Workpiece pretreatment equipment for powder spraying coating assembly line

Abstract

The invention relates to the technical field of surface treatment, in particular to powder spraying coating assembly line workpiece pretreatment equipment which comprises a liquid storage empty box and a cross-shaped supporting frame rotationally connected to the liquid storage empty box, a supporting circular ring is fixedly connected to the cross-shaped supporting frame, and the outer end face of the supporting circular ring is evenly and fixedly connected with a plurality of sleeving and fixing rotating shafts; a plurality of sleeving and fixing rotating shafts are divided into two rows, the positions of the two rows of sleeving and fixing rotating shafts are in one-to-one correspondence, the corresponding sleeving and fixing rotating shafts are located on the same straight line, a limiting notch ring is fixedly connected to the liquid storage empty box, two contact ring plates are slidably connected to the limiting notch ring, and a two-way lead screw is rotationally connected to the limiting notch ring. The two ends of the two-way lead screw are in transmission connection with the two contact ring plates through threads respectively, the two-way lead screw is rotationally connected with the liquid storage empty box and is sealed, and the outer ends of the two contact ring plates are fixedly connected with bearing rotating seats. Uniform phosphating pretreatment on the multiple workpieces is achieved, and the phosphating pretreatment efficiency of the multiple workpieces is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of surface treatment, in particular to workpiece pretreatment equipment for a powder spraying and coating production line. Background Art

[0002] Powder spraying utilizes the corona discharge phenomenon to cause powder coating to adhere to the workpiece. The process is as follows: the powder spray gun is connected to the negative electrode, the workpiece is grounded, and the powder coating is fed into the spray gun by the powder supply system using compressed air. A high-voltage electrostatic generator is applied to the front end of the spray gun to generate high voltage. Due to corona discharge, a dense charge is generated in the vicinity. When the powder is sprayed from the nozzle, a circuit is formed to form charged coating particles. These particles are attracted to the workpiece with opposite polarity due to the electrostatic force. As more powder is sprayed, the charge accumulates. When a certain thickness is reached, electrostatic repulsion occurs and the particles stop adsorbing the powder, resulting in a certain thickness of powder coating on the entire workpiece. The powder is then melted, leveled, and solidified by heat, forming a hard coating film on the workpiece surface.

[0003] Powder coating of workpieces requires pretreatment of the workpieces, that is, phosphating treatment. Phosphating treatment can enhance the adhesion of the workpiece surface and form a corrosion-resistant phosphating film. However, the existing technology simply immerses the workpieces in a box to complete the phosphating treatment of the workpieces. Because multiple workpieces are piled together, the workpieces cannot be uniformly phosphated. Therefore, it is particularly important to design a device that can uniformly phosphate the workpieces. Summary of the Invention

[0004] A technical problem to be solved by the present application is to achieve uniform phosphating pretreatment of multiple workpieces and further improve the efficiency of phosphating pretreatment of multiple workpieces.

[0005] In order to solve the above technical problems, an embodiment of the present application provides a workpiece pretreatment equipment for a powder coating assembly line, including a liquid storage tank and a cross support frame rotatably connected to the liquid storage tank, a supporting ring fixedly connected to the cross support frame, and a plurality of sleeve fixed rotating shafts are evenly fixedly connected to the outer end surface of the supporting ring. The plurality of sleeve fixed rotating shafts are divided into two rows, and the positions of the two rows of sleeve fixed rotating shafts correspond one to one. The corresponding sleeve fixed rotating shafts are on the same straight line, and a limiting notch ring is fixedly connected to the liquid storage tank.

[0006] In some embodiments, the limiting gap ring is slidingly connected to two contact ring plates, the limiting gap ring is rotatably connected to a bidirectional screw, the two ends of the bidirectional screw are respectively connected to the two contact ring plates through threaded transmission, and the bidirectional screw is rotatably connected to the liquid storage tank and sealed.

[0007] In some embodiments, the outer ends of the two contact ring plates are fixedly connected to bearing swivels, and discharge rollers are rotatably connected to the two bearing swivels. The inner tangent surfaces of the two discharge rollers and the inner end surfaces of the two contact ring plates are in the same plane, and the two bearing swivels are fixedly connected to reduction motors I, and the output shafts of the two reduction motors I are respectively fixedly connected to the two discharge rollers.

