Anti-blocking foaming gun head and ultra-low temperature refrigerator

Abstract

The application provides an anti-blocking foaming gun head and an ultra-low temperature refrigerator, and relates to the technical field of the ultra-low temperature refrigerator.The anti-blocking foaming gun head comprises a reciprocating driving mechanism and a cleaning drill bit.The reciprocating driving mechanism is arranged in an operation cavity, and the cleaning drill bit is arranged in a discharging cavity.When air in a first air pressure bin and a second air pressure bin is discharged, the generated air pressure is used to reach the position of the reciprocating driving mechanism through an air pressure channel.The reciprocating driving mechanism is used to drive the cleaning drill bit to make reciprocating movement under the action of the air pressure.In the process of moving towards the opening direction of the discharging cavity, the cleaning drill bit is used to block the first discharging port and the second discharging port.The anti-blocking foaming gun head of the application, compared with the prior art, utilizes the flow pressure of the raw material itself and the action of the mechanical structure to prevent the injection pressure from being unstable due to the blockage, without wasting other energy, so that the energy-saving effect is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ultra-low temperature refrigerators, in particular to a foaming gun head capable of preventing blockage and an ultra-low temperature refrigerator. BACKGROUND

[0002] In the development process of current refrigerators, due to the need for vaccines and cell organs to be stored at very low temperatures, ultra-low temperature refrigerator technology has emerged. In addition to refrigeration technology, insulation technology is also very important in ultra-low temperature refrigerator technology. At present, the most common insulation layer is foamed material insulation. Two raw materials are mixed and injected into the box to form a foamed layer with the required density.

[0003] When the foaming liquid used to form the foamed layer is injected, two raw materials (isocyanate and combined polyether) need to be mixed. Since the reaction and expansion have begun during the mixing process and solidification has occurred, the end of the pipe of the foaming gun used to mix and inject the two raw materials is prone to residual solidified foam liquid. Employees need to clean the end of the pipe before the next injection, otherwise the pipe will be blocked during the next injection, causing unstable injection pressure, thereby affecting the uniformity of the foamed layer in the box. SUMMARY

[0004] The problem to be solved by the present application is how to solve the problem of unstable injection pressure of the foaming gun.

[0005] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows:

[0006] A foaming gun head capable of preventing blockage comprises:

[0007] A main gun body, an internal space of the main gun body is partitioned to form a first injection cavity, a second injection cavity and a discharge cavity, and the discharge cavity is located between the first injection cavity and the second injection cavity, a first discharge port is formed between the discharge cavity and the first injection cavity to communicate the two, and a second discharge port is formed between the discharge cavity and the second injection cavity to communicate the two; the internal space of the main gun body is partitioned to form a first air pressure chamber and a second air pressure chamber, the first air pressure chamber communicates with the first injection cavity, and the second air pressure chamber communicates with the second injection cavity;

[0008] A first piston group, the first piston group is partially arranged in the first injection cavity and partially arranged in the first air pressure chamber, and the first piston group is used to discharge air in the first air pressure chamber;

[0009] A second piston group, the second piston group is partially arranged in the second injection cavity and partially arranged in the second air pressure chamber, and the second piston group is used to discharge air in the second air pressure chamber;

[0010] The interior of the main gun body is provided with an operation cavity, the operation cavity is coaxially arranged with the discharge cavity and communicates with each other, the interior of the main gun body is provided with an air pressure channel, one end of the air pressure channel respectively communicates with the first air pressure chamber and the second air pressure chamber, and the other end communicates with the operation cavity;

[0011] A cleaning mechanism is arranged in the operation cavity, the cleaning mechanism comprises a reciprocating driving mechanism and a cleaning drill bit, when the air in the first air pressure chamber and the second air pressure chamber is discharged, the air pressure generated thereby is used to reach the position of the reciprocating driving mechanism through the air pressure channel, the reciprocating driving mechanism is used to drive the cleaning drill bit to reciprocate under the action of the air pressure, in the process of moving towards the opening direction of the discharge cavity, the cleaning drill bit is used to block the first discharge port and the second discharge port, and when moving away from the opening direction of the discharge cavity, the cleaning drill bit moves to the position where the first discharge port and the second discharge port are not blocked.

