displacement is avoided during the driving process. The parallelism between the cylinder axis and the axis of the guide rod 2 ensures that the cylinder driving force is applied along the sliding direction of the lower mold base 3, and avoids additional friction between the lower mold base 3 and the guide rod 2 due to the deviation of the driving force direction, thus ensuring the stable sliding of the lower mold base 3.

[0028] The specific implementation process is as follows: The cylinder body is fixed to the center or symmetrical position of the base 1 using bolts, determined according to the dimensions of the lower mold base, ensuring the cylinder body is not tilted. The top of the cylinder piston rod is welded or bolted to the center of the bottom surface of the lower mold base 3 via a flange. Before connection, a level is used to calibrate the parallelism between the cylinder axis and the guide rod 2 axis. If there is a deviation, it is corrected by adjusting the fixed position of the cylinder body on the base 1. The cylinder is connected to the air tank of an external air compressor via an air pipe, and a pressure regulating valve is installed on the air pipe. The air compressor is started, and the air pressure is gradually adjusted, with the initial air pressure set to 0.3 MPa. Simultaneously, the cylinder is started, and the sliding speed and stability of the lower mold base 3 along the guide rod 2 are observed. If the lower mold base 3 slides and jams, check for impurities on the surface of the guide rod 2, and apply lubricating oil if necessary. If the sliding speed is too fast or too slow, the air pressure is adjusted using the pressure regulating valve. The air pressure range is usually controlled between 0.3-0.6 MPa until the lower mold base 3 can move towards or away from the upper mold base 4 at a uniform and stable speed.

[0029] The cylinder is repeatedly activated to drive the lower mold base 3 and upper mold base 4 to close. A feeler gauge is used to check the fit gap between the lower mold base 3 and upper mold base 4 after mold closing, ensuring that the gap is uniform and does not exceed 0.05mm. If the gap is uneven, the parallelism between the cylinder axis and the guide rod 2 axis, or the fit clearance between the lower mold base 3 and the guide rod 2, is checked and adjusted accordingly. The other parts of this embodiment are the same as those in the above embodiment and will not be repeated.

[0030] Example 5: This embodiment further defines the structure of the second driving component 14 based on the above embodiments, such as... Figures 1-4 As shown, the second drive assembly 14 includes a motor, a first gear, and a second gear. The second gear is coaxially and fixedly connected to one end of the heat insulation roller 9 via a key connection. The first gear is rotatably mounted on the side wall of the lower mold base 3 via a bearing, and the first gear and the second gear mesh with each other to form a gear transmission mechanism. The motor base is fixedly mounted on the lower mold base 3 by bolts, and the output shaft of the motor is fixedly connected to the mounting shaft of the first gear via a coupling, which drives the first gear to rotate, and then drives the heat insulation roller 9 to rotate around its own axis via the second gear. The key connection is used to achieve coaxial fixation between the second gear and the heat insulation roller 9, ensuring that the second gear can synchronously drive the heat insulation roller 9 to rotate without relative slippage. The first gear is rotatably mounted on the lower mold base 3 via a bearing, so that the first gear and the second gear mesh precisely. Utilizing the fixed transmission ratio characteristic of gear transmission, it is ensured that the speed of the motor can be converted into the stable speed of the heat insulation roller 9 through the gear ratio, thereby achieving precise control of the rotation position of the second heat-conducting plate 10.

