A hanging feeding device for phosphating treatment of metal plates

Abstract

The present invention discloses a suspended feeding device for phosphating treatment of metal plates, which relates to the field of conveying technology and includes a guide rail and a sliding seat movably engaged with the guide rail, a rigid frame installed at the bottom of the sliding seat, a horizontal rod installed at the bottom end of the rigid frame, and two sets of suspension units installed on the bottom surface of the horizontal rod, wherein the suspension unit includes a No. 1 shaft that cannot rotate relative to the horizontal rod and a No. 2 shaft movably engaged with the horizontal rod. When the present invention immerses the metal plates into the phosphating tank for conveyance, the plates suspended by the two adjacent No. 1 shafts always remain parallel to each other and stationary relative to the horizontal rod, while the plate suspended by the No. 2 shaft located between the two plates swings back and forth around a vertical axis, so that the phosphating solution between the adjacent plates can flow, and the phosphating solution between the adjacent plates can be exchanged with the phosphating solution in the rest of the phosphating tank, thereby ensuring that the phosphating degree of each plate surface is consistent.

Description

Technical Field

[0001] The invention relates to the technical field of conveying, in particular to a metal plate phosphating treatment hanging type feeding device. Background Art

[0002] Phosphating is the process of treating metal workpieces with an acidic solution containing dihydrogen phosphate, creating an insoluble phosphate film approximately 1-10 microns thick. The core purpose of this coating is to enhance the corrosion resistance of the sheet material, strengthen paint adhesion, and improve subsequent processing performance. Phosphating typically involves storing the solution in a phosphating bath, into which the sheet material is fed via a feeder.

[0003] The Chinese utility model patent with publication number CN216037228U discloses a phosphating pool feeding device, which includes a phosphating treatment pool, a left support frame, a right support frame, a slide plate, a clamping fixture and a driving cylinder. The left support frame is arranged on the left side of the phosphating treatment pool, the right support frame is arranged on the right side of the phosphating treatment pool, the slide plate is movably connected to the left support frame, the slide plate is movably connected to the right support frame, the clamping fixture is arranged above the slide plate, and the driving cylinder is fixedly connected to the left support frame.

[0004] Chinese utility model patent publication number CN220948085U discloses a feeding device for steel pipe phosphating, which relates to the field of production and processing technology. It includes a main body, a limiter and a moving structure. Two groups of evenly arranged universal wheels are provided at the bottom of one side of the main body, and an auxiliary groove is opened inside the main body. The limiter is inserted into the auxiliary groove. The moving structure is provided on the left side of the main body, and the right end of the moving member of the moving structure contacts the left end of the main body.

[0005] During the actual phosphating treatment, after all the plates are immersed in the phosphating pool, each plate moves synchronously along a predetermined path, the solution flows relative to the plate, and the solution flow rate at each edge of the plate is basically the same, which makes it difficult for the solution between adjacent plates to exchange with the external solution. In this way, only the surface of the first plate can be fully phosphated, while the surface of the remaining plates is not phosphated enough. There is a solution in the industry that is to set the suspension rod of the suspended plate to a rotatable form. After the plate is immersed in the solution, the plate is driven to rotate continuously by external force to increase the contact degree between the surface of each plate and the solution. Although this method is feasible, it will greatly increase the resistance of the solution to the plate, and the required energy consumption is very high. In this way, how to improve the contact effect between the solution and the plate to improve the phosphating effect without significantly increasing the resistance of the solution to the plate is a problem that needs to be solved by those skilled in the art. Summary of the Invention

[0006] The purpose of the present invention is to provide a metal plate phosphating treatment hanging feeding device to solve the above-mentioned deficiencies in the prior art.

[0007] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a metal plate phosphating suspension feeding device, comprising a guide rail and a sliding seat movably engaged with the guide rail, a rigid frame installed at the bottom of the sliding seat, a horizontal rod installed at the bottom end of the rigid frame, and two groups of suspension units installed on the bottom surface of the horizontal rod, the suspension unit comprising a No. 1 shaft that cannot produce relative rotation with the horizontal rod and a No. 2 shaft movably engaged with the horizontal rod.

