Bending machine for U-shaped large coaming of freezer liner

Abstract

The invention relates to the technical field of freezer machining, and discloses a freezer liner U-shaped large coaming bending machine which comprises a machine base and a bending assembly, the bending assembly comprises a driving part arranged at the top of the machine base, a lifting plate is arranged at the telescopic end of the driving part, an upper die is arranged at the bottom of the lifting plate, and a lower die is arranged on a working table of the machine base. The linear sliding rails are symmetrically arranged on the outer wall of the machine base; the sliding blocks are arranged on the two sides of the lifting plate and connected to the inner sides of the linear sliding rails in a sliding mode. According to the bending machine for the U-shaped large coaming of the freezer liner, the self-lubricating mechanism and the liquid guide mechanism work cooperatively, when the driving piece drives the lifting plate and the upper die to be close to a plate, the self-lubricating mechanism can quantitatively provide lubricating liquid for the liquid guide mechanism, the liquid guide mechanism can guide the lubricating liquid to the surface of the upper die, a lubricating film is automatically formed before bending every time, manual smearing is not needed, and the working efficiency is improved. Troubles of manual operation are reduced, and production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of freezer processing, and particularly relates to a bending machine for the U-shaped large side panel of a freezer inner liner. Background Art

[0002] The side panel is an important part of the freezer inner liner, which is integrally U-shaped and surrounds the sides and bottom inside the freezer to form a relatively enclosed space, providing a stable installation environment for the refrigeration system of the freezer and also providing a regular space for storing items.

[0003] The side panel is usually made by bending a specific plastic or metal sheet one or two times. During the bending process, due to setting parameters such as the pressure or speed of the bending machine, it is easy to cause wear grooves due to high friction in the contact area between the punching head (upper die) and the sheet. Especially after the protective layers such as the hard chromium plating layer and ceramic coating on the surface of the metal die are damaged, it further exacerbates the thermal deformation and stress concentration of the sheet and shortens the die life. Therefore, before each bending, it is necessary to manually pre-apply a lubricant on the surface of the upper die or the sheet to form a lubricating film to reduce equipment loss and improve the yield rate of the sheet. However, each application operation is rather troublesome and affects the production efficiency. Summary of the Invention

[0004] Aiming at the above-mentioned shortcomings of the prior art, the present invention provides a bending machine for the U-shaped large side panel of a freezer inner liner, which can effectively solve the problem in the prior art that before each bending, it is necessary to manually pre-apply a lubricant on the surface of the upper die or the sheet to form a lubricating film, but each application operation is rather troublesome and affects the production efficiency.

[0005] Technical Solution To achieve the above object, the present invention is realized through the following technical solutions: The present invention provides a bending machine for the U-shaped large side panel of a freezer inner liner, including a machine base and a bending assembly. The bending assembly includes a driving member arranged on the top of the machine base. The telescopic end of the driving member is provided with a lifting plate. The bottom of the lifting plate is provided with an upper die. The working surface of the machine base is provided with a lower die. It further includes: Linear guide rails, which are symmetrically arranged on the outer wall of the machine base; Sliders, which are arranged on both sides of the lifting plate and are slidably connected to the inner side of the linear guide rails; A liquid guiding mechanism, which is used to guide the lubricating liquid to the surface of the upper die and guide the lubricating liquid between the linear guide rails and the sliders; A self-lubricating mechanism, which is used to quantitatively supply the lubricating liquid to the liquid guiding mechanism; Wherein, when the driving member drives the lifting plate, that is, each time the upper die approaches the sheet placed on the lower die, the self-lubricating mechanism quantitatively supplies the liquid guiding mechanism with a lubricating liquid once.

[0006] Further, the self-lubricating mechanism includes a liquid storage tank provided on the side wall of the machine base. The top of the liquid storage tank is provided with a liquid inlet column, and the liquid inlet column is communicated with the inner cavity of the liquid storage tank through a liquid suction pipe at the bottom. A liquid extraction pipe is slidably arranged inside the liquid inlet column.

[0007] Further, a first one-way valve is arranged between the liquid inlet column and the liquid suction pipe. The bottom end of the liquid suction pipe is provided with a pressing cover, and a second one-way valve is arranged inside the pressing cover; The liquid flow directions in the first one-way valve and the second one-way valve are both unidirectional upward.