[0031] The specific implementation process is as follows: A keyway is machined at one end of the heat insulation roller 9. The second gear is then connected to the heat insulation roller 9 via a key and fixed coaxially, ensuring that the end face of the second gear is in contact with the end face of the heat insulation roller 9. The first gear is rotatably mounted on the side wall of the lower mold base 3 using a bearing. The position of the first gear is adjusted so that the first gear and the second gear are fully meshed, with the meshing gap controlled at 0.1-0.2mm. Subsequently, the outer ring of the bearing is fixed on the lower mold base 3 to prevent the first gear from axially moving. The motor base is fixed to the side wall of the lower mold base 3 with bolts, ensuring that the motor output shaft is coaxial with the mounting shaft of the first gear. A coupling is used to fix the output shaft of the motor to the mounting shaft of the first gear. Before connection, the coaxiality of the two shafts is calibrated to avoid vibration caused by coaxiality deviation during motor operation. Finally, the motor is connected to an external power source, and the motor rotation direction is checked to ensure that when the motor rotates forward, the rotation direction of the heat insulation roller 9 can bring the second heat-conducting plate 10 closer to the first heat-conducting plate 8. Mark a scale line at the other end of the heat insulation roller 9, start the motor and set a fixed speed. Use a tachometer to measure the actual speed of the heat insulation roller 9 and compare it with the theoretical speed calculated from the motor speed using the gear ratio, ensuring the error does not exceed 5%. At the same time, observe the rotation trajectory of the scale line to ensure that the heat insulation roller 9 rotates without eccentricity. If eccentricity exists, check the meshing accuracy of the first and second gears or the bearing installation accuracy and make adjustments. The other parts of this embodiment are the same as those in the above embodiment and will not be repeated.

[0032] Example 6: This embodiment, based on the above embodiment, further adds a controller, including a controller for controlling the motor's operating parameters. The motor is a servo motor, and the signal input terminal of the servo motor is electrically connected to the signal output terminal of the controller via a wire. The controller is used to control the servo motor's speed, direction, and start / stop, to achieve precise control of the rotation angle and speed of the heat-insulating roller 9, thereby ensuring the accuracy of the alternating heat exchange between the two second heat-conducting plates 10 and the first heat-conducting plate 8. The servo motor has a "position feedback" function, which can transmit its own speed and direction signals to the controller in real time, forming a closed-loop control to ensure that the motor's operating parameters are consistent with the controller's set parameters. The controller, through a preset program, sets the servo motor's speed according to the heat exchange requirements to control the rotation speed of the heat-insulating roller, and controls the direction switching and start / stop timing of the second heat-conducting plates, thereby precisely controlling the rotation angle of the heat-insulating roller 9 to ensure that the two second heat-conducting plates 10 can accurately contact the first heat-conducting plate 8, avoiding heat exchange failure due to excessive or insufficient rotation.

[0033] The specific implementation process is as follows: a servo motor is replaced with a regular motor, and the signal input terminal of the servo motor is connected to the signal output terminal of the controller via a wire. At the same time, the position feedback terminal of the servo motor is connected to the signal input terminal of the controller to form a closed-loop control circuit. A control program is preset on the controller, including a "preheating mode" in which the servo motor drives the heat insulation roller to rotate, so that the second heat-conducting plate through which hot water flows comes into contact with the first heat-conducting plate. The rotation angle is set to 180° and the speed is set to 10 r / min. In the "cooling mode" mode, the servo motor drives the heat insulation roller to rotate 180° in the opposite direction, and the speed is set to 10 r / min, so that the second heat-conducting plate through which cold water flows comes into contact with the first heat-conducting plate.

[0034] Start the controller and switch to preheating mode. Observe whether the servo motor drives the heat insulation roller 9 to rotate according to the preset program. Use an angle meter to measure the actual rotation angle of the heat insulation roller 9 and compare it with the preset 180°. If there is a deviation, adjust the number of pulses of the motor through the controller. The servo motor controls the rotation angle through pulse signals until the error between the actual angle and the preset angle does not exceed 1°. Similarly, calibrate the rotation angle and speed in cooling mode. Set the switching interval between "preheating mode" and "cooling mode" on the controller to 30s. Start the test program and record the response time of the servo motor each time the mode is switched, that is, the time from when the controller sends the switching signal to when the motor starts to rotate, ensuring that the response time does not exceed 1s. At the same time, observe the contact between the second heat conduction plate 10 and the first heat conduction plate 8 to ensure that the second heat conduction plate 10 can fit tightly against the first heat conduction plate 8 without gaps after switching. The other parts of this embodiment are the same as those in the above embodiment and will not be repeated.