[0008] The axes of the No. 1 and No. 2 shafts are both in a vertical state, and the No. 1 and No. 2 shafts are evenly spaced, and hooks are installed at the bottom ends of the No. 1 and No. 2 shafts; the No. 2 shaft has a first state and a second state, and in the first state of the No. 2 shaft, the plates suspended by the various hooks are parallel to each other; in the second state of the No. 2 shaft, the plates suspended by adjacent hooks are not parallel.

[0009] As a preferred technical solution of the present invention, the second shaft is provided with a coaxial gear therewith, the horizontal rod is a hollow structure and a slide is installed in the horizontal rod for sliding in the horizontal direction, and the positions corresponding to the gears on the slide are fixed with transmission teeth that cooperate with the gears.

[0010] As a preferred technical solution of the present invention, a protrusion is fixedly installed on the slide, and two limit blocks corresponding to the positions of the protrusions are fixedly installed on the inner wall of the horizontal rod; a horizontal coil spring is fixedly connected between the slide and the inner wall of the horizontal rod.

[0011] As a preferred technical solution of the present invention, a lifting rod is installed on the end of the horizontal rod for sliding in the vertical direction, and a stainless steel shell is fixedly installed on the bottom end of the lifting rod; a push-pull rod is fixedly installed on the end of the slide board, a roller is installed at one end of the push-pull rod, and an arc-shaped plate that fits the roller is fixedly installed on the lifting rod.

[0012] As a preferred technical solution of the present invention, a ball bearing that cooperates with the second shaft is installed on the horizontal rod.

[0013] As a preferred technical solution of the present invention, a positioning groove is provided on the top of the hook, and a receiving groove is provided inside the first and second shafts, and a positioning pin that cooperates with the positioning groove is movably installed in the receiving groove.

[0014] As a preferred technical solution of the present invention, the second shaft and the gear slide together in the vertical direction, a horizontal first cylindrical block is installed on the positioning pin, and a control plate is slidably installed on both the first and second shafts in the horizontal direction, and a first inclined groove is provided on the control plate to cooperate with the first cylindrical block.

[0015] As a preferred technical solution of the present invention, a semicircular plate coaxial with the No. 2 axis is rotatably installed on the bottom surface of the horizontal rod corresponding to the position of each No. 2 axis, and a second cylindrical block parallel to the first cylindrical block is installed on the lower surface of the semicircular plate through a rigid rod, and a second inclined groove cooperating with the second cylindrical block is provided on the control panel of the No. 2 axis.

[0016] As a preferred technical solution of the present invention, a second cylindrical block parallel to the first cylindrical block is installed on the bottom surface of the horizontal rod corresponding to each No. 1 axis through a rigid rod, and a second inclined groove cooperating with the second cylindrical block is provided on the control panel of the No. 1 axis.

[0017] As a preferred technical solution of the present invention, the first cylindrical block is rotationally matched with the positioning pin, and the second cylindrical block is rotationally matched with the rigid rod.

[0018] In the above-mentioned technical solution, the present invention provides a suspended feeding device for phosphating metal plates. When the metal plates are immersed in the phosphating tank for transportation, the plates suspended on two adjacent first shafts always remain parallel to each other and stationary relative to the horizontal rod. The plate suspended on the second shaft, located between the two plates, oscillates back and forth about a vertical axis, allowing the phosphating solution between the adjacent plates to flow and exchange with the phosphating solution in the rest of the tank, thereby ensuring a consistent degree of phosphating on the surfaces of all plates. It should be noted that in the present invention, only the plates suspended on the second shaft oscillate within a certain amplitude. Compared with the traditional method of driving each plate to rotate continuously, this greatly reduces the resistance the plates experience from the phosphating solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0020] Figure 1 This is a first perspective view of the feeding device for phosphating metal plates in Example 1;

[0021] Figure 2 This is a second perspective view of the feeding device for phosphating metal plates in Example 1;

[0022] Figure 3 for Figure 2 A magnified schematic diagram of point A in the middle;

[0023] Figure 4 This is a schematic diagram of the status of the metal plate during the working process in Example 1;

[0024] Figure 5 This is a schematic diagram of part of the internal structure of the horizontal rod in Example 2;

[0025] Figure 6 This is a partial structural diagram of the suspension unit in Example 3.