[0008] Further, the diameter of the pressing cover is adapted to the inner diameter of the liquid inlet column, and a reset member is arranged between the outer wall of the pressing cover and the inner bottom wall of the liquid inlet column; The reset member is in an initial state when the upper die does not move downward, and the reset member is in a compressed state when the upper die moves downward.

[0009] Further, a liquid filling port for adding lubricating liquid is arranged on the outer wall of the liquid storage tank, and the lubricating liquid is a water-based lubricant.

[0010] Further, a magnetic disk is arranged at the top end of the liquid extraction pipe, and a magnetic attraction block is arranged at the top end of the slider, and the magnetic attraction block and the magnetic disk are magnetically attracted to each other.

[0011] Further, the liquid guiding mechanism includes a sponge strip arranged on the outer wall of the upper die through a fixing plate. Liquid outlet holes are formed at both ends of the fixing plate, and the liquid outlet holes are communicated with the top end of the liquid extraction pipe through a first liquid outlet pipe.

[0012] Further, a second liquid outlet pipe is communicated with the first liquid outlet pipe, and the end of the second liquid outlet pipe away from the first liquid outlet pipe leads to the contact surface between the linear slide rail and the slider.

[0013] Further, the liquid guiding mechanism further includes a diversion slope arranged on the working surface of the machine base, and the diversion slope is located on both sides of the lower die. A liquid receiving box is arranged on one side of the diversion slope.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In the present invention, the self-lubricating mechanism and the liquid guiding mechanism work together. When the driving member drives the lifting plate and the upper die to approach the plate, the self-lubricating mechanism can quantitatively provide lubricating liquid for the liquid guiding mechanism, and the liquid guiding mechanism will guide the lubricating liquid to the surface of the upper die, automatically forming a lubricating film before each bending. In this way, manual application is not required, the trouble of manual operation is reduced, and the production efficiency is improved.

[0015] 2. In the present invention, when the downward pressure on the lower pressing cover is lost, the reset member returns to its original state under the action of its own elastic force, pushing the lower pressing cover to move upward and return to the initial position. At this time, under the action of negative pressure, the first one-way valve opens, and the lubricating fluid in the liquid storage tank flows into the space below the lower pressing cover again, preparing for the next liquid suction action. The first one-way valve prevents the liquid above the liquid inlet column from flowing back into the liquid storage tank, ensuring that a fixed amount of lubricating fluid can be accurately extracted from the liquid storage tank each time the bending operation is performed.

[0016] 3. In the present invention, the lubricating fluid penetrates into the sponge strip through the liquid outlet holes at both ends of the fixing plate. The sponge strip adsorbs and stores the lubricating fluid by virtue of its porous structure, and under the action of gravity, the lubricating fluid seeps out and flows to the bottom of the upper die, forming a continuous lubricating film, effectively reducing the friction coefficient between the upper die and the plate and reducing wear. On the other hand, part of the lubricating fluid is transported to the contact surface between the linear slide rail and the slider through the second liquid outlet pipe, and the continuously moving slider distributes the transported lubricating fluid evenly on the entire contact surface, ensuring the smooth movement of the lifting plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 It is a schematic diagram of the structure of the driving member of an embodiment of the present invention; Figure 3 It is a schematic diagram of the structure of the lifting plate of an embodiment of the present invention; Figure 4 It is a schematic diagram of the structure of the liquid storage tank of an embodiment of the present invention; Figure 5 It is a schematic diagram of the partial cross-sectional structure of an embodiment of the present invention; Figure 6 It is Figure 4 a schematic diagram of the locally enlarged structure at B in Figure 7 It is Figure 1 a schematic diagram of the locally enlarged structure at A in

[0019] The reference numerals in the figure respectively represent: 100, the machine base; 200, the bending assembly; 201, the driving member; 202, the lifting plate; 203, the upper die; 204, the lower die; 300, the linear slide rail; 400, the slider; 500, the liquid guiding mechanism; 501, the fixing plate; 502, the sponge strip; 503, the first liquid outlet pipe; 504, the second liquid outlet pipe; 505, the liquid receiving box; 600, the self-lubricating mechanism; 601, the liquid storage tank; 602, the liquid inlet column; 603, the liquid suction pipe; 604, the liquid extraction pipe; 605, the first one-way valve; 606, the lower pressing cover; 607, the second one-way valve; 608, the reset member; 609, the magnetic disk; 610, the magnetic attraction block. Detailed implementation manners

[0020] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0021] The present invention will be further described below with reference to the embodiments.

