An oiling device for leather processing

By using a uniform oiling mechanism and an oil collection mechanism, the problem of uneven oil application in existing oiling devices is solved, achieving consistent oil distribution and effective utilization of the oil in the sponge roller brush, thus ensuring uniform oiling during leather processing.

CN224548447UActive Publication Date: 2026-07-24ANHUI YIGE MATERIALS TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
ANHUI YIGE MATERIALS TECHNOLOGY CO LTD
Filing Date
2025-07-11
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

The existing oiling device has uneven oil coating, resulting in local over- or under-oiling. In addition, the sponge shaft accumulates oil during the circulating coating process, causing waste and pollution.

Method used

The uniform oiling mechanism actively presses oil into the installation pipe through a push rod and piston rod mechanism. After a stable oil pressure is formed, the lubricating oil is evenly distributed to the oil outlet pipe. The top plug and retaining ring in the oil outlet pipe form an intelligent valve to ensure equal oil output and uniform oil saturation of the sponge strip. The oil collection mechanism collects excess oil through a scraper to avoid waste.

Benefits of technology

It achieves a consistent oil distribution across the entire sponge roller brush, avoiding oil waste and contamination, and ensuring a uniform oiling effect during leather processing.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to leather processing technical field, concretely is a kind of oiling device for leather processing, including mounting bracket, and swivel mounting is installed on the mounting bracket, swivel is fixedly installed with sponge roller brush on, and sponge roller brush is embedded with multiple groups of equidistance distribution's sponge strip, tooth ring is sleeved on the swivel, driving wheel is rotatably installed on the mounting bracket, driving wheel is engaged connection with tooth ring, even oiling mechanism is fixedly installed in the mounting bracket, and oil-collecting mechanism for collecting excess oil liquid is equipped on the mounting bracket. The top plug, the blocking ring and the second spring assembly arranged in the oil outlet pipe constitute an intelligent valve: when the oil pressure reaches the threshold value, the top plug is synchronously pushed open, to ensure that multiple oil outlet pipes are equal and synchronous, and the oil is directly introduced into the roots of multiple independent sponge strips embedded in the sponge roller brush through the slide plate oil groove. The structure of the sliding connection between the sponge strip and the oil groove makes the oil evenly infiltrate each sponge strip from inside to outside and from bottom to top, completely solving the uneven oil absorption problem of traditional sponge shaft.
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Description

Technical Field

[0001] This utility model relates to the field of leather processing technology, specifically to an oiling device for leather processing. Background Technology

[0002] Leather is animal hide that has undergone physical and chemical processing such as hair removal and tanning, resulting in a material that is no longer prone to decay. Leather is composed of natural protein fibers tightly woven in three-dimensional space, and its surface has a special grain layer with natural grain and luster, making it comfortable to the touch. During the production and use of leather, it gradually loses its internal oils, causing the leather to harden and crack. Applying oil can replenish these lost oils and maintain the leather's softness and elasticity.

[0003] Existing oiling devices mostly use gravity-feeding or simple pumping systems to apply oil to the sponge shaft. The oil is unevenly distributed inside the sponge shaft, which eventually leads to local over- or under-oiling during application. In addition, a large amount of oil accumulates on the sponge shaft during the circulating application process and eventually drips off and is discarded, which not only wastes oil to a certain extent but may also contaminate the leather. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides an oiling device for leather processing, which solves the problems mentioned in the background art.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution: an oiling device for leather processing, comprising a mounting frame and a rotating frame rotatably mounted on the mounting frame, wherein a sponge roller brush is fixedly mounted on the rotating frame, the sponge roller brush is embedded with multiple sets of equidistantly distributed sponge strips, a toothed ring is sleeved on the rotating frame, a drive wheel is rotatably mounted on the mounting frame, the drive wheel is meshed with the toothed ring, a uniform oiling mechanism is fixedly mounted inside the mounting frame, and an oil collection mechanism for collecting excess oil is provided on the mounting frame;