[0012] The foaming gun head provided by the application has the following beneficial effects, but is not limited to the following beneficial effects:

[0013] When the foaming liquid is injected, the two kinds of raw materials enter the main gun body from the first injection cavity and the second injection cavity, at this time, the two kinds of raw materials push the first piston group and the second piston group to move in the opposite direction of the raw material pressure under the action of the injection pressure, the movement of the first piston group and the second piston group extrudes the air in the first air pressure chamber and the second air pressure chamber, under the action of the air pressure, the air pressure reaches the position of the reciprocating driving mechanism through the air pressure channel, so that the reciprocating driving mechanism drives the cleaning drill bit to move towards the outlet end of the discharge cavity, the cleaning drill bit can push the foaming liquid in the discharge cavity out, in the process of cleaning the foaming liquid in the discharge cavity by the cleaning mechanism, the cleaning drill bit can block the first discharge port and the second discharge port, so that the foaming liquid in the first injection cavity and the second injection cavity is prevented from entering the discharge cavity. The cleaning drill bit is driven by the reciprocating driving mechanism to move away from the outlet end of the discharge cavity, until the first discharge port and the second discharge port are no longer blocked by the cleaning drill bit, at this time, the foaming liquid in the first injection cavity and the second injection cavity is mixed and injected in the discharge cavity, so that the phenomenon of unstable injection pressure caused by the foaming liquid in the discharge cavity is prevented. The foaming gun head provided by the application, compared with the prior art, by using the flow pressure of the raw materials and the action of the mechanical structure, the function of preventing the injection pressure from being unstable due to the blockage is achieved without wasting other energy, so that the energy-saving effect is achieved.

[0014] Optionally, the reciprocating driving mechanism comprises a thrust piston, a special-shaped screw rod, thrust balls and a screw block, the special-shaped screw rod is rotatably arranged inside the operation cavity, the thrust balls are connected to the thrust piston, the special-shaped screw rod is a hollow structure, and a special-shaped groove is formed along the inner wall of the special-shaped screw rod, the thrust balls are used for being in sliding connection with the special-shaped groove, the sliding of the thrust balls in the special-shaped groove is used for driving the special-shaped screw rod to rotate, the circumference of the special-shaped screw rod is in threaded connection with the screw block, the screw block and the special-shaped screw rod are respectively in sliding connection with the cleaning drill bit, and the screw block is used for driving the cleaning drill bit to make linear reciprocating motion in the discharging cavity, while the rotation of the special-shaped screw rod is used for driving the cleaning drill bit to make synchronous rotation.

[0015] Optionally, the special-shaped groove is provided with three sections, i.e. a normal helical section, a smooth section and a reverse helical section, and the smooth section is located between the normal helical section and the reverse helical section.

[0016] Optionally, the length of the normal helical section is less than the length of the reverse helical section.

[0017] Optionally, one end of the special-shaped screw rod is provided with a dovetail pin, the inside of the cleaning drill bit is provided with a dovetail groove, the dovetail pin is used for being in sliding connection with the dovetail groove, and the length of the dovetail groove is equal to the longest distance of the movement of the screw block in the normal helical section and the reverse helical section.

[0018] Optionally, the inner wall of the operation cavity is provided with a limiting groove extending along the axial direction of the special-shaped screw rod, the limiting groove is used for limiting the screw block, and the length of the limiting groove is greater than the shortest distance from the cleaning drill bit to the outlet end of the discharging cavity at the initial time.

[0019] Optionally, a first partition wall is arranged between the first injection cavity and the first gas pressure chamber, and a first communication port is arranged on the first partition wall to connect the first injection cavity and the first gas pressure chamber.

[0020] The first piston group comprises a first piston block, a first spring, a first transmission rod and a first pressure plug, the first piston block is arranged in the first injection cavity, the first pressure plug is arranged in the first gas pressure chamber, the first transmission rod passes through the first communication port and is connected between the first piston block and the first pressure plug, the first spring is sleeved on the first transmission rod, one end of the first spring is connected with the first partition wall, and the other end of the first spring is connected with the first piston block, so as to reset the first piston block and the first pressure plug.

[0021] Optionally, a second partition wall is arranged between the second injection cavity and the second air pressure chamber, and a second communication opening is arranged on the second partition wall to communicate the second injection cavity and the second air pressure chamber.