[0008] In some embodiments, the liquid storage empty box is rotatably connected to two supporting shafts, and a groove conveyor belt is transmission-connected between the two supporting shafts.

[0009] In some embodiments, a double-groove slide cavity is fixedly connected to the liquid storage empty box, the double-groove slide cavity is located directly above the supporting ring, and a transverse support plate is slidably connected to the double-groove slide cavity.

[0010] In some embodiments, two limiting horizontal sliding columns are slidably connected to the double-groove sliding cavity, and the outer ends of the two limiting horizontal sliding columns are fixedly connected to a semicircular horizontal column. Springs I are both sleeved on the two limiting horizontal sliding columns, and the inner ends of the two springs I are in contact with the double-groove sliding cavity, and the outer ends of the two springs I are in contact with the semicircular horizontal column.

[0011] In some embodiments, a hinged bracket is fixedly connected to the double-groove slide cavity, a linkage rocker is rotatably connected to the hinged bracket, the two ends of the linkage rocker are respectively in contact with the transverse support plate and the semicircular horizontal column, and a linkage cam is rotatably connected to the liquid storage empty box, and the linkage cam is in contact with the transverse support plate.

[0012] In some embodiments, the liquid storage tank is fixedly connected to a reduction motor II, the output shaft of the reduction motor II is fixedly connected to a transmission pulley I, the rear ends of the two supporting shafts are fixedly connected to a transmission pulley II, the rear end of the linkage cam is fixedly connected to a transmission pulley III, and the transmission pulley I, the two transmission pulleys II and the transmission pulley III are connected through a transmission belt.

[0013] In some embodiments, a semicircular gear is fixedly connected to the output shaft of the reduction motor II, a linkage gear is fixedly connected to the rear end of the cross support frame, and the semicircular gear is meshed with the linkage gear for transmission connection.

[0014] In some embodiments, two supporting slides are fixedly connected to the front and rear ends of the liquid storage tank, and a stopping ring is slidably connected to the two supporting slides. The two stopping rings are respectively in contact with the front and rear ends of the cross support frame, and the two stopping rings are respectively provided with a spring II, and the outer ends of the two springs II are respectively in contact with the two supporting slides.

[0015] The present invention has at least the following beneficial effects:

[0016] 1. Put two circular workpieces with circular holes on the two uppermost sleeve fixed shafts respectively, then use the cross support frame to drive the supporting ring to rotate intermittently, and use the intermittent rotation of the supporting ring to drive multiple sleeve fixed shafts to rotate intermittently. When the supporting ring stops, the next group of two sleeve fixed shafts will move to the top. At this time, put two new circular workpieces with circular holes on the two upper sleeve fixed shafts, and cycle in sequence to achieve multiple circular workpieces with circular holes on multiple sleeve fixed shafts. When multiple circular workpieces with circular holes are moved into the empty liquid storage tank, they can come into contact with the phosphating liquid. At this time, the phosphating liquid will be evenly attached to the workpiece. When the workpiece moves to the far right, it will be discharged, and the phosphating pretreatment of multiple workpieces will be achieved in sequence.

[0017] 2. The two contact ring plates can contact multiple circular workpieces with circular holes. At this time, when the multiple circular workpieces with circular holes rotate, they will contact the two contact ring plates. The multiple circular workpieces with circular holes will rotate, which can ensure that the multiple circular workpieces with circular holes can be evenly contacted with the phosphating liquid, so that the phosphating liquid can be evenly attached to the workpieces. The threads at both ends of the bidirectional screw rotate in opposite directions. After rotating the bidirectional screw, the two contact ring plates can be driven to slide inward or outward at the same time, thereby changing the distance between the two contact ring plates, which can ensure that the two contact ring plates can contact circular workpieces with circular holes of different diameters, allowing workpieces with different diameters to rotate during the phosphating process, realizing phosphating treatment of workpieces with different diameters, and improving phosphating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0019] Figure 1 It is a schematic diagram of the overall structure of workpiece pretreatment equipment used in powder coating production lines;

