Leather waxing machine

Abstract

The leather waxing machine of the present invention includes a leather placement platform and a wax heating box. The wax heating box is connected to a wax pump assembly. A waxing brush and a brush driving mechanism are provided on the leather placement platform. The wax outlet of the wax pump assembly extends to the waxing brush. The leather waxing machine also includes a reflux assembly, a reflux driving mechanism, and a pumping assembly. After waxing with this leather waxing machine, before changing the leather, the reflux driving mechanism drives the liquid inlet of the reflux assembly to move below the wax outlet of the wax pump assembly. The reflux assembly receives the wax discharged from the wax outlet and guides it back to the wax heating box. Therefore, when changing the leather, the wax from the wax pump assembly is less likely to drip onto the leather placement platform, thus reducing the risk of contamination. The pumping assembly pumps air from the liquid outlet of the reflux assembly to the liquid inlet. The gas can conduct heat from the liquid outlet of the reflux assembly to the liquid inlet, causing the liquid inlet to heat up and reducing the possibility of the wax solidifying upon contact with cold air when it falls from the wax outlet of the wax pump assembly to the liquid inlet of the reflux assembly.

Description

Technical Field

[0001] This invention relates to the field of leather waxing technology, and more specifically to a leather waxing machine. Background Technology

[0002] The leather waxing machine includes a leather placement table and a wax heating chamber. The wax heating chamber is connected to a wax pump assembly. The leather placement table has a waxing brush and a brush drive mechanism that drives the brush. The wax pump assembly's wax outlet extends to the waxing brush. During waxing, the leather to be waxed is placed on the leather placement table. The wax heating chamber heats the solid wax into liquid wax. The wax pump assembly draws liquid wax from the heating chamber and pumps it to the waxing brush, allowing the liquid wax to fall onto the leather surface. The brush drive mechanism drives the waxing brush to repeatedly brush the leather surface, spreading the wax liquid and applying it evenly. After waxing is complete, the wax pump assembly and brush drive mechanism are usually stopped, the waxed leather is replaced with the next piece of leather to be waxed, and then the wax pump assembly and brush drive mechanism are restarted to wax the next piece of leather. However, after the wax pump assembly stops, residual wax inside can easily drip onto the leather placement table, causing contamination. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a leather waxing machine, which, when the leather is changed after waxing, prevents the wax liquid from the pumping component from dripping onto the leather placement table.

[0004] The inventors initially experimented with adding a wax baffle to the leather waxing machine. When changing leather, the wax pump assembly stopped working, and the wax baffle moved to the wax outlet of the pump assembly to block residual wax and prevent dripping. After changing the leather, the pump assembly restarted, and the wax baffle moved away from the wax outlet to allow normal wax dispensing. However, it was found that after the pump assembly stopped working, residual wax inside could not drain properly and remained at the wax baffle. Upon cooling and solidification, this wax easily adhered to the baffle, affecting its normal movement. The inventors then further improved the machine by replacing the wax baffle with a return flow assembly, whose outlet was connected to a wax heating chamber. When changing leather, the inlet of the return flow assembly moved below the wax outlet of the pump assembly to receive the wax discharged from the outlet and guide it back into the wax heating chamber. After practical testing, it was found that because the wax outlet of the wax pump assembly and the liquid inlet of the reflux assembly are both far from the wax heating chamber, some of the wax solidifies upon cooling when it flows from the wax outlet of the wax pump assembly to the liquid inlet of the reflux assembly. The inventors realized that the liquid outlet of the reflux assembly is close to the wax heating chamber and therefore has a higher temperature. If the heat from the outlet could be transferred to the inlet, the temperature of the inlet could be raised, thus reducing the possibility of the wax solidifying upon cooling. Based on this, the leather waxing machine of this invention was designed.