[0022] The second piston group comprises a second piston block, a second spring, a second transmission rod and a second pressure plug, the second piston block is arranged in the second injection cavity, the second pressure plug is arranged in the second air pressure chamber, the second transmission rod passes through the second communication opening and is connected between the second piston block and the second pressure plug, the second spring is sleeved on the second transmission rod, one end of the second spring is connected with the second partition wall and the other end is connected with the second piston block to reset the second piston block and the second pressure plug.

[0023] Optionally, an end of the cleaning drill bit away from the special-shaped lead screw is a spiral structure.

[0024] In addition, the application also provides an ultra-low temperature refrigerator comprising the anti-blocking foaming gun head as described above.

[0025] Since the technical improvement and technical effects of the ultra-low temperature refrigerator are the same as those of the anti-blocking foaming gun head, the technical effects of the ultra-low temperature refrigerator will not be described in detail. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the anti-blocking foaming gun head of the embodiment of the application;

[0027] Figure 2 It is a sectional view of the anti-blocking foaming gun head of the embodiment of the application Figure 1 ;

[0028] Figure 3 It is Figure 2 a local enlarged view at A in the middle;

[0029] Figure 4 It is a sectional view of the anti-blocking foaming gun head of the embodiment of the application Figure 2 ;

[0030] Figure 5 It is Figure 4 a local enlarged view at B in the middle;

[0031] Figure 6 It is Figure 4 a local enlarged view at C in the middle;

[0032] Figure 7 It is a sectional view of the anti-blocking foaming gun head of the embodiment of the application Figure 3 .

[0033] BRIEF DESCRIPTION OF DRAWINGS:

[0034] 1, main gun body; 2, first injection cavity; 3, second injection cavity; 4, discharge cavity; 5, first piston block; 6, first spring; 7, first transmission rod; 8, first pressure plug; 9, first air pressure chamber; 10, second piston block; 11, second spring; 12, second transmission rod; 13, second pressure plug; 14, second air pressure chamber; 15, air pressure channel; 16, thrust piston; 17, thrust ball; 18, special screw; 19, special groove; 19a, normal screw section; 19b, smooth section; 19c, reverse screw section; 20, cleaning drill bit; 21, limiting groove; 22, dovetail groove; 23, screw block; 24, first discharge port; 25, second discharge port. DETAILED DESCRIPTION

[0035] In order to make the above objectives, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0036] In the description of the present application, the orientation or position relationship indicated by "upper", "lower", "left", "right", "top", "bottom", "front", "back", "inner" and "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application, and does not indicate or imply that the device must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the scope of protection of the present application.

[0037] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] In the description of the present application, the description of the terms "embodiment", "one embodiment" and "one embodiment" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or embodiment are included in at least one embodiment or embodiment of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or embodiment. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or embodiments in a suitable manner.

[0039] Moreover, in the drawings, the X-axis represents the lateral direction, that is, the left and right positions, and the positive direction of the X-axis, that is, the direction of the arrow of the X-axis, represents the right, and the negative direction of the X-axis, that is, the direction opposite to the positive direction of the X-axis, represents the left.

[0040] It should be noted that the aforementioned X-axis represents the meaning is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0041] As shown in Figures 1 to 4 Fig. 1, a foaming gun head of the present application is provided with a main gun body 1, a first injection cavity 2, a second injection cavity 3, a discharge cavity 4, a first discharge port 24, a second discharge port 25, a first gas pressure chamber 9, a second gas pressure chamber 14, a first piston group, a second piston group, an operating cavity, and a gas pressure channel 15.

[0042] The main gun body 1 is internally provided with the first injection cavity 2, the second injection cavity 3, and the discharge cavity 4, and the discharge cavity 4 is located between the first injection cavity 2 and the second injection cavity 3. The discharge cavity 4 and the first injection cavity 2 are provided with the first discharge port 24 for their communication, and the discharge cavity 4 and the second injection cavity 3 are provided with the second discharge port 25 for their communication. The main gun body 1 is internally provided with the first gas pressure chamber 9 and the second gas pressure chamber 14, and the first gas pressure chamber 9 is in communication with the first injection cavity 2, and the second gas pressure chamber 14 is in communication with the second injection cavity 3.

[0043] The first piston group is partially arranged in the first injection cavity 2 and partially arranged in the first gas pressure chamber 9, and is used for discharging air in the first gas pressure chamber 9.