[0020] Figure 2 It is the other side of the overall structural diagram of a workpiece pretreatment equipment for a powder coating production line;

[0021] Figure 3 This is a schematic diagram of the structure of the workpiece pretreatment equipment part used in the powder coating production line Figure 1 ;

[0022] Figure 4 This is a schematic diagram of the structure of the workpiece pretreatment equipment part used in the powder coating production line Figure 2 ;

[0023] Figure 5 Schematic diagram of the structure of an embodiment of phosphating a workpiece;

[0024] Figure 6 This is a structural diagram of an embodiment of providing a placement space for a hollow cylindrical workpiece;

[0025] Figure 7 This is a schematic diagram of a specific structure of an embodiment of providing a placement space for a hollow cylindrical workpiece;

[0026] Figure 8 It is a structural diagram of an embodiment of driving the workpiece to be discharged after phosphating;

[0027] Figure 9 This is a structural diagram of an embodiment for achieving uniform drop of multiple workpieces;

[0028] Figure 10 It is another structural schematic diagram of an embodiment for achieving uniform falling of multiple workpieces.

[0029] In the figure: liquid storage empty tank 101, cross support frame 102, supporting ring 103, sleeve fixed shaft 104, limiting notch ring 105, contact ring plate 201, bidirectional screw 202, bearing swivel seat 301, discharge roller 302, reduction motor I303, support shaft 401, groove conveyor belt 402, double-groove slide cavity 501, transverse support plate 502, limiting transverse sliding column 601, semicircular transverse column 602, spring I603, articulated bracket 701, linkage rocker plate 702, linkage cam 703, reduction motor II801, transmission pulley I802, transmission pulley II803, transmission pulley III804, semicircular gear 901, linkage gear 902, support slide plate 903, stop ring 904, spring II905. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] Example 1: Please refer to Figure 1-8 The present invention provides a technical solution: a workpiece pretreatment device for a powder coating assembly line, comprising a liquid storage tank 101 and a cross support frame 102 rotatably connected to the liquid storage tank 101, a supporting ring 103 fixedly connected to the cross support frame 102, a plurality of sleeve fixed rotating shafts 104 evenly fixedly connected to the outer end surface of the supporting ring 103, the plurality of sleeve fixed rotating shafts 104 are divided into two rows, the positions of the two rows of sleeve fixed rotating shafts 104 correspond one to one, the corresponding sleeve fixed rotating shafts 104 are on the same straight line, and a limiting notch ring 105 is fixedly connected to the liquid storage tank 101.

[0032] Furthermore, the liquid storage tank 101 can provide storage space for the phosphating liquid, and the phosphating treatment of multiple workpieces can be completed in the liquid storage tank 101. A lifting support plate is slidably connected to the liquid storage tank 101, and the lifting of the support plate can drive the phosphating liquid to move up and down. Because the phosphating liquid in the liquid storage tank 101 will become less during use, which may cause the workpiece to be unable to contact the phosphating liquid in the liquid storage tank 101, the lifting of the support plate is used to drive the phosphating liquid to move upward, ensuring that the phosphating liquid in the liquid storage tank 101 can be evenly attached to the surface of the workpiece, and the cross support frame 102 can provide a fixed space for the supporting ring 103. The supporting frame 102 can rotate on the liquid storage tank 101, thereby driving the supporting ring 103 to rotate. The supporting ring 103 can provide a fixed space for multiple sleeved rotating shafts 104, and multiple circular workpieces with circular holes can be respectively mounted on the multiple sleeved rotating shafts 104. The limiting notch ring 105 can limit the multiple circular workpieces with circular holes mounted on the multiple sleeved rotating shafts 104 to ensure that the multiple circular workpieces with circular holes will not separate from the multiple sleeved rotating shafts 104. The limiting notch ring 105 is a three-quarter ring. The ring can be used to limit the multiple circular workpieces with circular holes, and the phosphating workpieces can be discharged through the notch.