[0005] To solve the above-mentioned technical problems, the leather waxing machine of the present invention includes a leather placement platform and a wax heating box for heating solid wax into liquid wax. The wax heating box is connected to a wax pump assembly. A waxing brush and a brush driving mechanism connected to the waxing brush are provided on the leather placement platform. The wax outlet of the wax pump assembly extends to the waxing brush, drawing liquid wax from the wax heating box and pumping it to the waxing brush, so that the liquid wax falls onto the surface of the leather placed on the leather placement platform. The brush driving mechanism drives the waxing brush to reciprocate and brush the leather that has been coated with liquid wax. The surface also includes a reflux assembly and a reflux drive mechanism that drives the reflux assembly. The liquid inlet of the reflux assembly is located below the liquid outlet of the wax pump assembly. The liquid outlet of the reflux assembly is connected to the wax heating box. The reflux drive mechanism drives the liquid inlet of the reflux assembly to move below the wax outlet of the wax pump assembly, so that the reflux assembly receives the wax discharged from the wax outlet and guides it back to the wax heating box. It also includes an air pump assembly that pumps air from the liquid outlet of the reflux assembly to the liquid inlet, thereby conducting the heat from the liquid outlet of the reflux assembly to the liquid inlet.

[0006] Furthermore, the wax pump assembly includes a wax pump and a wax outlet pipe connected to the wax pump. The end of the wax outlet pipe extends to the wax brush. The air inlet of the pump assembly is aligned with the heat dissipation part of the wax pump. After drawing the hot air from the wax pump, it is pumped from the outlet of the return assembly to the inlet.

[0007] Furthermore, the air pump assembly includes an air pump, with an air inlet pipe connected to the air pump inlet end and an air outlet pipe connected to the air outlet end. The air outlet pipe is connected to the liquid outlet section of the return assembly. The air pump heat dissipation section is parallel to the wax pump heat dissipation section. The end of the air inlet pipe serves as the liquid inlet section of the air pump assembly. The air pump heat dissipation section is aligned with the wax pump heat dissipation section and the air pump heat dissipation section. The hot air from the wax pump and the air pump is drawn and pumped from the liquid outlet section of the return assembly to the liquid inlet section.

[0008] Furthermore, the liquid inlet of the reflux assembly is equipped with a receiving plate to receive the wax discharged from the wax outlet. A reflux pipe is connected to the receiving plate, and the end of the reflux pipe is located at the liquid outlet of the reflux assembly and connected to the wax heating box to guide the wax back into the wax heating box. The air outlet of the air pump assembly is connected to the end of the reflux pipe from top to bottom, and air is pumped from the end of the reflux pipe to the receiving plate to conduct the heat of the end of the reflux pipe to the receiving plate.

[0009] Furthermore, the liquid inlet of the reflux assembly is equipped with a receiving tray to receive the wax liquid discharged from the wax outlet. A reflux pipe is connected to the receiving tray, and the end of the reflux pipe is connected to the wax heating box to guide the wax liquid back into the wax heating box. A venting pipe is wrapped around the outside of the reflux pipe. The end of the reflux pipe and the end of the venting pipe together form the liquid outlet of the reflux assembly. The end of the venting pipe is connected to a pumping assembly. The pumping assembly pumps air from the end of the venting pipe to the beginning of the venting pipe, thereby indirectly transferring the heat from the end of the reflux pipe to the receiving tray via the venting pipe.

[0010] Furthermore, the receiving plate has an inclined surface that is higher at the beginning and lower at the end, and the first section of the return pipe is connected to the end of the receiving plate.

[0011] Furthermore, the receiving plate has an air chamber at its end and an air inlet leading to the air chamber. The first section of the pump pipe is connected to the air inlet at the end of the receiving plate, which guides the gas pumped by the pumping assembly into the air chamber. The air chamber extends along the receiving plate body to the first end of the receiving plate, allowing the gas to flow along the receiving plate body to the first end of the receiving plate. The first end of the receiving plate has an exhaust port leading to the air chamber for the gas to be discharged.

[0012] Furthermore, the air duct is a U-shaped tube.