[0044] The second piston group is partially arranged in the second injection cavity 3 and partially arranged in the second gas pressure chamber 14, and is used for discharging air in the second gas pressure chamber 14.

[0045] The main gun body 1 is internally provided with the operating cavity, which is coaxially arranged with the discharge cavity 4 and in communication with each other. The main gun body 1 is internally provided with the gas pressure channel 15, one end of which is in communication with the first gas pressure chamber 9 and the second gas pressure chamber 14, and the other end is in communication with the operating cavity.

[0046] The cleaning mechanism comprises a reciprocating driving mechanism arranged in the operation cavity and a cleaning drill bit 20 arranged in the discharge cavity 4, when the air inside the first air pressure chamber 9 and the second air pressure chamber 14 is discharged, the air pressure generated is used to reach the position of the reciprocating driving mechanism through the air pressure channel 15, the reciprocating driving mechanism is used to drive the cleaning drill bit 20 to reciprocate under the action of the air pressure, in the process of moving towards the opening direction of the discharge cavity 4, the cleaning drill bit 20 is used to block the first discharge port 24 and the second discharge port 25, and when moving away from the opening direction of the discharge cavity 4, the cleaning drill bit 20 moves to the first discharge port 24 and the second discharge port 25 are not blocked.

[0047] In the embodiment, the accompanying drawings are combined Figures 1 to 4 When the injection of the foaming liquid is started, the two raw materials enter the main gun body 1 from the first injection cavity 2 and the second injection cavity 3 respectively, at this time, the two raw materials push the first piston group and the second piston group to move under the action of the injection pressure, the movement of the first piston group and the second piston group extrudes the air in the first air pressure chamber 9 and the second air pressure chamber 14, under the action of the air pressure, the air pressure reaches the position of the reciprocating driving mechanism through the air pressure channel 15, so that the reciprocating driving mechanism drives the cleaning drill bit 20 to move towards the outlet end of the discharge cavity 4, the cleaning drill bit 20 can push the foaming liquid in the discharge cavity 4 out, in the process of cleaning the foaming liquid in the discharge cavity 4 by the cleaning mechanism, the cleaning drill bit 20 can block the first discharge port 24 and the second discharge port 25, so that the foaming liquid in the first injection cavity 2 and the second injection cavity 3 enters the discharge cavity 4. The cleaning drill bit 20 is driven by the reciprocating driving mechanism to move away from the outlet end of the discharge cavity 4, until the first discharge port 24 and the second discharge port 25 are no longer blocked by the cleaning drill bit 20, at this time, the foaming liquid in the first injection cavity 5 and the second injection cavity 3 is mixed and injected in the discharge cavity 4, thereby achieving the effect of preventing the phenomenon of unstable injection pressure caused by the blockage of the foaming liquid inside the discharge cavity 4. Compared with the prior art, the anti-blocking foaming gun head of the present application utilizes the flow pressure of the raw materials itself and the action of the mechanical structure, without wasting other energy sources, thereby achieving the effect of energy saving.

[0048] Optionally, the reciprocating driving mechanism comprises a thrust piston 16, a profiled screw 18, thrust balls 17 and a screw block 23, the profiled screw 18 is rotatably arranged inside the operation cavity, the thrust balls 17 are connected to the thrust piston 16, the profiled screw 18 is hollow, and the profiled screw 18 is provided with a profiled groove 19 along the circumference of the inner wall, the thrust balls 17 are used for sliding connection with the profiled groove 19, the sliding of the thrust balls 17 in the profiled groove 19 is used for driving the profiled screw 18 to rotate, the circumference of the profiled screw 18 is rotatably connected with the screw block 23 through threads, the screw block 23 and the profiled screw 18 are respectively slidably connected with the cleaning drill bit 20, and the screw block 23 is used for driving the cleaning drill bit 20 to make linear reciprocating motion in the discharge cavity 4, while the rotation of the profiled screw 18 is used for driving the cleaning drill bit 20 to make synchronous rotation.