[0035] Example 7: Based on the above embodiments, this embodiment further adds a temperature sensor. A temperature sensor is fixedly installed on the side wall of the lower mold base 3, and the detection end of the temperature sensor extends to the inner wall of the lower mold cavity 301. The temperature sensor is electrically connected to the controller. The controller receives the detection signal from the temperature sensor and automatically controls the second drive assembly 14 to drive the heat insulation roller 9 to rotate according to the detected temperature of the lower mold cavity 301, so as to switch the contact between the second heat-conducting plate 10 with the first heat-conducting plate 8 at different temperatures.

[0036] The specific implementation process is as follows: A mounting hole with a diameter matching the temperature sensor is made on the side wall of the lower mold base 3. The depth of the mounting hole is such that the sensor's probe can extend to the inner wall of the lower mold cavity 301. Thermal grease is applied to the probe of the temperature sensor to enhance its thermal conductivity. The sensor is then inserted into the mounting hole and secured with bolts, ensuring a tight fit between the probe and the inner wall of the lower mold cavity 301 without gaps. Shielded wires are used to connect the signal output of the temperature sensor to the signal input of the controller. The wires are wrapped with a heat-insulating sleeve to prevent damage from the high temperature of the mold. Simultaneously, it is confirmed that the controller is electrically connected to the servo motor, forming a complete control loop.

[0037] Start the controller and enter the temperature control parameter setting interface: Set the "preheating trigger threshold" to 50℃, which will initiate preheating when the temperature of the current mold cavity 301 is <50℃; set the cooling trigger threshold to 150℃, which will initiate cooling when the temperature of the current mold cavity 301 is >150℃; set the rotation angle of the heat insulation roller 9 to 180° to ensure accurate switching of the second heat conduction plate 10; set the rotation speed to 8 r / min to avoid temperature fluctuations caused by excessive rotation. If the temperature sensor detects a temperature exceeding the normal range (e.g., >200℃ or <20℃) three times consecutively, the controller will automatically cut off the power to the second drive component 14 and issue an alarm signal to prevent damage to the mold or plastic parts.

[0038] When the mold power is turned on, the controller receives the temperature data of the lower mold cavity 301 transmitted by the temperature sensor in real time. The initial room temperature is about 25°C. When the detected temperature is <50°C, the controller automatically sends a signal to the servo motor to drive the first gear, the second gear, and the second drive component 14 to rotate, which drives the heat insulation roller 9 to rotate 180°, so that the second heat conduction plate 10 with hot water comes into contact with the first heat conduction plate 8. The temperature of the lower mold cavity 301 is continuously monitored. When the temperature rises to 50°C, the controller sends a stop signal, and the heat insulation roller 9 stops rotating, verifying that the preheating trigger logic is normal.

[0039] The injection hole 401 of the upper mold base 4 is connected to the outlet of the injection molding machine. The first drive assembly 5 is started, pushing the lower mold base 3 to slide upward along the guide rod 2 and close with the upper mold base 4. The injection molding machine injects molten plastic into the lower mold cavity 301 at a temperature of about 220°C. At this time, the temperature sensor detects that the temperature of the lower mold cavity 301 rises rapidly to above 150°C. The controller immediately drives the heat insulation roller 9 to rotate 180° in the opposite direction, switching to the second heat conduction plate 10 with cooling water in contact with the first heat conduction plate 8. The temperature of the lower mold cavity 301 gradually drops to 80-100°C, the optimal temperature for plastic molding. After molding, the first drive assembly 5 drives the lower mold base 3 to move down and open the mold. The ejector pin 6 ejects the molded part. The controller records the heat exchange switching response time, which is usually <1.5s, to ensure stable system operation. The other parts of this embodiment are the same as those in the above embodiment and will not be described again.