[0013] After applying wax using this leather waxing machine, before changing the leather, first move the reflux drive mechanism to move the inlet section of the reflux assembly below the outlet section of the wax pump assembly. The reflux assembly receives the wax discharged from the outlet section and guides it back into the wax heating chamber. This prevents wax from dripping onto the leather placement table when changing leather, thus reducing the risk of contamination. The air pumping assembly pumps air from the outlet section of the reflux assembly to the inlet section. This air transfers heat from the outlet section to the inlet section, raising its temperature and reducing the likelihood of the wax solidifying upon contact with cold air as it travels from the outlet section to the inlet section. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the leather waxing machine of the first embodiment.

[0015] Figure 2 yes Figure 1 A magnified view of a portion of the image, showing a larger area. Figure 1 Part A.

[0016] Figure 3 yes Figure 1 A magnified view of a portion of the image, showing a larger area. Figure 1 Part A in the diagram shows the wax brush holder removed.

[0017] Figure 4 yes Figure 1 The BB cross-sectional view shows the receiving plate located below and behind the diverter block.

[0018] Figure 5 yes Figure 1 The BB cross-sectional view shows the receiving plate located directly below the diverter block.

[0019] Figure 6 This is a schematic diagram of the brush drive mechanism driving the wax brush to move forward.

[0020] Figure 7 This is a schematic diagram of the return drive mechanism driving the receiving plate to move forward.

[0021] Figure 8 This is a sectional view of the receiving plate and the beginning of the return pipe. The receiving plate is drawn using a fracture method.

[0022] Figure 9 This is a schematic diagram of the front right side of the leather waxing machine according to the third embodiment, in which the waxing brush bracket has been removed.

[0023] Figure 10 This is a cross-sectional view of the return pipe and the air guide pipe of the third embodiment.

[0024] Figure 11 This is a cross-sectional view of the receiving plate, the beginning of the return pipe, and the beginning of the air guide pipe in the third embodiment. The receiving plate in the figure is drawn using a fracture method. Detailed Implementation

[0025] First embodiment.

[0026] Leather waxing machine Figure 1 The system includes a conveyor belt support 11, on which a conveyor belt 12 and a drive motor 13 connected to the conveyor belt 12 are mounted. A wax brush support 21 is mounted at the front of the conveyor belt support 11, on which a wax brush 22 and a brushing drive mechanism 23 connected to the wax brush 22 are mounted. The wax brush 22 is described in detail below. Figure 4 Its front 221 and rear 223 are both provided with downward-facing bristles 220, while the middle 222 has a gap 2220. See Figure 1 and Figure 2 The leather waxing machine also includes a wax holder 41 and a wax heating box 42 mounted on the wax holder 41. The wax heating box 42 is connected to a wax pump assembly 5, and the wax outlet 52 of the wax pump assembly 5 extends to the middle 222 of the waxing brush 22. The conveyor belt 12 and the conveyor belt support 11 form a leather placement table 1. The waxing brush 22 is located at the front of the leather placement table 1, which serves as the waxing station 10. The leather waxing machine includes a controller (not shown in the figure), which controls the conveyor drive motor 13, the wax pump assembly 5, and the brush drive mechanism 23. Leather 9 with a thickness of 2mm to be waxed is placed sequentially on the conveyor belt 12. The conveyor drive motor 13, controlled by the controller, drives the conveyor belt 12 to convey the leather 9 from back to front, allowing the leather 9 to be waxed to pass through the waxing station 10 in sequence. The wax heating box 42 is prior art, its inner cavity stores solid wax, and an electric heating wire (not shown in the figure) is sandwiched between the inner and outer walls of the box. The electric heating wire is energized to heat the solid wax into wax liquid. See Figure 2 and Figure 4 The controller controls the wax pump assembly 5 to draw wax liquid from the wax heating box 42 and pump it to the middle part 222 of the waxing brush 22. The wax liquid falls from the middle part 222 of the waxing brush 22 onto the surface of the leather 9 that is currently passing through the waxing station 10. The controller controls the brush driving mechanism 23 to drive the waxing brush 22 to reciprocate to brush the surface of the leather 9, spreading the wax liquid and applying it evenly to the surface of the leather 9.