[0049] In the embodiment, the profiled screw 18 is rotatably arranged inside the operation cavity, the thrust balls 17 are connected to the thrust piston 16, the profiled screw 18 is hollow, and the profiled screw 18 is provided with a profiled groove 19 along the circumference of the inner wall, the thrust balls 17 are used for sliding connection with the profiled groove 19, the sliding of the thrust balls 17 in the profiled groove 19 is used for driving the profiled screw 18 to rotate, the circumference of the profiled screw 18 is rotatably connected with the screw block 23 through threads, the screw block 23 and the profiled screw 18 are respectively slidably connected with the cleaning drill bit 20, and the screw block 23 is used for driving the cleaning drill bit 20 to make linear reciprocating motion in the discharge cavity 4, while the rotation of the profiled screw 18 is used for driving the cleaning drill bit 20 to make synchronous rotation. Figures 2 to 5 As shown in the figure, the air pressure reaches the position of the thrust piston 16 through the air pressure channel 15 (as shown in the figure, the air pressure channel 15 is arranged on the side wall of the operation cavity, and the air pressure channel 15 is connected with the air pressure source 14), and the air pressure drives the thrust piston 16 to move to the left (as shown in the figure, the movement direction of the thrust piston 16 is the X-axis direction in the figure). Figure 4 As shown in the figure, the air pressure reaches the position of the thrust piston 16 through the air pressure channel 15 (as shown in the figure, the air pressure channel 15 is arranged on the side wall of the operation cavity, and the air pressure channel 15 is connected with the air pressure source 14), and the air pressure drives the thrust piston 16 to move to the left (as shown in the figure, the movement direction of the thrust piston 16 is the X-axis direction in the figure). Figure 1 As shown in the figure, the air pressure reaches the position of the thrust piston 16 through the air pressure channel 15 (as shown in the figure, the air pressure channel 15 is arranged on the side wall of the operation cavity, and the air pressure channel 15 is connected with the air pressure source 14), and the air pressure drives the thrust piston 16 to move to the left (as shown in the figure, the movement direction of the thrust piston 16 is the X-axis direction in the figure). Figure 5 As shown in the figure, the air pressure reaches the position of the thrust piston 16 through the air pressure channel 15 (as shown in the figure, the air pressure channel 15 is arranged on the side wall of the operation cavity, and the air pressure channel 15 is connected with the air pressure source 14), and the air pressure drives the thrust piston 16 to move to the left (as shown in the figure, the movement direction of the thrust piston 16 is the X-axis direction in the figure). Figure 6 As shown in the figure, the air pressure reaches the position of the thrust piston 16 through the air pressure channel 15 (as shown in the figure, the air pressure channel 15 is arranged on the side wall of the operation cavity, and the air pressure channel 15 is connected with the air pressure source 14), and the air pressure drives the thrust piston 16 to move to the left (as shown in the figure, the movement direction of the thrust piston 16 is the X-axis direction in the figure).

[0050] Optionally, the profiled groove 19 is provided with three sections, which are a normal helical section 19a, a smooth section 19b and an inverse helical section 19c, and the smooth section 19b is located between the normal helical section 19a and the inverse helical section 19c.

[0051] In this embodiment, combined with the Figure 6 As shown, the special-shaped groove 19 can make the thrust ball 17 slide along the special-shaped groove 19, first drive the special-shaped screw 18 to rotate forward (positive spiral section), then stop transition in the second section (smooth section), and drive the special-shaped screw 18 to reverse (anti-spiral section) in the third section. Due to the structural setting of the special-shaped groove 19, the screw slider 23 first moves forward (towards the direction close to the discharge chamber 4) in the first section (positive spiral section) of the special-shaped groove 19, stops moving in the second section (smooth section) of the special-shaped groove 19, and stops in the third section (anti-spiral section). The third section (reverse spiral section) of the shaped groove 19 moves backward (towards the direction away from the discharge chamber 4), and at the same time, the cleaning drill bit 20 rotates forward in the first section under the action of the special-shaped screw 18, stops in the second section, and reverses in the third section. Then, under the joint action of the special-shaped screw 18 and the screw slider 23, the movement of the cleaning drill bit 20 in the injection stage is to first turn forward to the left (towards the outlet end near the discharge chamber 4) to clean and push out the foaming liquid in the discharge pipe 4, then stop for a transition period, and finally reverse to the right (as shown in FIG. Figure 4 As shown, the purpose of the reversal is to remove the foaming liquid adhering to the drill bit through the action of the reversal inertia, so as to ensure that the pipeline inside the discharge pipe 4 is unobstructed), and move to the right (towards the outlet end away from the discharge chamber 4) until the first discharge port 24 and the second discharge port 25 are no longer blocked by the cleaning drill bit 20.