[0033] The two circular workpieces with circular holes are respectively put on the two uppermost sleeve fixed shafts 104, and then the cross support frame 102 is used to drive the supporting ring 103 to rotate intermittently, and the intermittent rotation of the supporting ring 103 is used to drive the multiple sleeve fixed shafts 104 to rotate intermittently. When the supporting ring 103 stops, the next group of two sleeve fixed shafts 104 will move to the top. At this time, two new circular workpieces with circular holes are put on the two upper sleeve fixed shafts 104, and the cycle is carried out in sequence to achieve the goal of putting multiple circular workpieces with circular holes on multiple sleeve fixed shafts 104. When the multiple circular workpieces with circular holes are moved into the liquid storage empty tank 101, they can come into contact with the phosphating liquid. At this time, the phosphating liquid will be evenly attached to the workpiece. When the workpiece moves to the rightmost side, it will be discharged, and the phosphating pretreatment of multiple workpieces is achieved in the cycle.

[0034] Example 2: Please refer to Figure 1-3 , 5, 6 and 8, the present invention provides a technical solution: two contact ring plates 201 are slidingly connected to the limiting gap ring 105, a bidirectional lead screw 202 is rotatably connected to the limiting gap ring 105, both ends of the bidirectional lead screw 202 are respectively connected to the two contact ring plates 201 through threaded transmission, and the bidirectional lead screw 202 is rotatably connected to the liquid storage tank 101 and sealed.

[0035] Furthermore, two sliding grooves are provided on the limiting gap ring 105. The two sliding grooves on the limiting gap ring 105 can provide sliding space for the two contact ring plates 201, and the two contact ring plates 201 can contact multiple circular workpieces with circular holes. At this time, when the multiple circular workpieces with circular holes rotate, they will contact the two contact ring plates 201, and the multiple circular workpieces with circular holes will rotate, which can ensure that the multiple circular workpieces with circular holes can be evenly contacted with the phosphating liquid, so that the phosphating liquid can be evenly attached to the workpieces. The threads at both ends of the bidirectional screw 202 have opposite rotation directions. After rotating the bidirectional screw 202, the two contact ring plates 201 can be driven to slide inward or outward at the same time, thereby changing the distance between the two contact ring plates 201, which can ensure that the two contact ring plates 201 can contact circular workpieces with circular holes of different diameters, allowing workpieces with different diameters to rotate during the phosphating process, realizing phosphating treatment of workpieces with different diameters, and improving phosphating efficiency.

[0036] Example 3: Please refer to Figure 1-4 , 6 and 8, the present invention provides a technical solution: the outer ends of the two contact ring plates 201 are fixedly connected to the bearing swivels 301, the two bearing swivels 301 are rotatably connected to the discharging rollers 302, the inner tangent surfaces of the two discharging rollers 302 and the inner end surfaces of the two contact ring plates 201 are in the same plane, the two bearing swivels 301 are fixedly connected to the reduction motors I303, and the output shafts of the two reduction motors I303 are fixedly connected to the two discharging rollers 302 respectively.

[0037] Furthermore, the two bearing swivel seats 301 can provide rotation space for the two discharge rollers 302. The outer end surfaces of the two discharge rollers 302 are adhered with a rubber layer. The provision of the rubber layer can increase friction. When the phosphating workpiece rotates to the far right and stops, it will contact the two discharge rollers 302. The two discharge rollers 302 are rotated to drive the phosphating workpiece to move toward the outer end, thereby realizing the discharge processing of the phosphating workpiece. Starting the two reduction motors I303 can drive the two discharge rollers 302 to rotate. When the supporting ring 103 stops, the two reduction motors I303 are started, and when the supporting ring 103 rotates, the two reduction motors I303 stop. This can avoid waste of power. Only when it moves to the far right will the two discharge rollers 302 rotate to realize automatic discharge of the workpiece.

[0038] Example 4: Please refer to Figure 1-3 The present invention provides a technical solution: the liquid storage empty box 101 is rotatably connected to two supporting shafts 401, and a groove conveyor belt 402 is transmission-connected between the two supporting shafts 401.