[0040] Example 8: This embodiment further defines the structure of the heat insulation sleeve 7 based on the above embodiments, such as... Figure 4As shown, the sidewall of the heat insulation sleeve 7 has two first side windows 701 corresponding to the movement trajectory of the two second heat-conducting plates 10. These first side windows 701 are symmetrically arranged, and their dimensions are adapted to the dimensions of the second heat-conducting plates 10. When the second heat-conducting plates 10 rotate under the drive of the heat insulation roller 9, they can make close contact with the first heat-conducting plates 8 through the first side windows 701. An elastic sealing gasket is provided at the edge of each first side window 701. The first side windows 701, matching the movement trajectory of the second heat-conducting plates 10, and their dimensions, provide a channel for the rotation of the second heat-conducting plates 10, preventing obstruction by the sidewall of the heat insulation sleeve 7. This ensures that the second heat-conducting plates 10 can make precise and close contact with the first heat-conducting plates 8, improving heat transfer efficiency. An elastic sealing gasket is provided at the edge of the first side window 701. It is made of high-temperature resistant silicone rubber. When the second heat-conducting plate 10 comes into contact with the first heat-conducting plate 8 through the first side window 701, the sealing gasket is squeezed and deformed, filling the gap between the second heat-conducting plate 10 and the first side window 701, reducing the loss of heat to the outside of the heat insulation sleeve 7, and preventing external dust and impurities from entering the interior of the heat insulation sleeve 7, thus protecting the serpentine channel 901 and the heat-conducting plate structure.

[0041] The specific implementation process is as follows: high-temperature resistant heat insulation materials, such as ceramic fiber reinforced plastic, are used to process the heat insulation sleeve 7, ensuring that the gap between its inner wall and the outer wall of the heat insulation roller 9 is controlled at 0.5-1mm to ensure the smooth rotation of the heat insulation roller 9; according to the size and rotation trajectory of the second heat-conducting plate 10, two first side windows 701 are symmetrically opened on the side wall of the heat insulation sleeve 7 with the axis of the heat insulation roller 9 as the center. The size of the first side window 701 is set to be 105mm long and 55mm wide, slightly larger than the second heat-conducting plate 10, with a reserved installation margin. The central angles of the two first side windows 701 are 180° apart, consistent with the symmetrical arrangement of the second heat-conducting plate 10.

[0042] The edges of the first side window 701 are polished to remove burrs and prevent scratching of the surface of the second heat-conducting plate 10 during rotation; a sealing groove with a width of 5mm and a depth of 3mm is opened on the edge of the first side window 701 for installing an elastic sealing gasket.

[0043] Cut a high-temperature resistant silicone rubber elastic sealing gasket to fit the sealing groove of the first side window 701. Embed the sealing gasket into the sealing groove and fix it with high-temperature resistant adhesive, such as epoxy resin, ensuring that the surface of the sealing gasket is about 1-2mm higher than the inner wall of the heat insulation sleeve 7, so that it can be fully compressed and deformed when in contact with the second heat-conducting plate 10. Insert the processed heat insulation sleeve 7 into the mounting cavity of the lower mold base 3, ensuring that the outer wall of the heat insulation sleeve 7 is tightly fitted with the inner wall of the lower mold base 3. Install the heat insulation roller 9 in the heat insulation sleeve 7 through the bearing, manually rotate the heat insulation roller 9, and observe whether the second heat-conducting plate 10 can pass smoothly through the first side window 701 and without jamming when in contact with the elastic sealing gasket. If there is jamming, lightly grind the edge of the sealing gasket until the heat insulation roller 9 can rotate smoothly.

[0044] Hot water at 80°C is introduced into one of the serpentine channels 901 of the heat insulation roller 9, and cold water at 20°C is introduced into the other serpentine channel 901. The second drive assembly 14 is started to drive the heat insulation roller 9 to rotate at a speed of 10 r / min. The temperature of the outer wall of the heat insulation sleeve 7 is detected using an infrared thermometer. If the temperature difference between the area near the first side window 701 and other areas of the heat insulation sleeve 7 is less than 5°C, it indicates that the elastic sealing gasket has a good sealing effect and there is no significant heat loss. If the difference is greater than 5°C, check whether the sealing gasket is installed properly and replace it with a thicker sealing gasket if necessary. The lower mold base 3 and the upper mold base 4 are closed, and a small amount of molten plastic is injected into the lower mold cavity 301 through the injection hole 401. The time it takes for the temperature of the mold cavity 301 to drop from 180°C to 80°C is recorded. Before optimization, it was about 30 seconds. After optimization, the time was shortened to 20-22 seconds, indicating that the first side window 701 ensures close contact between the second heat-conducting plate 10 and the first heat-conducting plate 8, the elastic sealing gasket reduces heat loss, and the heat exchange efficiency is significantly improved. The other parts of this embodiment are the same as those in the above embodiments, and will not be described again.