[0026] Description of reference numerals:

[0027] 1. Guide rail; 2. Sliding seat; 3. Rigid frame; 4. Horizontal rod; 5. Suspension unit; 501. Axis No. 1; 502. Axis No. 2; 503. Hook; 504. Positioning groove; 505. Accommodating groove; 506. Positioning pin; 507. First cylindrical block; 508. Control board; 509. First inclined groove; 510. Semicircular plate; 511. Second cylindrical block; 512. Second inclined groove; 6. Gear; 7. Slide plate; 8. Transmission tooth; 9. Bump; 10. Limit block; 11. Coil spring; 12. Lifting rod; 13. Stainless steel shell; 14. Push-pull rod; 15. Roller; 16. Arc plate. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0029] Example 1

[0030] like Figure 1 、 Figure 2 and Figure 3 As shown, this embodiment provides a suspended feeding device for metal sheet phosphating treatment, which is used to suspend and convey multiple metal sheets. During conveyance, the metal sheets are immersed in a phosphating bath for phosphating treatment. The device specifically includes a guide rail 1 and a sliding seat 2 that flexibly engages with the guide rail 1. The guide rail 1 is composed of multiple sections with different heights. The guide rail 1 passes over the phosphating bath. A conveyor chain is installed within the guide rail 1. The sliding seat 2 is connected to the conveyor chain. When the conveyor chain moves, it drives the sliding seat 2 along the guide rail 1. A rigid frame 3 is mounted at the bottom of the sliding seat 2. The rigid frame 3 has a Y-shaped structure, and a horizontal rod 4 is mounted at the bottom end of the rigid frame 3. Two sets of suspension units 5 are mounted on the bottom surface of the horizontal rod 4. The suspension units 5 include a first shaft 501 and a second shaft 502. The first shaft 501 slides vertically with the horizontal rod 4, and the second shaft 502 flexibly engages with the horizontal rod 4. That is, the second shaft 502 can both rotate relative to the horizontal rod 4 and rise and fall relative to the horizontal rod 4.

[0031] The axes of the first and second shafts 501, 502 are both in a vertical state, and the first and second shafts 501, 502 are evenly spaced. The bottom ends of the first and second shafts 501, 502 are both equipped with hooks 503. The hooks 503 include an arc-shaped upper hook and a lower hook. The upper hook and the first or second shaft 501, 502 slide together, and the upper hook rotates around its axis during the sliding process. The second shaft 502 has a first state and a second state. In the first state of the second shaft 502, the plates suspended by the various hooks 503 are parallel to each other. Figure 1 In the second state of the second axis 502, the plates suspended by adjacent hooks 503 are not parallel, as shown Figure 2 and Figure 3 shown.

[0032] In the initial state, each plate is placed on the external storage rack in a state parallel to each other, and the sliding seat 2 moves along the guide rail 1 to the top of the storage rack. Then, the position of the storage rack is adjusted manually or by a mechanical arm, and the position of each plate is adjusted synchronously so that the hook 503 corresponds to the position of the hole groove on the plate. Then, each plate is translated, and the hook 503 is pushed to move by the plate, so that the hook 503 enters the inclined state. Specifically, the upper hook of the hook 503 rotates around its axis until the lower hook of the hook 503 enters the hole groove on the plate. At this time, the external storage rack can be separated from the plate, and the plate will slide downward along the hook 503 under the action of gravity, and the hook 503 is restored to Figure 1 The state shown; at this point, the suspension of the plate is completed; it should be noted that the plate suspended on the No. 1 shaft 501 will not drive the No. 1 shaft 501 to rotate when it is subjected to the force from the phosphating solution, while the plate suspended on the No. 2 shaft 502 will drive the No. 2 shaft 502 to rotate when it is subjected to the force from the phosphating solution, that is, the plate suspended on the No. 2 shaft 502 can swing in the phosphating tank.