[0039] Furthermore, the two supporting shafts 401 can provide supporting space for the groove conveyor belt 402. When the two supporting shafts 401 rotate, the groove conveyor belt 402 can be driven to rotate. The rotation of the groove conveyor belt 402 can be used to move the workpieces that have been discharged and completed phosphating, so as to realize the collection of the workpieces. There are two grooves on the groove conveyor belt 402. After the workpiece moves onto the groove conveyor belt 402, it will fall into the groove, preventing the workpiece from moving arbitrarily on the groove conveyor belt 402, thereby further improving the transmission efficiency of the workpiece.

[0040] Example 5: Please refer to Figure 1 、 2 , 9 and 10, the present invention provides a technical solution: a double-groove slide cavity 501 is fixedly connected to the liquid storage empty box 101, the double-groove slide cavity 501 is located directly above the supporting ring 103, and a transverse support plate 502 is slidably connected to the double-groove slide cavity 501.

[0041] Furthermore, multiple workpieces can be placed in the double-groove slide cavity 501 in sequence, and then the workpieces will slide out through the double-groove slide cavity 501 and fall onto the two sleeve fixed rotating shafts 104 located above, and the transverse pallet 502 can realize the shielding of the lower opening of the double-groove slide cavity 501. When the workpiece needs to fall onto the two sleeve fixed rotating shafts 104 located above, the transverse pallet 502 is moved to the right to release the shielding of the double-groove slide cavity 501. At this time, the workpiece located in the double-groove slide cavity 501 will fall, realizing the automatic addition of workpieces.

[0042] Example 6: Please refer to Figure 1 、 2 , 9 and 10, the present invention provides a technical solution: two limiting horizontal sliding columns 601 are slidably connected to the double-groove sliding cavity 501, the outer ends of the two limiting horizontal sliding columns 601 are fixedly connected to the semicircular horizontal column 602, and the two limiting horizontal sliding columns 601 are both sleeved with springs I603, the inner ends of the two springs I603 are in contact with the double-groove sliding cavity 501, and the outer ends of the two springs I603 are in contact with the semicircular horizontal column 602.

[0043] Furthermore, the two limiting transverse sliding columns 601 can be used to limit the workpiece in the double-grooved slide cavity 501, and the semicircular transverse column 602 can be used to drive the two limiting transverse sliding columns 601 to move inward. The elastic force generated by the two springs I603 acts on the semicircular transverse column 602, allowing the two limiting transverse sliding columns 601 to move outward. When the transverse support plate 502 moves to the right, the two limiting transverse sliding columns 601 will move inward to limit the workpiece. At this time, the workpiece will not be able to fall into the double-grooved slide cavity 501, and when the transverse support plate 502 moves to the left to block the double-grooved slide cavity 501, the two limiting transverse sliding columns 601 will move outward, releasing the limiting treatment of the double-grooved slide cavity 501, and allowing the workpiece to fall below the double-grooved slide cavity 501.

[0044] Example 7: Please refer to Figure 1 、 2 , 9 and 10, the present invention provides a technical solution: the double-groove slide cavity 501 is fixedly connected with a hinged bracket 701, the hinged bracket 701 is rotatably connected with a linkage rocker 702, the two ends of the linkage rocker 702 are respectively in contact with the transverse support plate 502 and the semicircular horizontal column 602, and the liquid storage empty tank 101 is rotatably connected with a linkage cam 703, which is in contact with the transverse support plate 502.

[0045] Furthermore, the articulated bracket 701 can provide space for the linkage rocker plate 702 to rotate. When the transverse moving plate 502 moves to the right, the bottom of the linkage rocker plate 702 will also move to the right, and the top of the linkage rocker plate 702 will move to the left, thereby driving the two limiting transverse sliding columns 601 to move to the left through the semicircular transverse column 602. At this time, the workpiece will not be able to fall under the double-groove slide cavity 501. After the workpiece in the double-groove slide cavity 501 is discharged, the transverse moving plate 502 will move to the left, and the two limiting transverse sliding columns 601 will be driven to move to the right through the two springs I603, releasing the restriction on the double-groove slide cavity 501. At this time, the workpiece will fall under the double-groove slide cavity 501, and circulate in sequence to complete the automated processing of the workpiece. The eccentric rotation of the linkage cam 703 is used to drive the transverse moving plate 502 to slide left and right in a cycle to achieve the addition and discharge of workpieces.