[0052] Optionally, the length of the positive helical segment 19a is smaller than the length of the negative helical segment 19c.

[0053] In this embodiment, the length of the positive spiral section 19a determines the forward movement distance of the cleaning drill bit 20, and the length of the reverse spiral section 19c determines the backward movement distance of the cleaning drill bit 20. Figures 2 to 3 As shown, by designing the length of the positive spiral section 19a of the special-shaped groove 19 to be smaller than the length of the reverse spiral section 19c, the retreat distance of the cleaning drill bit 20 can be made greater than the forward movement distance, so that the cleaning drill bit 20 can be retreated to the first discharge port 24 and the second discharge port 25 without being blocked.

[0054] Optionally, a dovetail pin is provided at one end of the special-shaped screw 18, and a dovetail groove 22 is opened inside the cleaning drill bit 20. The dovetail pin is used to be slidably connected to the dovetail groove 22, and the length of the dovetail groove 22 is equal to the longest distance of movement of the screw slider 23 in the positive spiral section 19a and the reverse spiral section 19c.

[0055] In this embodiment, if Figure 6As shown, the end of the special-shaped screw 18 used for cooperating connection with the cleaning drill bit 20 is provided with a dovetail pin, the inside of the cleaning drill bit 20 is provided with a dovetail groove 22 used for cooperating with the special-shaped screw 18, the dovetail groove 22 extends from the end of the cleaning drill bit 20 to the inside, and the dovetail pin is used for being inserted into the dovetail groove 22 and sliding along the length direction of the dovetail groove 22, the special-shaped screw 18 rotates to drive the cleaning drill bit 20 to rotate (at the same time, sliding along the length direction of the dovetail groove 22), wherein the length of the dovetail groove 22 is equal to the longest distance of the movement of the screw block 23 in the positive helical section and the reverse helical section, so as to ensure that the cleaning drill bit 20 is always cooperated with the special-shaped screw 18 in the movement process of the screw block 23, and the use of the dovetail groove 22 can increase the transmission stability and increase the service life of the device.

[0056] Optionally, the inner wall of the operation cavity is provided with a limiting groove 21 extending along the axial direction of the special-shaped screw 18, used for limiting the screw block 23, and the length of the limiting groove 21 is greater than the shortest distance from the cleaning drill bit 20 to the outlet end of the discharge cavity 4 at the initial time.

[0057] In this embodiment, the accompanying drawings are combined Figure 6 As shown, the limiting groove 21 inside the operation cavity between the thrust piston 16 and the main gun body 1 limits the screw block 23, so as to ensure that the screw block 23 can only move horizontally and cannot rotate relative to the special-shaped screw 18, and the length of the limiting groove 21 is greater than the shortest distance from the cleaning drill bit 20 to the outlet end of the discharge cavity 4 at the initial time, so as to ensure that the cleaning drill bit 20 can completely push out the foaming liquid in the discharge cavity 4.

[0058] In other embodiments, the limiting groove 21 can be symmetrically arranged about the central axis inside the screw block 23, so as to ensure the stability of the movement of the screw block 23.

[0059] Optionally, a first partition wall is arranged between the first injection cavity 2 and the first gas pressure chamber 9, and a first communication port for connecting the first injection cavity 2 and the first gas pressure chamber 9 is arranged on the first partition wall.

[0060] The first piston group includes a first piston block 5, a first spring 6, a first transmission rod 7 and a first pressure plug 8, the first piston block 5 is arranged in the first injection cavity 2, the first pressure plug 8 is arranged in the first gas pressure chamber 9, the first transmission rod 7 passes through the first communication port and is connected between the first piston block 5 and the first pressure plug 8, the first spring 6 is sleeved on the first transmission rod 7, one end of the first spring 6 is connected with the first partition wall, and the other end is connected with the first piston block 5, used for resetting the first piston block 5 and the first pressure plug 8.

[0061] Optionally, a second partition wall is arranged between the second injection cavity 3 and the second air pressure chamber 14, and a second communication port is arranged on the second partition wall to communicate the second injection cavity 3 and the second air pressure chamber 14.