[0022] Embodiment 1, referring to Figures 1 - 7 , which is the first embodiment of the present invention, provides a U-shaped large gusset bending machine for the inner liner of a freezer, including a machine base 100 and a bending assembly 200. The bending assembly 200 includes a driving member 201 fixedly installed on the top of the machine base 100. The telescopic end of the driving member 201 is fixedly installed with a lifting plate 202, and the bottom of the lifting plate 202 is fixedly installed with an upper die 203. A lower die 204 is fixedly installed on the working surface of the machine base 100.

[0023] Specifically, the driving member 201 can be a hydraulic cylinder (the number is selected according to the actual situation), which can provide a large driving force, can adapt to the bending requirements of plates with different thicknesses and materials; has stable movement, can control the descending speed and position of the upper die 203 to ensure the bending accuracy; has strong overload protection ability. When encountering a large resistance, the hydraulic system can unload through devices such as an overflow valve to avoid equipment damage; the driving member 201 can also be an electric push rod, which has a simple structure and is convenient for installation and maintenance; the stroke and speed of the push rod can be accurately controlled by controlling the forward and reverse rotation and speed of the motor; it has less noise and little impact on the working environment, and is generally applicable to the bending of small and light plates.

[0024] The surrounding plate is usually made by bending a specific plastic or metal plate one or two times. During the bending process, due to the setting parameters such as the pressure or speed of the bending assembly 200, it is easy to cause wear grooves due to high friction in the contact area between the upper die 203 and the plate. Especially after the protective layers such as the hard chromium plating layer and ceramic coating on the surface of the metal die are damaged, it further exacerbates the thermal deformation and stress concentration of the plate, and shortens the die life. Therefore, before each bending, it is necessary to manually pre-apply a lubricant on the surface of the upper die 203 or the plate to form a lubricating film, so as to reduce equipment loss and improve the yield rate of the plate. However, each application operation is rather troublesome and affects production efficiency.

[0025] The present invention further includes: linear guide rails 300 symmetrically arranged on the outer wall of the machine base 100; sliders 400 arranged on both sides of the lifting plate 202 and slidably connected to the inner side of the linear guide rails 300; a liquid guiding mechanism 500 for guiding the lubricating liquid to the surface of the upper die 203 and guiding the lubricating liquid between the linear guide rails 300 and the sliders 400; and a self-lubricating mechanism 600 for quantitatively providing the lubricating liquid for the liquid guiding mechanism 500.

[0026] Among them, when the driving member 201 drives the lifting plate 202, that is, during the process of the upper die 203 approaching the plate placed on the lower die 204 each time, the self-lubricating mechanism 600 quantitatively provides a lubricating liquid for the liquid guiding mechanism 500 once.

[0027] Specifically, the self-lubricating mechanism 600 and the liquid guiding mechanism 500 work together. When the driving member 201 drives the lifting plate 202 and the upper die 203 to approach the plate, the self-lubricating mechanism 600 can quantitatively provide the lubricating liquid for the liquid guiding mechanism 500. The liquid guiding mechanism 500 will guide the lubricating liquid to the surface of the upper die 203 and automatically form a lubricating film before each bending. In this way, there is no need for manual application, reducing the trouble of manual operation and improving production efficiency.

[0028] At the same time, the liquid guiding mechanism 500 not only guides the lubricating liquid to the surface of the upper die 203, but also can guide the lubricating liquid between the linear guide rails 300 and the sliders 400. During the process of the driving member 201 driving the lifting plate 202 to move, the slider 400 slides inside the linear guide rail 300, and at this time, it obtains lubrication synchronously, ensuring the smooth movement of the lifting plate 202, reducing the wear between the linear guide rail 300 and the slider 400, and improving the overall operation stability and reliability of the equipment.

[0029] Specifically, the liquid guiding mechanism 500 and the self-lubricating mechanism 600 can be composed of a lubricating liquid storage tank, a quantitative pumping unit, a control valve and a pipeline. The lubricating liquid storage tank is installed on the side wall or the non-moving area on the top of the machine base 100, and the quantitative pumping unit (quantitative liquid supply is achieved through a solenoid valve or a micro gear pump) is set at the bottom outlet of the storage tank, fixed on the machine base 100 through a bracket, and the pump outlet is connected to a flexible pressure-resistant pipe, which is routed along the inside of the frame of the machine base 100 to the upper mold 203 and the inner side of the linear slide 300, and the control valve (such as a solenoid valve) is opened and closed through the telescopic signal of the driving member 201.