[0008] The uniform oiling mechanism includes an installation tube fixedly mounted on a mounting frame. The installation tube is located inside the sponge roller brush. An oil injection pipe is fixedly mounted on the installation tube. Multiple sets of equidistantly distributed oil outlet pipes are fixedly mounted on the installation tube. A sliding plate is fixedly mounted on the multiple sets of oil outlet pipes. Oil grooves are opened on the sliding plate and the multiple sets of oil outlet pipes. Multiple sets of sponge strips are slidably connected to the sliding plate and the oil outlet pipes through the oil grooves. A fixing frame is fixedly mounted inside each set of oil outlet pipes. A top plug is slidably sleeved on the fixing frame. Two sets of symmetrically distributed second springs are sleeved on the fixing frame. The two ends of the two sets of second springs are fixedly connected to the top plug and the fixing frame, respectively. A retaining ring is fixedly mounted inside the oil outlet pipe. The top plug and the retaining ring are movably engaged.

[0009] Preferably, an oil storage tank is fixedly installed on the oil injection pipe, an installation rod is fixedly installed on the oil injection pipe, a push rod is slidably installed inside the installation rod, and a piston rod is slidably installed inside the push rod. A clamp is fixedly installed inside the oil injection pipe, a plug is slidably sleeved on the clamp, and two sets of symmetrically distributed first springs are sleeved on the clamp. The two ends of the two sets of first springs are fixedly connected to the plug and the clamp respectively. A retaining ring is fixedly installed inside the oil injection pipe, and the plug and the retaining ring are movably engaged. The oil storage tank is located between the piston rod and the plug.

[0010] Preferably, a screw is rotatably installed inside the mounting rod, and a screw tube is rotatably installed inside the push rod. The screw passes through the push rod and is threadedly connected to the push rod, and the screw tube passes through the piston rod and is threadedly connected to the piston rod.

[0011] Preferably, the screw has two sets of symmetrically distributed keyways, and the spiral tube has two sets of symmetrically distributed key blocks, with the key blocks corresponding to the keyways. The spiral tube is slidably connected to the screw through the key blocks.

[0012] Preferably, the oil collection mechanism includes an oil collection tank fixedly installed on a mounting frame, a scraper fixedly installed on the oil collection tank, the scraper being fitted to the surface of a sponge roller brush, a connecting pipe fixedly installed below the oil collection tank, a filter frame provided above the connecting pipe, and the filter frame being movably engaged with the oil collection tank.

[0013] Preferably, two sets of symmetrically distributed slides are slidably installed inside the oil collection tank. Each set of slides is fixedly installed with a rod. Both sets of rods are movably engaged with the filter frame. A third spring is sleeved on each set of rods. The two ends of the third spring are fixedly connected to the rod and the oil collection tank, respectively. A rack is fixedly installed on each set of slides, and a gear is provided between the two sets of racks.

[0014] Preferably, the gear is meshed with two sets of racks respectively, the gear is rotatably connected to the oil collection tank via a handle, and a torsion spring is sleeved on the handle, with both ends of the torsion spring being fixedly connected to the gear and the oil collection tank respectively.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, the present invention provides an oiling device for leather processing, which has the following beneficial effects:

[0017] The oil in the storage tank is actively forced into the installation pipe through a push rod and piston rod mechanism. Once the installation pipe is full and a stable oil pressure is formed, the lubricating oil is evenly distributed to all the outlet pipes. The top plug, retaining ring, and second spring assembly inside the outlet pipe constitute an intelligent valve: when the oil pressure reaches the threshold, the top plug is opened synchronously, ensuring that multiple outlet pipes output oil in equal and synchronous quantities. The oil is directly introduced into the roots of multiple independent sponge strips embedded inside the sponge roller brush through the sliding oil groove. The structure of the sponge strips slidingly connected to the oil groove allows the oil to evenly wet each sponge strip from the inside out and from the bottom up, completely solving the problem of uneven oil absorption in traditional sponge shafts. This ensures the consistency of the overall oil distribution of the sponge roller brush from the source. During the rotation of the sponge roller brush after absorbing oil, the scraper scrapes and collects the excess oil in the oil collection tank, effectively avoiding oil waste. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of a partially disassembled structure of the present invention;

[0021] Figure 3 This is a schematic diagram of the uniform oiling mechanism of this utility model;

[0022] Figure 4 This utility model Figure 3 Enlarged schematic diagram of the structure at point A in the diagram;

[0023] Figure 5 This utility model Figure 3 Enlarged schematic diagram of the structure at point B in the diagram;

[0024] Figure 6 This is a schematic diagram of the oil collection mechanism of this utility model;

[0025] Figure 7 This utility model Figure 6 A magnified schematic diagram of the structure at point C.