[0027] See Figure 2 and Figure 6The front of the conveyor belt support 11 is equipped with four electric push rods 14, with the rod bodies 141 extending upwards. The wax brush support 21 is installed at the upper end of the rod bodies 141 of these four electric push rods 14 and is supported by the rod bodies 141 of these four electric push rods 14. The wax brush support 21 has two sliding grooves 211 in the left and right directions. The left and right ends of the wax brush 22 are inserted into the left and right sliding grooves 211 respectively, and the left end face extends to the left with a drive shaft 229. The brushing drive mechanism 23 includes a brushing drive motor 231 and a crank-connecting rod transmission unit 232. The motor shaft 2311 of the brushing drive motor 231 drives the driven shaft 229 of the waxing brush 22 via the crank-connecting rod transmission unit 232. When the brushing drive motor 231 is working, its motor shaft 2311 drives the waxing brush 22 to reciprocate back and forth along the left and right sliding grooves 211 of the waxing brush holder 21 via the crank-connecting rod transmission unit 232. See Figure 1 and Figure 2 The wax pump assembly 5 includes a wax pump 53, which is connected to a wax inlet pipe 55 and a wax outlet pipe 56. The end of the wax inlet pipe 55 extends into the inner cavity of the wax heating box 42. See Figure 1 and Figure 4 The wax pump assembly 5 also includes an existing diverter block 54, which is installed at the middle 222 of the wax brush 22. The diverter block 54 has a liquid inlet 541 at its top and multiple diverter ports 542 arranged side-by-side at its bottom. The diverter block 54 serves as the wax outlet 52 of the wax pump assembly 5. The end 561 of the wax outlet pipe 56 extends to the middle 222 of the wax brush 22 and connects to the liquid inlet 541 at the top of the diverter block 54. Two pressure roller assemblies 24 are hinged to the front and rear ends of the corresponding sliding groove 211 at the bottom of the wax brush bracket 21. Figure 2 Due to the perspective, only the rearmost pressure roller assembly 24 is shown. (See...) Figure 2 and Figure 4 Each pressure roller assembly 24 includes two pressure rollers 241 arranged side by side. The two pressure rollers 241 are located to the left and right of the bristles 220 of the waxing brush 22, respectively, without obstructing the movement of the waxing brush 22. The hinge axes of the pressure rollers 241 are both in the left-right direction. Under normal conditions, the lower ends of the pressure roller assembly 24 and the lower ends of the bristles 220 are located 5.2 cm above the surface of the conveyor belt 12. The front and rear ends of the waxing station 10 are equipped with two leather sensors 15, one in front and one in back, respectively. The controller is connected to the two leather sensors 15. The leather sensor 15 is a conventional through-beam photoelectric sensor, including a light signal transmitter on the left and a light signal receiver on the right. Due to the perspective, only the light signal transmitter is shown in the figure. The light signal transmitter emits infrared light signals to the right, and the light signal receiver receives the infrared light signals emitted by the light signal transmitter to the left. When the leather 9 is conveyed by the conveyor belt 12 and is blocked between the light signal transmitter and the light signal receiver of a certain leather sensor 15, the leather sensor 15 will be triggered, and the leather sensor 15 will send an electrical signal to the controller.

[0028] See Figure 1 , Figure 2 and Figure 4 The controller controls four electric push rods 14, a brush drive motor 231, and a wax pump 53. The first piece of leather 9 to be waxed is conveyed forward by the conveyor belt 12, sequentially triggering the rear leather sensor 15 and the front leather sensor 15. The controller receives the electrical signal from the front leather sensor 15 and determines that the leather 9 has been conveyed to the correct position. It then controls the conveyor drive motor 13 to stop working and controls the electric push rods 14, the brush drive motor 231, the wax pump 53, and the conveyor drive motor 13 to work together to wax the first piece of leather 9 in the following manner.