[0030] Example 2, reference Figures 1 - 7 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: the self-lubricating mechanism 600 includes a liquid storage tank 601 installed on the side wall of the machine base 100 through a support plate, a liquid inlet column 602 is fixedly installed or welded on the top of the liquid storage tank 601, the liquid inlet column 602 is connected to the inner cavity of the liquid storage tank 601 through a liquid suction pipe 603 connected to its bottom, and a liquid extraction pipe 604 is slidably arranged on the inner side of the liquid inlet column 602; a first one-way valve 605 is installed between the liquid inlet column 602 and the liquid suction pipe 603, a lower pressure cover 606 is fixedly installed at the bottom of the liquid suction pipe 603, and a second one-way valve 607 is installed in the lower pressure cover 606; the liquid flow direction in the first one-way valve 605 and the second one-way valve 607 is both one-way upward.

[0031] Specifically, when the liquid extraction tube 604 moves upward in the liquid inlet column 602, a negative pressure environment is formed inside the liquid inlet column 602. Based on the negative pressure principle, the lubricating liquid in the liquid storage tank 601 is sucked into the liquid inlet column 602 through the second one-way valve 607 and the first one-way valve 605 in sequence under the action of the external atmospheric pressure. When the liquid extraction tube 604 moves downward, the pressure in the liquid inlet column 602 increases, and the lubricating liquid is squeezed out of the liquid inlet column 602, and then transported to the liquid guide mechanism 500 through the liquid extraction tube 604, thereby realizing the function of providing lubricating liquid to the part that needs lubrication.

[0032] Specifically, the first one-way valve 605 and the second one-way valve 607 can both be ball one-way valves, which are composed of a valve body, a valve core (steel ball), a valve seat, a spring and other components. When liquid flows in from a specified direction, the liquid pressure pushes the steel ball away from the valve seat, so that the channel opens and the liquid passes smoothly. When the liquid tries to flow in the opposite direction, the steel ball fits tightly on the valve seat under the action of the spring force and the reverse pressure, preventing the liquid from flowing back. In the self-lubricating mechanism 600, when the first one-way valve 605 and the second one-way valve 607 are ball one-way valves, they can better adapt to pressure changes in different directions, ensuring that the lubricating liquid in the liquid storage tank 601 can only flow upward in one direction, preventing the lubricating liquid from flowing back when not needed.

[0033] Reference Figure 5, the diameter of the lower pressing cover 606 is adapted to the inner diameter of the liquid inlet column 602, and a reset member 608 is provided between the outer wall of the lower pressing cover 606 and the inner bottom wall of the liquid inlet column 602; the reset member 608 is in an initial state when the upper die 203 does not move downward, and the reset member 608 is in a compressed state when the upper die 203 moves downward.

[0034] Specifically, the reset member 608 is preferably a compression spring that can withstand axial compressive force, which facilitates the lower pressing cover 606 to automatically reset under the elastic action of the reset member 608 when the downward pressure is lost after the lower pressing cover 606 moves downward with the liquid extraction tube 604.

[0035] Specifically, when the upper die 203 does not move downward, the reset member 608 is in an initial state. At this time, the lower pressing cover 606 is located at a relatively high position inside the liquid inlet column 602. A certain distance is maintained between the lower pressing cover 606 and the inner bottom wall of the liquid inlet column 602.

[0036] When the driving member 201 drives the upper die 203 to move downward, it drives the liquid extraction tube 604 to slide downward inside the liquid inlet column 602; the downward movement of the liquid extraction tube 604 will squeeze the lower pressing cover 606, causing the lower pressing cover 606 to move downward against the elastic force of the reset member 608, and the reset member 608 is compressed; the downward movement of the lower pressing cover 606 will squeeze the lubricating liquid in the space below it. Since the second one-way valve 607 prevents the liquid from flowing downward, the lubricating liquid will enter the liquid extraction tube 604 through the second one-way valve 607 and then lead to the subsequent liquid outlet pipe, realizing the function of quantitatively providing lubricating liquid for the liquid guiding mechanism 500.