[0026] In the diagram: 1. Mounting bracket; 2. Rotating bracket; 3. Sponge roller brush; 4. Sponge strip; 5. Gear ring; 6. Drive wheel; 7. Uniform oiling mechanism; 701. Oil injection pipe; 702. Oil reservoir; 703. Mounting rod; 704. Push rod; 705. Piston rod; 706. Screw; 707. Keyway; 708. Screw tube; 709. Key block; 710. Frame; 711. Plug; 712. First spring; 713. Snap ring; 714. 715. Installation pipe; 716. Oil outlet pipe; 717. Slide plate; 718. Oil tank; 719. Fixing bracket; 720. Top plug; 721. Second spring; 722. Retaining ring; 802. Oil collection mechanism; 803. Oil collection tank; 804. Scraper; 805. Connecting pipe; 806. Filter frame; 807. Slide frame; 808. Insert rod; 809. Third spring; 8000. Rack; 8001. Gear; 810. Handle; 811. Torsion spring. Detailed Implementation

[0027] The following will describe in detail the implementation of this application with reference to the accompanying drawings and embodiments, so that the implementation process of how this application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0028] Figures 1-7In one embodiment of this utility model, an oiling device for leather processing includes a mounting frame 1 and a rotating frame 2 rotatably mounted on the mounting frame 1. A sponge roller brush 3 is fixedly mounted on the rotating frame 2, and multiple sets of equidistantly distributed sponge strips 4 are embedded inside the sponge roller brush 3. A toothed ring 5 is sleeved on the rotating frame 2. A drive wheel 6 is rotatably mounted on the mounting frame 1, and the drive wheel 6 meshes with the toothed ring 5. A uniform oiling mechanism 7 is fixedly mounted inside the mounting frame 1, and an oil collecting mechanism 8 for collecting excess oil is provided on the mounting frame 1. The uniform oiling mechanism 7 includes a mounting pipe 714 fixedly mounted on the mounting frame 1, located inside the sponge roller brush 3. An oil injection pipe 701 is fixedly mounted on the mounting pipe 714, and multiple sets of equidistantly distributed oil outlet pipes 715 are fixedly mounted on the mounting pipe 714. The device is equipped with a slide plate 716, and oil grooves 717 are opened on the slide plate 716 and multiple sets of oil outlet pipes 715. Multiple sets of sponge strips 4 are slidably connected to the slide plate 716 and oil outlet pipes 715 through the oil grooves 717. A fixing bracket 718 is fixedly installed in each of the multiple sets of oil outlet pipes 715, and a top plug 719 is slidably sleeved on the fixing bracket 718. Two sets of symmetrically distributed second springs 720 are sleeved on the fixing bracket 718, and the two ends of the two sets of second springs 720 are fixedly connected to the top plug 719 and the fixing bracket 718 respectively. A retaining ring 721 is fixedly installed in the oil outlet pipe 715, and the top plug 719 is movably engaged with the retaining ring 721. The oil in the oil storage tank 702 is actively pressed into the installation pipe 714 through the push rod 704 and piston rod 705 mechanism. After the installation pipe 714 is filled and a stable oil pressure is formed, the lubricating oil is evenly distributed to all oil outlet pipes 715. The top plug 719, retaining ring 721, and second spring 720 assembly inside the oil outlet pipe 715 constitute an intelligent valve: when the oil pressure reaches the threshold, the top plug 719 is synchronously opened, ensuring that multiple sets of oil outlet pipes 715 output oil in equal and synchronous quantities. The oil is directly introduced into the roots of multiple independent sponge strips 4 embedded inside the sponge roller brush 3 through the slide plate 716 and oil groove 717. The structure of the sponge strips 4 slidingly connected to the oil groove 717 allows the oil to evenly wet each sponge strip 4 from the inside out and from bottom to top, completely solving the problem of uneven oil absorption in traditional sponge rollers.