[0029] See Figure 2 and Figure 4 The four electric push rods 141 are controlled to retract downwards together, thereby moving the waxing brush holder 21 downwards by 5cm. The waxing brush holder 21 then moves the waxing brush 22 downwards to press down on the main body of the front part 91 of the leather 9, and simultaneously moves the front and rear pressure roller assemblies 24 downwards to press down on the edge of the front part 91 of the leather 9. The wax pump 53 is controlled to draw wax from the wax heating box 42 through the wax inlet pipe 55 and pump the wax through the wax outlet pipe 56 to the distribution block 54 in the middle 222 of the waxing brush 22. After the wax is distributed inside the distribution block 54, it is evenly discharged from the seven distribution ports 542 at the bottom of the distribution block 54 and falls onto the surface of the front part 91 of the leather 9. See Figure 4 and Figure 6 The system controls the operation of the brushing drive motor 231. The motor shaft 2311 of the brushing drive motor 231 drives the waxing brush 22 to reciprocate back and forth on the surface of the front part 91 of the leather 9 via the crank-connecting rod transmission unit 232, thereby waxing the surface of the front part 91 of the leather 9. (See...) Figure 1 and Figure 4 The control motor 13 resumes operation, and continues to drive the conveyor belt 12 to move the leather 9 forward, sending the waxed front part 91 of the leather 9 forward away from the waxing station 10 and sending the unwaxed part of the leather 9 forward to the waxing station 10 for waxing. The leather 9 continues to be conveyed forward by the conveyor belt 12, see... Figure 5 When the rear end 92 of leather 9 moves to the front of the rear leather sensor 15, and leather 9 no longer triggers the rear leather sensor 15, the controller detects a change in the electrical signal of the rear leather sensor 15. Based on this, it determines that the rear end 92 of leather 9 has been transferred to the rear end of the waxing station 10 and the waxing operation is basically completed. Then, it controls the wax pump 53 (see...) Figure 2 (The system) has stopped working. See [link / details]. Figure 2 and Figure 5After 30 seconds, the brush drive motor 231 stops working, and the four electric push rods 14 extend upwards, causing the waxing brush holder 21, the waxing brush 22 on the waxing brush holder 21, and the pressure roller assembly 24 on the waxing brush holder 21 to move upwards and reset, so that the waxing brush 22 and the pressure roller assembly 24 no longer press down on the leather 9. See Figure 1 The conveyor drive motor 13 drives the conveyor belt 12 to continuously convey the first piece of leather 9 forward from the waxing station 10, and sends the second piece of leather 9 to the waxing station 10, thus changing the leather 9 at the waxing station 10. See also Figure 1 , Figure 2 and Figure 4 The second piece of leather 9 is conveyed forward by the conveyor belt 12, triggering the rear leather sensor 15 and the front leather sensor 15 in sequence. The controller receives the electrical signal from the front leather sensor 15 and determines that the leather 9 has been conveyed to the correct position. It then controls the conveyor drive motor 13 to stop working and controls the electric push rod 14, the brush drive motor 231, the wax pump 53 and the conveyor drive motor 13 to work together to wax the second piece of leather 9. The control method is the same as above and will not be described in detail.