[0045] It is understood that the working principle and process of the injection mold structure according to one embodiment of the present invention, such as the heat conduction plate and the return pipe, are existing technologies and are well known to those skilled in the art, and will not be described in detail here.

[0046] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An injection mold for injection molding plastic sheets for terminal blocks, characterized in that, include: The base (1) has several guide rods (2) that extend vertically. The guide rods (2) are fitted with a lower mold base (3) that can slide along its axial direction. The end of the guide rod (2) away from the base (1) is fixedly connected to the upper mold base (4). The lower mold base (3) and the upper mold base (4) are correspondingly arranged to form a closed mold cavity. The first drive assembly (5) is mounted on the base (1) and its output end is connected to the lower mold base (3) for driving the lower mold base (3) to move away from or closer to the upper mold base (4) along the guide rod (2) axial direction. Ejector pins (6), several sets of ejector pins (6) are fixedly set on the base (1), and each set of ejector pins (6) slides into the lower mold base (3) in the vertical direction. The ejector pins (6) are used to eject the molded parts in the mold cavity when the mold is opened. A heat insulation sleeve (7) is embedded in the lower mold base (3) and closely fits the inner wall of the lower mold base (3). A first heat-conducting plate (8) is fixedly installed on the outer wall of the heat insulation sleeve (7). The first heat-conducting plate (8) is closely fitted with the inner wall of the mounting cavity of the lower mold base (3) to transfer heat and regulate the temperature of the lower mold base (3). A heat-insulating roller (9) is rotatably mounted inside a heat-insulating sleeve (7) via a bearing, and the heat-insulating roller (9) is coaxially arranged with the heat-insulating sleeve (7). Two independent serpentine channels (901) are symmetrically opened inside the heat-insulating roller (9). A second side window (902) is opened on the side wall of the heat-insulating roller (9) corresponding to the two serpentine channels (901). The two second side windows (902) are connected to the serpentine channels (901) on the corresponding side. A second heat-conducting plate (10) is fixedly installed at the opening of each second side window (902). The second heat-conducting plate (10) is tightly fitted to the inner wall of the heat-insulating sleeve (7) and the inner wall of the first heat-conducting plate (8). A rotary joint (11) is connected to each end of the two serpentine channels (901). The rotary joint (11) is used to realize the connection between the serpentine channels (901) and the external pipeline. And a second drive assembly (14), which is fixedly mounted on the lower mold base (3) and its output end is connected to the heat insulation roller (9) for driving the heat insulation roller (9) to rotate around its own axis so that the two second heat-conducting plates (10) alternately contact the first heat-conducting plate (8) and exchange heat.

2. The injection mold for injection molding plastic sheets for terminal blocks according to claim 1, characterized in that, The top surface of the lower mold base (3) is provided with a plurality of lower mold cavities (301) for molding plastic sheets of terminal blocks. The top surface of the upper mold base (4) is provided with injection holes (401). The lower end of the injection hole (401) passes through the upper mold base (4) and is connected to each lower mold cavity (301) for injecting molten plastic into all lower mold cavities (301). When the lower mold base (3) and the upper mold base (4) are in a closed mold state, the top end face of the ejector pin (6) is flush with the bottom surface of the lower mold cavity (301) to ensure that the bottom surface of the lower mold cavity (301) is flat and avoid affecting the bottom surface accuracy of the molded part.