[0029] In this embodiment, reference Figure 3 , Figure 4 , Figure 5As shown, an oil reservoir 702 is fixedly installed on the oil injection pipe 701. An installation rod 703 is fixedly installed on the oil injection pipe 701. A push rod 704 is slidably installed inside the installation rod 703, and a piston rod 705 is slidably installed inside the push rod 704. A clamp 710 is fixedly installed inside the oil injection pipe 701. A plug 711 is slidably sleeved on the clamp 710. Two sets of symmetrically distributed first springs 712 are sleeved on the clamp 710. The two ends of the two sets of first springs 712 are fixedly connected to the plug 711 and the clamp 710, respectively. A retaining ring 713 is fixedly installed inside the oil injection pipe 701. The plug 711 and... The retaining ring 713 is movable and engages. The oil reservoir 702 is located between the piston rod 705 and the retainer 711. A screw 706 is rotatably installed inside the mounting rod 703, and a threaded tube 708 is rotatably installed inside the push rod 704. The screw 706 passes through the push rod 704 and is threadedly connected to the push rod 704. The threaded tube 708 passes through the piston rod 705 and is threadedly connected to the piston rod 705. Two sets of symmetrically distributed keyways 707 are provided on the screw 706, and two sets of symmetrically distributed key blocks 709 are provided inside the threaded tube 708. The key blocks 709 are correspondingly arranged with the keyways 707. The threaded tube 708 is connected to the screw through the key blocks 709. The 706 sliding sleeve, driven by the motor, causes the push rod 704 to slide within the mounting rod 703. The threaded tube 708, which engages with the screw 706 via the keyway 707 and key block 709, rotates synchronously with the screw 706 as the push rod 704 slides. This causes the piston rod 705 to slide within the push rod 704. The piston rod 705 compresses the lubricating oil entering the oil injection pipe 701 from the oil reservoir 702, overcoming the resistance of the first spring 712 between the plug 711 and the retaining ring 713 via a one-way valve structure, thus forcing the oil into the oil injection pipe 701. The oil is continuously injected. The central oil chamber, i.e., the installation pipe 714, is filled until it forms a stable pressure chamber. At this time, the oil pressure is evenly applied to the inlet of all oil outlet pipes 715. When the oil pressure in the installation pipe 714 reaches the threshold, it pushes the top plug 719 in each oil outlet pipe 715 to overcome the elastic force of the second spring 720 and disengage from the retaining ring 721. The oil flows into multiple sets of oil outlet pipes 715 simultaneously. The oil enters the oil groove 717 of the slide plate 716 through the oil outlet pipe 715 and comes into direct contact with the sponge strip 4 that is slidably embedded in the oil groove 717. The oil evenly wets each sponge strip 4 from the inside out through capillary action, ensuring the overall oil absorption consistency of the sponge roller brush 3.