[0037] When the downward pressure on the lower pressing cover 606 is lost, the reset member 608 returns to its original state under its own elastic force, pushing the lower pressing cover 606 to move upward and return to the initial position; at this time, under the negative pressure, the first one-way valve 605 opens, and the lubricating liquid in the liquid storage tank 601 flows into the space below the lower pressing cover 606 again, preparing for the next liquid suction action. The first one-way valve 605 prevents the liquid in the upper part of the liquid inlet column 602 from flowing back to the liquid storage tank 601, ensuring that a quantitative amount of lubricating liquid can be accurately extracted from the liquid storage tank 601 every time the bending operation is performed.

[0038] Refer to Figure 4 , a liquid filling port for adding lubricating liquid is provided on the outer wall of the liquid storage tank 601, and the liquid filling port is sealed with a cover body, and the lubricating liquid is a water-based lubricant.

[0039] Specifically, when the water-based lubricant is stored in the sponge strip 502, it uniformly penetrates to the surface of the upper die 203 by virtue of its low surface tension, forming an ultra-thin lubricating film, which effectively reduces the friction coefficient between the upper die 203 and the plate. The residual lubricant after bending can flow into the subsequent liquid receiving box 505 through the diversion inclined plane for recycling, or be directly rinsed with water in the subsequent cleaning process, avoiding the problem that it is difficult to remove the oil-based lubricant and reducing the manual cleaning cost. At the same time, the low volatility of the water-based lubricant results in a very low loss rate when it is stored in the liquid storage tank 601. Combined with the quantitative extraction design of the self-lubricating mechanism 600, it avoids waste while its good fluidity makes the negative pressure liquid suction process smoother. Through the control of the first one-way valve 605 and the second one-way valve 607, it can quickly fill the cavity of the liquid inlet column 602 to ensure the immediate lubrication requirement during high-speed bending.

[0040] Referring to Figure 7 , the liquid guiding mechanism 500 includes a sponge strip 502 fixedly installed on the outer wall of the upper die 203 through a fixing plate 501. Liquid outlet holes are opened at both ends of the fixing plate 501, and the liquid outlet holes are communicated with the top end of the liquid extraction pipe 604 through a first liquid outlet pipe 503. A second liquid outlet pipe 504 is communicated with the first liquid outlet pipe 503, and the end of the second liquid outlet pipe 504 away from the first liquid outlet pipe 503 leads to the contact surface between the linear slide rail 300 and the slider 400. Both the first liquid outlet pipe 503 and the second liquid outlet pipe 504 are made of flexible hose material.

[0041] Specifically, when the pressurized lubricating liquid enters the first liquid outlet pipe 503 through the top of the liquid extraction pipe 604. On the one hand, the lubricating liquid penetrates into the sponge strip 502 through the liquid outlet holes at both ends of the fixing plate 501. The sponge strip 502 adsorbs and stores the lubricating liquid by virtue of its porous structure and oozes out the lubricating liquid under the action of gravity to flow to the bottom of the upper die 203, forming a continuous lubricating film, effectively reducing the friction coefficient between the upper die 203 and the plate and reducing wear. On the other hand, part of the lubricating liquid is transported to the contact surface between the linear slide rail 300 and the slider 400 through the second liquid outlet pipe 504. The continuously moving slider 400 evenly distributes the transported lubricating liquid on the entire contact surface, ensuring the smooth movement of the lifting plate 202. It not only reduces the wear between the linear slide rail 300 and the slider 400, extends their service life, but also improves the stability and reliability of the overall operation of the equipment. The remaining structure is the same as that of Embodiment 1.

[0042] Embodiment 3, referring to Figure 2 、 Figure 5 and Figure 6 , which is the third embodiment of the present invention. The difference between this embodiment and the second embodiment is that a magnetic disk 609 is fixedly installed at the top end of the liquid extraction pipe 604, and the diameter of the magnetic disk 609 is larger than the outer diameter of the liquid inlet column 602. A magnetic attraction block 610 is fixedly installed at the top end of the slider 400, and the magnetic attraction block 610 is magnetically attracted to the magnetic disk 609.