[0030] See Figure 3 and Figure 7 The waxing brush 22 has two pairs of guide rail mounting blocks 224 extending downwards from its left and right edges at the middle section 222. Two guide rails 225, one for the left and one for the right, are mounted on each of the two pairs of guide rail mounting blocks 224. A receiving plate 61 is provided in the open space 2220 at the middle section 222 of the waxing brush 22. A transmission gear 71 is hinged to the left end of this open space 2220. The left and right ends of the receiving plate 61 are slidably mounted on the left and right guide rails 225, respectively. A rack 72 is fixedly mounted on the left end of the receiving plate 61, meshing with the transmission gear 71. A return drive motor 73 is provided on the top wall of the middle section 222 of the waxing brush 22. The return drive motor 73 drives the transmission gear 71 via a belt drive unit 74, allowing the transmission gear 71 to rotate and thus drive the rack 72 and the receiving plate 61 to move back and forth along the guide rails 72. Under normal conditions, the receiving plate 61 is located below and behind the diverter block 54, with a center distance of 4.5 cm from the diverter block 54, which does not affect the wax from the diverter block 54 onto the surface of the leather 9. See Figure 3 and Figure 8The receiving tray 61 has a sloping surface 611, higher on the left and lower on the right. A return pipe 62 is connected to the right end of the receiving tray 61. The return pipe 62 consists of a flexible first section 621 made of silicone (or fluororubber) and a rigid end section 622 made of stainless steel (or polytetrafluoroethylene or PTFE). The first section 621 and the end section 622 are connected together. The first end 620 of the return pipe 62 connects to the right end of the receiving tray 61, and the end is inserted into the bottom of the inner cavity of the wax heating box 42. The end section 622 of the return pipe 62 is connected to the wax heating box 42 in this manner. The receiving tray 61 and the return pipe 62 form a return assembly 6. The receiving tray 61 serves as the liquid inlet 601 of the return assembly 6, and the end section 622 of the return pipe 62 serves as the liquid outlet 602 of the return assembly 6. A return drive motor 73, a belt drive unit 74, a transmission gear 71, and a rack 72 form a return drive mechanism 7. See [link / reference needed] Figure 3 and Figure 4 When the waxing brush 22 reciprocates on the surface of the leather 9, the return drive mechanism 7 and the receiving plate 61 reciprocate synchronously with the waxing brush 22. During this process, the flexible first section 621 of the return pipe 62 swings with the receiving plate 61. The controller controls the connected return drive motor 73. After the controller determines that the waxing operation is basically completed and controls the wax pump 53 to stop working, before controlling the brush drive motor 231 to stop working, it first controls the return drive motor 73 to drive the receiving plate 61 forward by 4.5cm, so that the receiving plate 61 is as... Figure 5 As shown, the tray is moved directly below the diversion block 54 to receive residual wax discharged from the diversion block 54. The residual wax will primarily drip onto the receiving tray 61, and is unlikely to drip onto the leather placement table 1, thus minimizing contamination. Since the surface 611 of the receiving tray 61 is sloping from left to right, the wax falling onto the tray 61 will naturally flow to the right along the surface 611 to the right end of the tray 61, and then flow back into the wax heating box 42 under the guidance of the return pipe 62. After the next piece of leather 9 is conveyed into position, before controlling the wax pump 53 to restart pumping wax, the controller first controls the return drive motor 73 to drive the receiving tray 61 to move backward and reset.

[0031] See Figure 3 An air pump 81 is located beside the wax pump 53. The air pump heat sink 810 is parallel to the wax pump heat sink 530. The air pump 81 is connected to an inlet pipe 83 and an outlet pipe 84. The end 831 of the inlet pipe 83 is located above the air pump heat sink 810 and the wax pump heat sink 530, pointing downwards towards them and equipped with a gas collection hood 82. The end 841 of the outlet pipe 84 extends above the end 622 of the return pipe 62 and connects to the end 622 of the return pipe 62 from top to bottom. The air pump 81, inlet pipe 83, outlet pipe 84, and gas collection hood 82 constitute a pump assembly 8. The end 831 of the inlet pipe 83 serves as the inlet 801 of the pump assembly 8, and the end 841 of the outlet pipe 84 serves as the outlet 802 of the pump assembly 8. The controller controls the return drive motor 73 (see...). Figure 4 While driving the receiving plate 6 forward, the air pump 81 is started. The air pump 81 draws hot air from the air pump heat sink 810 and the wax pump heat sink 530 through the air inlet pipe 83, and pumps it into the end section 622 of the return pipe 62 through the air outlet pipe 84. Since the end of the return pipe 62 is inserted to the bottom of the inner cavity of the wax heating box 42, the wax in the inner cavity of the wax heating box 42 will have a liquid seal effect on the end of the return pipe 62. The hot air pumped into the end section 622 of the return pipe 62 generally cannot be discharged from the end of the return pipe 62, but will be discharged along the return pipe 62 to the receiving plate 61. The air pumping assembly 8 pumps air from the liquid outlet 602 to the liquid inlet 61 of the return assembly 6 in this way. The hot air can transfer heat from the air pump heat sink 810 and the wax pump heat sink 530 to the receiving plate 61. It can also generate airflow from the end section 622 of the return pipe 62 to the receiving plate 61, thus transferring heat from the end section 622 to the receiving plate 61. This effectively raises the temperature of the receiving plate 61, reducing the possibility of the wax solidifying upon contact with cold air when it falls from the distributor block 54 to the receiving plate 61. As the waxing operation continues, the wax in the wax heating box 42 gradually decreases due to consumption, and the liquid level gradually drops, weakening the liquid seal effect of the wax on the end of the return pipe 62. The wax heating box 42 has an observation window 425 on its wall. Operators periodically check the liquid level through the observation window 425. When the liquid level is found to be too low and insufficient to maintain an effective liquid seal, solid wax is promptly added to the wax heating box 42. After the next piece of leather 9 is delivered, the controller controls the return drive motor 73 (see...) Figure 4 While driving the receiving plate 61 to move backward and reset, the air pump 81 is stopped.