[0030] In this embodiment, reference Figure 6 and Figure 7As shown, the oil collecting mechanism 8 includes an oil collecting tank 801 fixedly installed on the mounting frame 1. A scraper 802 is fixedly installed on the oil collecting tank 801, and the scraper 802 is fitted to the surface of the sponge roller brush 3. A connecting pipe 803 is fixedly installed below the oil collecting tank 801, and a filter frame 804 is provided above the connecting pipe 803. The filter frame 804 is movably engaged with the oil collecting tank 801. Two sets of symmetrically distributed slides 805 are slidably installed inside the oil collecting tank 801. Both sets of slides 805 are fixedly equipped with insert rods 806, which are movably engaged with the filter frame 804. A third spring 807 is sleeved on each insert rod 806, with both ends of the third spring 807 fixedly connected to the insert rod 806 and the oil collection tank 801, respectively. Both sets of slides 805 are fixedly equipped with racks 808, and a gear 809 is provided between the two sets of racks 808. The gear 809 meshes with both sets of racks 808. Wheel 809 is rotatably connected to oil collection tank 801 via handle 810. A torsion spring 811 is sleeved on handle 810. The two ends of torsion spring 811 are fixedly connected to gear 809 and oil collection tank 801 respectively. When the rotating sponge roller brush 3 passes the fixed scraper 802, excess oil and impurities on the surface are scraped into oil collection tank 801. The oil is recycled through connecting pipe 803. Impurities adhering to the sponge roller brush 3 during the oiling process enter oil collection tank 801 along with the oil. After being filtered by filter frame 804, impurities are prevented from clogging connecting pipe 803. After a period of use, filter frame 804 can be rotated by rotating handle 810 on oil collection tank 801, which drives gear 809 to rotate. In conjunction with two sets of racks 808, it drives two sets of slides 805 and insert rod 806 to slide synchronously to both sides, releasing the insert rod 806 from the filter frame 804. Filter frame 804 can be disassembled for cleaning and replacement.

[0031] In this embodiment, during operation, the screw 706 in the mounting rod 703, driven by the motor, causes the push rod 704 to slide within the mounting rod 703. The threaded tube 708, which engages with the screw 706 via the keyway 707 and key block 709, rotates synchronously with the screw 706 as the push rod 704 slides. This causes the piston rod 705 to slide within the push rod 704, squeezing the lubricating oil from the oil reservoir 702 into the oil injection pipe 701, overcoming the blockage 711. The first spring 712, located between the retaining ring 713 and the first check valve structure, forces oil into the injection pipe 701. The oil continuously injects into the central oil chamber, i.e., the installation pipe 714, until it is full, forming a stable pressure chamber. At this time, the oil pressure acts evenly on the inlets of all the outlet pipes 715. When the oil pressure in the installation pipe 714 reaches a threshold, it pushes the top plug 719 in each outlet pipe 715, overcoming the elastic force of the second spring 720 and disengaging from the retaining ring 721. The oil then flows synchronously into multiple sets of outlet pipes 715. The liquid enters the oil tank 717 of the slide plate 716 through the oil outlet pipe 715, and comes into direct contact with the sponge strips 4 that are slidably embedded in the oil tank 717. The oil evenly wets each sponge strip 4 from the inside out through capillary action, ensuring the overall oil absorption consistency of the sponge roller brush 3. When the rotating sponge roller brush 3 passes the fixed scraper 802, excess oil and impurities on the surface are scraped into the oil collection tank 801. The oil is recycled through the connecting pipe 803. Impurities that adhere to the sponge roller brush 3 during the oiling process enter the oil collection tank 801 along with the oil. After being filtered by the filter frame 804, impurities are prevented from clogging the connecting pipe 803. After a period of use, the filter frame 804 can be rotated by rotating the handle 810 on the oil collection tank 801, which drives the gear 809 to rotate. In conjunction with the two sets of racks 808, the two sets of slides 805 and the insert rod 806 slide synchronously to both sides, releasing the insert rod 806 from the filter frame 804. The filter frame 804 can then be disassembled for cleaning and replacement.

[0032] The control method of this utility model is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the field. Since this utility model is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail.