[0046] Example 8: Please refer to Figure 1 、 2 , 8 and 9, the present invention provides a technical solution: the liquid storage empty tank 101 is fixedly connected to a reduction motor II801, the output shaft of the reduction motor II801 is fixedly connected to a transmission pulley I802, the rear ends of the two supporting shafts 401 are fixedly connected to a transmission pulley II803, the rear end of the linkage cam 703 is fixedly connected to a transmission pulley III804, and the transmission pulley I802, the two transmission pulleys II803 and the transmission pulley III804 are connected through a transmission belt.

[0047] Furthermore, after starting the reduction motor II801, the transmission pulley I802 can be driven to rotate, and the rotating transmission pulley I802 will drive the two transmission pulleys II803 and the transmission pulley III804 to rotate through the conveyor belt, and finally complete the rotation of the two supporting shafts 401 and the linkage cam 703, realizing the synchronous addition and discharge of workpieces.

[0048] Example 9: Please refer to Figure 1-7 The present invention provides a technical solution: a semicircular gear 901 is fixedly connected to the output shaft of the reduction motor II801, a linkage gear 902 is fixedly connected to the rear end of the cross support frame 102, and the semicircular gear 901 and the linkage gear 902 are meshed and transmitted.

[0049] Furthermore, after starting the reduction motor II801, the semicircular gear 901 can be driven to rotate. When the semicircular gear 901 is meshed and in contact with the linkage gear 902, the linkage gear 902 can be driven to rotate. The rotation of the linkage gear 902 is used to drive the cross support frame 102 to rotate. When the semicircular gear 901 is not in contact with the linkage gear 902, the linkage gear 902 will not rotate. At this time, the intermittent rotation of the cross support frame 102 is realized, and the intermittent rotation of the cross support frame 102 is used to realize the addition and discharge of workpieces. When the cross support frame 102 stops rotating, the workpiece is placed on the two fixed rotating shafts 104 located above and the discharge of the workpiece is completed by phosphating. When the cross support frame 102 rotates, the workpiece is added to the double-groove slide cavity 501.

[0050] Example 10: Please refer to Figure 1-7 The present invention provides a technical solution: the front and rear ends of the liquid storage empty tank 101 are fixedly connected to two supporting slides 903, and the two supporting slides 903 are slidably connected to a stop ring 904, and the two stop rings 904 are respectively in contact with the front and rear ends of the cross support frame 102, and the two stop rings 904 are respectively provided with a spring II905, and the outer ends of the two springs II905 are respectively in contact with the two supporting slides 903.

[0051] Furthermore, the two supporting slides 903 can provide sliding space for the two stopping rings 904, and the two stopping rings 904 can be used to limit the cross support frame 102, and the elastic force generated by the two springs II905 acts on the two stopping rings 904 to ensure that the two stopping rings 904 will always be in contact with the cross support frame 102, thereby completing the fixation of the cross support frame 102. When the semicircular gear 901 is engaged with the linkage gear 902, the cross support frame 102 can be driven to rotate. When the semicircular gear 901 is out of contact with the linkage gear 902, the cross support frame 102 needs to be limited to prevent the cross support frame 102 from rotating arbitrarily, ensuring that the cross support frame 102 rotates when it needs to rotate and stops when it needs to stop.

[0052] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0053] While the embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that various changes, modifications, substitutions, and alterations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A workpiece pretreatment device for a powder coating line, characterized by: The invention comprises a liquid storage empty tank (101) and a cross support frame (102) rotatably connected to the liquid storage empty tank (101); a supporting ring (103) is fixedly connected to the cross support frame (102); a plurality of sleeve fixed rotating shafts (104) are evenly fixedly connected to the outer end surface of the supporting ring (103); the plurality of sleeve fixed rotating shafts (104) are divided into two rows; the positions of the sleeve fixed rotating shafts (104) in the two rows correspond to each other; the corresponding sleeve fixed rotating shafts (104) are on the same straight line; and a limiting notch ring (105) is fixedly connected to the liquid storage empty tank (101).