[0032] Second embodiment.

[0033] The second embodiment is largely the same as the first embodiment, except that: see Figure 3 and Figure 5 When the controller determines that the waxing operation is basically completed, it skips the step of stopping the wax pump 53 and directly controls the return drive motor 73 to move the receiving plate 61 to directly below the diverter block 54 to receive the wax discharged from the diverter block 54. The continuous operation of the wax pump 53 can keep the wax flowing continuously and prevent the wax from cooling and solidifying inside the wax pump 53. Although the wax pump 53 runs continuously during the leather 9 change process at the waxing station 10, the excess wax pumped out after being discharged from the diverter block 54 will be received by the receiving plate 61 of the return assembly 6 and guided back to the wax heating box 42 by the return pipe 62, which is less likely to drip onto the leather placement table 1 and thus less likely to contaminate the leather placement table 1.

[0034] Third embodiment.

[0035] The third embodiment is largely the same as the first embodiment, except that: the third embodiment is described in [link to third embodiment]. Figure 9 and Figure 10A U-shaped venting tube 63 is wrapped around the outside of the return pipe 62. The venting tube 63 includes a flexible first section 631 made of silicone (or fluororubber) and a rigid last section 632 made of stainless steel (or polytetrafluoroethylene or PTFE). The first section 631 and the last section 632 are connected together. The last section 622 of the return pipe 62 and the last section 632 of the venting tube 63 together form the liquid outlet 602 of the return assembly 6. The end 841 of the venting pipe 84 is changed to connect to the last section 632 of the venting tube 63 from bottom to top; see Figure 11 The receiving plate 61 has an air chamber 610 at its right end and an air inlet 613 leading to the air chamber 610. The first end 630 of the air guide pipe 63 is connected to the air inlet 613. The air chamber 610 extends along the receiving plate 61 to its left end, and the left end of the receiving plate 61 has an exhaust port 614 leading to the air chamber 610. See Figure 9 and Figure 11 The pumping assembly 8 pumps hot gas from the outlet pipe 84 into the end section 632 of the guide pipe 63. The hot gas flows along the guide pipe 63 to the beginning section 631, and from the beginning section 631 enters the air chamber 610 of the receiving plate 61. Then, it flows from right to left along the air chamber 610 of the receiving plate 61, effectively transferring heat to most of the receiving plate 61, and finally being discharged to the outside through the exhaust port 614. The hot gas flowing in the guide pipe 63 indirectly forms an airflow outside the return pipe 62, flowing from the end section 622 of the return pipe 62 to the receiving plate 61, thus indirectly transferring the heat from the end section 622 of the return pipe 62 to the receiving plate 61. Since the guide pipe 63 is only used to conduct hot gas and the return pipe 62 is only used to transport wax, their paths are independent, gas and liquid are isolated, and they do not interfere with each other.