[0033] It should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An oiling device for leather processing, comprising a mounting frame (1) and a rotating frame (2) rotatably mounted on the mounting frame (1), characterized in that: A sponge roller brush (3) is fixedly installed on the rotating frame (2). The sponge roller brush (3) has multiple sets of equally spaced sponge strips (4) embedded in it. A toothed ring (5) is sleeved on the rotating frame (2). A drive wheel (6) is rotatably installed on the mounting frame (1). The drive wheel (6) meshes with the toothed ring (5). A uniform oiling mechanism (7) is fixedly installed inside the mounting frame (1). An oil collecting mechanism (8) for collecting excess oil is provided on the mounting frame (1). The uniform oiling mechanism (7) includes an installation pipe (714) fixedly installed on the mounting frame (1). The installation pipe (714) is located inside the sponge roller brush (3). An oil injection pipe (701) is fixedly installed on the installation pipe (714). Multiple sets of equally spaced oil outlet pipes (715) are fixedly installed on the installation pipe (714). A sliding plate (716) is fixedly installed on the multiple sets of oil outlet pipes (715). Oil grooves (717) are opened on the sliding plate (716) and the multiple sets of oil outlet pipes (715). Multiple sets of sponge strips (4) all pass through the oil grooves (717). The slide plate (716) and the oil outlet pipe (715) are slidably connected. Each of the multiple sets of oil outlet pipes (715) is fixedly installed with a fixing bracket (718). A top plug (719) is slidably sleeved on the fixing bracket (718). Two sets of symmetrically distributed second springs (720) are sleeved on the fixing bracket (718). The two ends of the two sets of second springs (720) are fixedly connected to the top plug (719) and the fixing bracket (718) respectively. A retaining ring (721) is fixedly installed inside the oil outlet pipe (715). The top plug (719) and the retaining ring (721) are movably engaged.

2. The oiling device for leather processing according to claim 1, characterized in that: An oil storage tank (702) is fixedly installed on the oil injection pipe (701). An installation rod (703) is fixedly installed on the oil injection pipe (701). A push rod (704) is slidably installed inside the installation rod (703), and a piston rod (705) is slidably installed inside the push rod (704). A clamp (710) is fixedly installed inside the oil injection pipe (701). A plug (711) is slidably sleeved on the clamp (710). Two sets of symmetrically distributed first springs (712) are sleeved on the clamp (710). The two ends of the two sets of first springs (712) are fixedly connected to the plug (711) and the clamp (710) respectively. A retaining ring (713) is fixedly installed inside the oil injection pipe (701). The plug (711) and the retaining ring (713) are movably engaged. The oil storage tank (702) is located between the piston rod (705) and the plug (711).

3. The oiling device for leather processing according to claim 2, characterized in that: A screw (706) is rotatably installed inside the mounting rod (703), and a screw tube (708) is rotatably installed inside the push rod (704). The screw (706) passes through the push rod (704) and is threadedly connected to the push rod (704). The screw tube (708) passes through the piston rod (705) and is threadedly connected to the piston rod (705).

4. The oiling device for leather processing according to claim 3, characterized in that: The screw (706) has two sets of symmetrically distributed keyways (707), and the screw tube (708) has two sets of symmetrically distributed key blocks (709), with the key blocks (709) corresponding to the keyways (707). The screw tube (708) is slidably connected to the screw (706) through the key blocks (709).

5. The oiling device for leather processing according to claim 1, characterized in that: The oil collection mechanism (8) includes an oil collection tank (801) fixedly installed on the mounting frame (1), a scraper (802) fixedly installed on the oil collection tank (801), the scraper (802) is attached to the surface of the sponge roller brush (3), a connecting pipe (803) is fixedly installed below the oil collection tank (801), a filter frame (804) is provided above the connecting pipe (803), and the filter frame (804) is movably engaged with the oil collection tank (801).

6. The oiling device for leather processing according to claim 5, characterized in that: Two sets of symmetrically distributed slides (805) are slidably installed inside the oil collection tank (801). A rod (806) is fixedly installed on each of the two sets of slides (805). The two sets of rods (806) are movably engaged with the filter frame (804). A third spring (807) is sleeved on each of the two sets of rods (806). The two ends of the third spring (807) are fixedly connected to the rod (806) and the oil collection tank (801) respectively. A rack (808) is fixedly installed on each of the two sets of slides (805). A gear (809) is provided between the two sets of racks (808).

7. The oiling device for leather processing according to claim 6, characterized in that: The gear (809) is meshed with two sets of racks (808) respectively. The gear (809) is rotatably connected to the oil collection tank (801) through the handle (810). A torsion spring (811) is sleeved on the handle (810). The two ends of the torsion spring (811) are fixedly connected to the gear (809) and the oil collection tank (801) respectively.