2. The workpiece pretreatment equipment for a powder coating line according to claim 1, characterized in that: Two contact ring plates (201) are slidably connected to the limiting gap ring (105), a bidirectional lead screw (202) is rotatably connected to the limiting gap ring (105), two ends of the bidirectional lead screw (202) are respectively connected to the two contact ring plates (201) through threaded transmission, and the bidirectional lead screw (202) is rotatably connected to the liquid storage empty box (101) and sealed.

3. The workpiece pretreatment equipment for a powder coating line according to claim 2, characterized in that: The outer ends of the two contact ring plates (201) are fixedly connected to bearing swivels (301), and the two bearing swivels (301) are rotatably connected to discharge rollers (302), the inner tangent surfaces of the two discharge rollers (302) and the inner end surfaces of the two contact ring plates (201) are in the same plane, and the two bearing swivels (301) are fixedly connected to reduction motors I (303), and the output shafts of the two reduction motors I (303) are fixedly connected to the two discharge rollers (302) respectively.

4. The workpiece pretreatment equipment for a powder coating line according to claim 3, characterized in that: The liquid storage empty box (101) is rotatably connected to two supporting shafts (401), and a groove conveyor belt (402) is transmission-connected between the two supporting shafts (401).

5. The workpiece pretreatment equipment for a powder coating line according to claim 4, characterized in that: The liquid storage empty box (101) is fixedly connected with a double-grooved sliding cavity (501), which is located directly above the supporting ring (103). A transverse support plate (502) is slidably connected to the double-grooved sliding cavity (501).

6. The workpiece pretreatment equipment for a powder coating line according to claim 5, characterized in that: Two limiting transverse sliding columns (601) are slidably connected to the double-grooved sliding cavity (501), and the outer ends of the two limiting transverse sliding columns (601) are fixedly connected to a semicircular transverse column (602). The two limiting transverse sliding columns (601) are both sleeved with a spring I (603), and the inner ends of the two springs I (603) are in contact with the double-grooved sliding cavity (501), and the outer ends of the two springs I (603) are in contact with the semicircular transverse column (602).

7. The workpiece pretreatment equipment for a powder coating line according to claim 6, characterized in that: The double-groove sliding cavity (501) is fixedly connected to a hinged bracket (701), and a linkage rocker (702) is rotatably connected to the hinged bracket (701). The two ends of the linkage rocker (702) are respectively in contact with the transverse support plate (502) and the semicircular horizontal column (602). The liquid storage empty box (101) is rotatably connected to a linkage cam (703), and the linkage cam (703) is in contact with the transverse support plate (502).

8. The workpiece pretreatment equipment for a powder coating line according to claim 7, characterized in that: The liquid storage empty tank (101) is fixedly connected to a reduction motor II (801), the output shaft of the reduction motor II (801) is fixedly connected to a transmission pulley I (802), the rear ends of the two supporting rotating shafts (401) are fixedly connected to a transmission pulley II (803), the rear end of the linkage cam (703) is fixedly connected to a transmission pulley III (804), and the transmission pulley I (802), the two transmission pulleys II (803) and the transmission pulley III (804) are connected through a transmission belt.

9. The workpiece pretreatment equipment for a powder coating line according to claim 8, characterized in that: A semicircular gear (901) is fixedly connected to the output shaft of the reduction motor II (801), and a linkage gear (902) is fixedly connected to the rear end of the cross support frame (102). The semicircular gear (901) and the linkage gear (902) are meshed and transmission-connected.

10. The workpiece pretreatment equipment for a powder coating line according to claim 9, characterized in that: The front and rear ends of the liquid storage empty box (101) are fixedly connected to two supporting slides (903), and the two supporting slides (903) are slidably connected to a stop ring (904). The two stop rings (904) are respectively in contact with the front and rear ends of the cross support frame (102). The two stop rings (904) are respectively provided with a spring II (905), and the outer ends of the two springs II (905) are respectively in contact with the two supporting slides (903).

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