3. The injection mold for injection molding a plastic sheet for a terminal block according to claim 1 or 2, characterized in that, The rotary joint (11) includes a disc-shaped joint body. The joint body has a first annular cavity (111) and a second annular cavity (112) coaxially formed inside, and the first annular cavity (111) and the second annular cavity (112) are independent of each other. A first annular cover is rotatably mounted on the joint body at the opening corresponding to the first annular cavity (111) via a rotary seal. A first guide tube is fixedly connected to the first annular cover. One end of the first guide tube communicates with the first annular cavity (111), and the other end is sealed and communicated with one end of the corresponding side serpentine channel (901). The joint body also has a corresponding annular cavity (112)... The opening of the connector body is provided with a second annular cover by a rotating seal. A second guide tube is fixedly connected to the second annular cover. One end of the second guide tube is connected to the second annular cavity (112), and the other end is sealed and connected to the other end of the corresponding side serpentine channel (901). A first return pipe (12) and a second return pipe (13) are also fixedly connected to the side wall of the connector body. One end of the first return pipe (12) is connected to the first annular cavity (111), and the other end is used to connect to the external return pipe. One end of the second return pipe (13) is connected to the second annular cavity (112), and the other end is used to connect to the external return pipe.

4. An injection mold for injection molding plastic sheets for terminal blocks according to claim 1 or 2, characterized in that, The first drive assembly (5) includes a cylinder. The cylinder body is fixedly connected to the base (1) by bolts. The top end of the piston rod of the cylinder is fixedly connected to the bottom surface of the lower mold base (3) by a flange. The axis of the cylinder is parallel to the axis of the guide rod (2) and is used to drive the lower mold base (3) to slide stably along the guide rod (2).

5. An injection mold for injection molding plastic sheets for terminal blocks according to claim 1 or 2, characterized in that, The second drive assembly (14) includes a motor, a first gear and a second gear. The second gear is coaxially and fixedly connected to one end of the heat insulation roller (9) by a key connection. The first gear is rotatably mounted on the side wall of the lower mold base (3) by a bearing, and the first gear and the second gear mesh with each other to form a gear transmission mechanism. The base of the motor is fixedly mounted on the lower mold base (3) by bolts. The output shaft of the motor is fixedly connected to the mounting shaft of the first gear by a coupling to drive the first gear to rotate, and then drive the heat insulation roller (9) to rotate around its own axis through the second gear.

6. The injection mold for injection molding plastic sheets for terminal blocks according to claim 5, characterized in that, It also includes a controller for controlling the operating parameters of the motor. The motor is a servo motor. The signal input terminal of the servo motor is electrically connected to the signal output terminal of the controller through a wire. The controller is used to control the speed, direction and start / stop of the servo motor to achieve precise control of the rotation angle and rotation speed of the heat insulation roller (9), thereby ensuring the accuracy of heat exchange between the two second heat-conducting plates (10) and the first heat-conducting plate (8).

7. The injection mold for injection molding a plastic sheet for a terminal block according to claim 6, characterized in that, A temperature sensor is fixedly installed on the side wall of the lower mold base (3), and the detection end of the temperature sensor extends to the inner wall of the lower mold cavity (301). The temperature sensor is electrically connected to the controller. The controller receives the detection signal of the temperature sensor and automatically controls the second drive assembly (14) to drive the heat insulation roller (9) to rotate according to the detected temperature of the lower mold cavity (301) so as to switch the contact between the second heat-conducting plate (10) with the first heat-conducting plate (8) at different temperatures.

8. An injection mold for injection molding plastic sheets for terminal blocks according to claim 1 or 2, characterized in that, The heat insulation sleeve (7) has a first side window (701) on its side wall corresponding to the movement trajectory of the two second heat-conducting plates (10). There are two first side windows (701) arranged symmetrically. The size of each first side window (701) is adapted to the size of the second heat-conducting plate (10). When the second heat-conducting plate (10) rotates under the drive of the heat insulation roller (9), it can make close contact with the first heat-conducting plate (8) through the first side window (701). An elastic sealing gasket is provided at the edge of the first side window (701).

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