[0062] The second piston group comprises a second piston block 10, a second spring 11, a second transmission rod 12 and a second pressure plug 13. The second piston block 10 is arranged in the second injection cavity 3, the second pressure plug 13 is arranged in the second air pressure chamber 14, the second transmission rod 12 passes through the second communication port and is connected between the second piston block 10 and the second pressure plug 13, and the second spring 11 is sleeved on the second transmission rod 12. One end of the second spring 11 is connected with the second partition wall, and the other end is connected with the second piston block 10, so as to reset the second piston block 10 and the second pressure plug 13.

[0063] In this embodiment, the first injection cavity 2 and the second injection cavity 3 are arranged in the main gun body 1, and the first piston block 5 and the second piston block 10 are arranged in the first injection cavity 2 and the second injection cavity 3 respectively. Figure 2 As shown in the accompanying drawings, when the injection of the foaming liquid is started, the two raw materials enter the main gun body 1 from the first injection cavity 2 and the second injection cavity 3 respectively. At this time, the two raw materials push the first piston block 5 and the second piston block 10 to move in the opposite direction of the raw material pressure under the action of the injection pressure, and the first spring 6 and the second spring 11 are compressed under the action of the pressure (the first spring 6 and the second spring 11 can be selected to have different elastic coefficients, so as to adapt to different proportions of injection, and increase the flexibility of the injection of the device). The movement of the first piston block 5 and the second piston block 10 drives the first transmission rod 7 and the second transmission rod 12 to move left (as shown in the accompanying drawings, towards the direction close to the first air pressure chamber 9 and the second air pressure chamber 14), at this time, the left movement of the first transmission rod 7 and the second transmission rod 12 drives the first pressure plug 8 and the second pressure plug 13 to move left to extrude the air in the first air pressure chamber 9 and the second air pressure chamber 14. Figure 2 After the injection is completed, the pressure in the first injection cavity 2 and the second injection cavity 3 decreases, at this time, the first spring 6 and the second spring 11 are reset under the action of the first spring 6 and the second spring 11. During the resetting process, the cleaning drill bit 20 is first reversed left (towards the direction close to the outlet end of the discharge cavity 4), so as to discharge the excess foaming liquid in the discharge cavity 4, thereby reducing the movement resistance of the foaming liquid in the discharge cavity 4 in the next time, and achieving the function of increasing the service life of the device.

[0064] Optionally, the end of the cleaning drill bit 20 away from the special-shaped lead screw 18 is a spiral structure.

[0065] In the embodiment, the spiral structure arranged in front end of the cleaning drill bit 20 makes the two foaming raw materials in the first injection cavity 2 and the second injection cavity 3 generate turbulence when passing through the spiral structure, so that the two foaming raw materials are mixed more uniformly, and the function of ensuring the two foaming raw materials to react more fully is achieved.

[0066] In addition, the application further provides an anti-blocking foaming gun head.

[0067] Since the technical improvement and the technical effects of the super-low-temperature refrigerator are the same as those of the anti-blocking foaming gun head, the technical effects of the super-low-temperature refrigerator will not be described in detail.

[0068] The terms "first", "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features.

[0069] Although the application is disclosed as above, the protection scope of the application is not limited to this. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the application, and these changes and modifications will fall within the protection scope of the application.