Claims

1. A leather waxing machine, comprising a leather placement platform, and a wax heating box for heating solid wax into liquid wax, the wax heating box being connected to a wax pump assembly, a waxing brush and a brush driving mechanism connected to the waxing brush being provided on the leather placement platform, the wax outlet of the wax pump assembly extending to the waxing brush, drawing liquid wax from the wax heating box and pumping it to the waxing brush so that the liquid wax falls onto the leather surface already placed on the leather placement platform, the brush driving mechanism driving the waxing brush to reciprocate brushing the leather surface already coated with liquid wax, characterized in that: It also includes a reflux assembly and a reflux drive mechanism that drives the reflux assembly. The liquid inlet of the reflux assembly is located below the liquid outlet of the wax pump assembly. The liquid outlet of the reflux assembly is connected to the wax heating box. The reflux drive mechanism drives the liquid inlet of the reflux assembly to move below the wax outlet of the wax pump assembly, so that the reflux assembly receives the wax discharged from the wax outlet and guides it back to the wax heating box. It also includes an air pump assembly that pumps air from the liquid outlet of the reflux assembly to the liquid inlet, thereby transferring the heat from the liquid outlet of the reflux assembly to the liquid inlet.

2. The leather waxing machine according to claim 1, characterized in that: The wax pump assembly includes a wax pump and a wax outlet pipe connected to the wax pump. The end of the wax outlet pipe extends to the wax brush. The air inlet of the pump assembly is aligned with the heat dissipation part of the wax pump. After drawing the hot air from the wax pump, it is pumped from the outlet of the return assembly to the inlet.

3. The leather waxing machine according to claim 2, characterized in that: The air pump assembly includes an air pump, which is connected to an air inlet pipe and an air outlet pipe. The air outlet pipe is connected to the liquid outlet section of the return assembly. The air pump heat dissipation section is parallel to the wax pump heat dissipation section. The end of the air inlet pipe serves as the liquid inlet section of the air pump assembly. The air pump is aligned with the wax pump heat dissipation section and the air pump heat dissipation section. The hot air from the wax pump and the air pump is drawn and pumped from the liquid outlet section of the return assembly to the liquid inlet section.

4. The leather waxing machine according to claim 1 or 2, characterized in that: The reflux assembly's liquid inlet section is equipped with a receiving tray to receive the wax discharged from the wax outlet section. A reflux pipe is connected to the receiving tray, with the end of the reflux pipe located at the liquid outlet section of the reflux assembly and connected to the wax heating box. This pipe guides the wax back into the wax heating box. The air outlet pipe of the air pump assembly is connected from top to bottom to the end of the reflux pipe. Air is pumped from the end of the reflux pipe to the receiving tray, thereby transferring the heat from the end of the reflux pipe to the receiving tray.

5. The leather waxing machine according to claim 1 or 2, characterized in that: The reflux assembly's liquid inlet section is equipped with a receiving tray to receive the wax liquid discharged from the wax outlet section. A reflux pipe is connected to the receiving tray, and the end of the reflux pipe is connected to the wax heating box to guide the wax liquid back into the wax heating box. A venting pipe is wrapped around the outside of the reflux pipe. The end of the reflux pipe and the end of the venting pipe together form the liquid outlet section of the reflux assembly. The end of the venting pipe is connected to a pumping assembly, which pumps air from the end of the venting pipe to the beginning of the venting pipe, thereby indirectly transferring the heat from the end of the reflux pipe to the receiving tray via the venting pipe.

6. The leather waxing machine according to claim 5, characterized in that: The receiving plate has an inclined surface that is higher at the beginning and lower at the end, and the first section of the return pipe is connected to the end of the receiving plate.

7. The leather waxing machine according to claim 6, characterized in that: The receiving plate has an air chamber at its end and an air inlet leading to the air chamber. The first section of the pump pipe is connected to the air inlet at the end of the receiving plate, and the gas pumped out by the pumping assembly is introduced into the air chamber. The air chamber extends along the receiving plate body to the first end of the receiving plate, allowing the gas to flow along the receiving plate body to the first end of the receiving plate. The first end of the receiving plate has an exhaust port leading to the air chamber for the gas to be discharged.

8. The leather waxing machine according to claim 5, characterized in that: The air delivery tube is a U-shaped tube.

Images