[0043] Specifically, when the driving member 201 drives the upper die 203 to move downward, the sliders 400 on both sides of the lifting plate 202 will slide downward synchronously inside the linear slide rail 300. Since the magnetic attraction block 610 and the magnetic disk 609 are magnetically attracted, the magnetic attraction block 610 will also drive the magnetic disk 609 to move downward accordingly. When the magnetic disk 609 moves to its lowest position, as the magnetic attraction block 610 continues to move, the magnetic disk 609 disengages from the magnetic connection with the magnetic attraction block 610, and thus automatically resets under the action of the reset member 608.

[0044] Refer to Figure 2 , the liquid guiding mechanism 500 further includes a guiding inclined surface provided on the working surface of the machine base 100, and the guiding inclined surface is located on both sides of the lower die 204. A liquid receiving box 505 is provided on one side of the guiding inclined surface.

[0045] Specifically, when too much lubricating liquid remains on the upper die 203 from the sponge strip 502, under the action of gravity, the excess lubricating liquid drips onto the lower die 204 through the upper die 203 and flows along the grooves of the lower die 204 to the liquid receiving boxes 505 on both sides, which is convenient for recycling and reduces production losses. The remaining structure is the same as that of Embodiment 2.

[0046] Embodiment 4, refer to Figure 5 and Figure 6 , which is the fourth embodiment of the present invention. The difference between this embodiment and the second embodiment is that the reset member 608 is rotatably provided at the bottom of the lower pressing cover 606, and a plurality of adjusting grooves (as shown in Figure 6 ) can be arranged in an annular array on the wall of the liquid inlet column 602, and the depths of the plurality of adjusting grooves change gradually from shallow to deep.

[0047] When the diameter of the magnetic disk 609 is less than or equal to the minimum inner diameter of the liquid inlet column 602, that is, the moving distance of the magnetic disk 609 downward is extended. In cooperation with the adjusting grooves (the width of the adjusting grooves is greater than the diameter of the first liquid outlet pipe 503), the moving distance of the magnetic disk 609 can be adjusted by rotating the magnetic disk 609, so as to increase or decrease the amount of lubricating liquid discharged each time.

[0048] Specifically, when the magnetic disk 609 and the first liquid outlet pipe 503 move downward, they can penetrate into the adjusting grooves of different depths. When the magnetic disk 609 is stuck in a shallower adjusting groove, the downward moving distance of the lower pressing cover 606 is smaller, and the volume of the lubricating liquid compressed in the liquid storage tank 601 is less, and the amount of lubricating liquid output through the liquid suction pipe 604 decreases accordingly; on the contrary, when the magnetic disk 609 is stuck in a deeper adjusting groove, the lower pressing cover 606 can move downward a greater distance, squeezing more lubricating liquid into the liquid suction pipe 604, thereby increasing the single - time liquid output volume, which can meet the differential lubrication requirements when bending plates of different materials and thicknesses, avoid the situation of waste or shortage of lubricating liquid, and further improve the practicability and production efficiency of the equipment. The remaining structure is the same as that of Embodiment 3.

[0049] Combining Embodiments 1 - 3, the working principle of the present invention is as follows: Place the sheet on the lower die 204. When the driving member 201 drives the upper die 203 to move downward, since the magnetic attraction block 610 and the magnetic disk 609 are magnetically attracted, the magnetic attraction block 610 will also drive the magnetic disk 609 to move downward accordingly. Thus, the liquid extraction tube 604 drives the pressing cover 606 to squeeze the lubricating liquid in the space below it, and the reset member 608 is compressed. The lubricating liquid will enter the liquid extraction tube 604 through the second one-way valve 607 and then lead to the first liquid outlet pipe 503 and the second liquid outlet pipe 504, so that the lubricating liquid flows to the bottom of the upper die 203 and between the contact surfaces of the linear slide rail 300 and the slider 400.

[0050] As the magnetic attraction block 610 continues to move, the magnetic disk 609 disengages from the magnetic connection with the magnetic attraction block 610, and thus automatically resets under the action of the reset member 608 to push the pressing cover 606 to move upward and return to the initial position; at this time, under the negative pressure, the first one-way valve 605 opens, and the lubricating liquid in the liquid storage tank 601 flows into the space below the pressing cover 606 again to prepare for the next liquid suction action. The first one-way valve 605 prevents the liquid in the upper part of the liquid inlet column 602 from flowing back to the liquid storage tank 601, ensuring that a fixed amount of lubricating liquid can be accurately extracted from the liquid storage tank 601 each time the bending operation is performed.