Claims

1. A clog resistant foaming lance tip, characterized by, The utility model relates to a double-chamber injection molding machine, which comprises a main gun body (1) with a first injection chamber (2), a second injection chamber (3) and a discharge chamber (4) arranged in the interior of the main gun body (1) in a spaced-apart manner, and the discharge chamber (4) is located between the first injection chamber (2) and the second injection chamber (3), a first discharge port (24) is arranged between the discharge chamber (4) and the first injection chamber (2) to communicate with each other, and a second discharge port (25) is arranged between the discharge chamber (4) and the second injection chamber (3) to communicate with each other; a first air pressure chamber (9) and a second air pressure chamber (14) are arranged in the interior of the main gun body (1) in a spaced-apart manner, the first air pressure chamber (9) communicates with the first injection chamber (2), and the second air pressure chamber (14) communicates with the second injection chamber (3); a first piston group is partially arranged in the first injection chamber (2) and partially arranged in the first air pressure chamber (9), and the first piston group is used for discharging air in the first air pressure chamber (9); a second piston group is partially arranged in the second injection chamber (3) and partially arranged in the second air pressure chamber (14), and the second piston group is used for discharging air in the second air pressure chamber (14); an operation chamber is arranged in the interior of the main gun body (1) and coaxially arranged with the discharge chamber (4) and communicated with each other, an air pressure channel (15) is arranged in the interior of the main gun body (1), one end of the air pressure channel (15) respectively communicates with the first air pressure chamber (9) and the second air pressure chamber (14), and the other end of the air pressure channel (15) communicates with the operation chamber; ​ The cleaning mechanism comprises a reciprocating driving mechanism arranged in the operation cavity and a cleaning drill bit (20) arranged in the discharge cavity (4). When air inside the first air pressure chamber (9) and the second air pressure chamber (14) is discharged, the generated air pressure is used to reach the position of the reciprocating driving mechanism through the air pressure channel (15). The reciprocating driving mechanism is used to drive the cleaning drill bit (20) to reciprocate under the action of the air pressure. In the process of moving towards the opening direction of the discharge cavity (4), the cleaning drill bit (20) is used to block the first discharge port (24) and the second discharge port (25). When moving away from the opening direction of the discharge cavity (4), the cleaning drill bit (20) moves to the first discharge port (24) and the second discharge port (25) which are not blocked.

2. The anti-clogging foaming lance head of claim 1, wherein, The length of the positive helical section (19a) is less than the length of the reverse helical section (19c).

3. The anti-clogging foaming lance tip of claim 1, wherein, One end of the special-shaped lead screw (18) is provided with a dovetail pin, the inside of the cleaning drill bit (20) is provided with a dovetail groove (22), the dovetail pin is used for sliding connection with the dovetail groove (22), and the length of the dovetail groove (22) is equal to the longest distance of the movement of the screw block (23) in the positive helical section (19a) and the reverse helical section (19c).

4. The anti-clogging foaming lance tip of claim 1, wherein, The inner wall of the operation cavity is provided with a limiting groove (21) extending along the axial direction of the profiled screw rod (18) for limiting the screw block (23), and the length of the limiting groove (21) is greater than the shortest distance from the cleaning drill bit (20) to the outlet end of the discharge cavity (4) at the initial time.

5. The anti-clogging foaming lance tip of claim 1, wherein, The first injection cavity (2) and the first gas pressure chamber (9) are provided with a first partition wall, and the first partition wall is provided with a first communication port for connecting the first injection cavity (2) and the first gas pressure chamber (9); The first piston group includes a first piston block (5), a first spring (6), a first transmission rod (7), and a first pressure plug (8). The first piston block (5) is arranged in the first injection cavity (2), the first pressure plug (8) is arranged in the first gas pressure chamber (9), the first transmission rod (7) passes through the first communication port and is connected between the first piston block (5) and the first pressure plug (8), and the first spring (6) is sleeved on the first transmission rod (7). One end of the first spring (6) is connected with the first partition wall, and the other end is connected with the first piston block (5), for resetting the first piston block (5) and the first pressure plug (8).

6. The anti-clogging foaming lance tip of claim 1, wherein, The second injection cavity (3) and the second gas pressure chamber (14) are provided with a second partition wall, and the second partition wall is provided with a second communication port for connecting the second injection cavity (3) and the second gas pressure chamber (14). The second piston group includes a second piston block (10), a second spring (11), a second transmission rod (12), and a second pressure plug (13). The second piston block (10) is arranged in the second injection cavity (3), the second pressure plug (13) is arranged in the second gas pressure chamber (14), the second transmission rod (12) passes through the second communication port and is connected between the second piston block (10) and the second pressure plug (13), and the second spring (11) is sleeved on the second transmission rod (12). One end of the second spring (11) is connected with the second partition wall, and the other end is connected with the second piston block (10), for resetting the second piston block (10) and the second pressure plug (13).

7. The anti-clogging foaming lance tip of claim 1, wherein, The end of the cleaning drill bit (20) away from the profiled screw rod (18) is a spiral structure.

8. An ultra-low temperature freezer, characterized by, A clog-resistant foaming lance tip as claimed in any one of claims 1 to 7. A clog-resistant foaming lance tip as claimed in any one of claims 1 to 7.

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