[0051] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A U-shaped large enclosure bending machine for the inner liner of a freezer, comprising a machine base (100) and a bending assembly (200). The bending assembly (200) includes a driving member (201) arranged on the top of the machine base (100). The telescopic end of the driving member (201) is provided with a lifting plate (202). A upper die (203) is arranged at the bottom of the lifting plate (202). A lower die (204) is arranged on the workbench surface of the machine base (100), and it is characterized in that, Further included are: Linear slide rails (300), symmetrically arranged on the outer wall of the machine base (100); Sliders (400), arranged on both sides of the lifting plate (202) and slidably connected to the inner side of the linear slide rails (300); Liquid guiding mechanism (500), used to guide the lubricating liquid to the surface of the upper die (203) and to the space between the linear slide rails (300) and the sliders (400); Self-lubricating mechanism (600), used to quantitatively supply lubricating liquid to the liquid guiding mechanism (500); Wherein, when the driving member (201) drives the lifting plate (202), that is, every time the upper die (203) approaches the plate placed on the lower die (204), the self-lubricating mechanism (600) quantitatively supplies lubricating liquid to the liquid guiding mechanism (500) once.

2. The U-shaped large perimeter plate bending machine for the inner liner of a freezer according to claim 1, wherein The self-lubricating mechanism (600) includes a liquid storage tank (601) arranged on the side wall of the machine base (100). The top of the liquid storage tank (601) is provided with a liquid inlet column (602). The liquid inlet column (602) is connected to the inner cavity of the liquid storage tank (601) through a liquid suction pipe (603) at the bottom. A liquid extraction pipe (604) is slidably arranged inside the liquid inlet column (602).

3. The U-shaped large perimeter plate bending machine for the inner liner of a freezer according to claim 2, characterized in that, A first one-way valve (605) is arranged between the liquid inlet column (602) and the liquid suction pipe (603). The bottom end of the liquid suction pipe (603) is provided with a pressing cover (606), and a second one-way valve (607) is arranged inside the pressing cover (606); The liquid flow directions in the first one-way valve (605) and the second one-way valve (607) are both unidirectional upward.

4. The U-shaped large perimeter panel bending machine for the inner liner of a freezer according to claim 3, characterized in that, The diameter of the pressing cover (606) is adapted to the inner diameter of the liquid inlet column (602). A reset member (608) is arranged between the outer wall of the pressing cover (606) and the inner bottom wall of the liquid inlet column (602); The reset member (608) is in an initial state when the upper die (203) does not move downward, and is in a compressed state when the upper die (203) moves downward.

5. The U-shaped large perimeter panel bending machine for the inner liner of a freezer according to claim 3, characterized in that, A liquid filling port for adding lubricating liquid is arranged on the outer wall of the liquid storage tank (601), and the lubricating liquid is a water-based lubricant.

6. The U-shaped large perimeter plate bending machine for the inner liner of a freezer according to claim 5, characterized in that, The top end of the liquid extraction pipe (604) is provided with a magnetic disk (609). The top end of the slider (400) is provided with a magnetic attraction block (610), and the magnetic attraction block (610) is magnetically attracted to the magnetic disk (609).

7. The U-shaped large perimeter plate bending machine for the inner liner of a freezer according to claim 2, wherein The liquid guiding mechanism (500) includes a sponge strip (502) arranged on the outer wall of the upper die (203) through a fixing plate (501). Liquid outlet holes are opened at both ends of the fixing plate (501), and the liquid outlet holes are connected to the top end of the liquid extraction pipe (604) through a first liquid outlet pipe (503).

8. The U-shaped large perimeter plate bending machine for the inner liner of a freezer according to claim 7, characterized in that, A second liquid outlet pipe (504) is connected to the first liquid outlet pipe (503). The end of the second liquid outlet pipe (504) away from the first liquid outlet pipe (503) leads to the contact surface between the linear slide rail (300) and the slider (400).

9. The U-shaped large perimeter panel bending machine for the freezer inner liner according to claim 7, characterized in that, The liquid guiding mechanism (500) further includes a diversion inclined plane arranged on the workbench surface of the machine base (100), and the diversion inclined plane is located on both sides of the lower die (204), and a liquid receiving box (505) is arranged on one side of the diversion inclined plane.

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