[0033] During the transportation process, each plate and hook 503 are immersed in the phosphating solution. Figure 4 Take the example to illustrate, the arrow direction in the figure is the conveying direction of the plate; Figure 4 In this state (top view), the leftmost plate is suspended on the second axis 502. It is rotated counterclockwise by a certain angle compared to the initial state, so that the plate on its right is not completely blocked. Part of the phosphating liquid will flow from one side of it and the adjacent plate to the other side, thereby promoting the exchange of the phosphating liquid between the two plates and the external phosphating liquid. When the leftmost plate is rotated clockwise by a certain angle to reset, it will also have a pushing effect on the phosphating liquid between it and the adjacent plate, which will also promote the flow of the phosphating liquid. In this way, the phosphating degree of the surface of each plate is guaranteed to be consistent.

[0034] In summary, in this embodiment, when metal sheets are immersed in the phosphating tank for transport, the sheets suspended on two adjacent first shafts 501 remain parallel to each other, while the sheet suspended on the second shaft 502, located between the two sheets, oscillates back and forth. This allows the phosphating solution to flow between the adjacent sheets, thereby promoting the exchange of the phosphating solution between the adjacent sheets with the remaining phosphating solution in the tank and ensuring a consistent phosphating degree across the surfaces of all sheets. In this embodiment, only the sheets suspended on the second shaft oscillate within a certain range. Compared to conventional methods of driving each sheet in continuous rotation, this significantly reduces the resistance to the phosphating solution experienced by the sheets.

[0035] Example 2

[0036] Regarding how to drive the second shaft 502 to rotate back and forth so as to realize the reciprocating swing of the suspended plate, the first consideration is to install an electric drive source, such as a motor, on the horizontal rod 4 to directly drive the second shaft 502 to rotate. However, in actual operation, the phosphating liquid will splash onto the motor housing and cause damage to the motor. Long-term use is bound to be very costly, and the motor is only required to work when passing through the phosphating tank, which adds a burden to the motor programming cost. Based on this, the following design is also carried out in this embodiment to solve the above problems.

[0037] like Figure 5 As shown, the second shaft 502 is sleeved with a coaxial gear 6, and the second shaft 502 and the gear 6 always rotate synchronously. The horizontal rod 4 is a hollow structure and a slide plate 7 is installed in the horizontal rod 4 for sliding in the horizontal direction. The positions of the slide plates 7 corresponding to the gear 6 are fixedly installed with transmission teeth 8 that cooperate with the gear 6; the horizontal rod 4 is installed with a ball that cooperates with the second shaft 502 to reduce the friction between the two. A protrusion 9 is fixedly installed on the slide 7, and two limit blocks 10 corresponding to the position of the protrusion 9 are fixedly installed on the inner wall of the horizontal rod 4, so that the slide 7 can only slide back and forth within a certain range, thereby ensuring that the gear 6 is always in meshing with its corresponding transmission tooth 8; a horizontal coil spring 11 is fixedly connected between the slide 7 and the inner wall of the horizontal rod 4; a lifting rod 12 is slidably installed at the end of the horizontal rod 4 in the vertical direction, and a stainless steel shell 13 made of stainless steel is fixedly installed at the bottom of the lifting rod 12; a push-pull rod 14 is fixedly installed at the end of the slide 7, and a roller 15 is installed at one end of the push-pull rod 14. A curved plate 16 that fits with the roller 15 is fixedly installed on the lifting rod 12. In this embodiment, the width of the phosphating tank is 4 meters, and the stainless steel shell 13 is a rectangular parallelepiped shell with a width of 3 meters, a height of 10 centimeters, and a length of 20 centimeters.

[0038] Specifically, when the plate is immersed in the phosphating tank, the stainless steel shell 13 will float in the phosphating tank. The buoyancy of the phosphating tank causes the stainless steel shell 13, the lifting rod 12 and the arc plate 16 to rise. During the rising process of the arc plate 16, the roller 15 and the push-pull rod 14 are pushed to translate. The push-pull rod 14 pushes the slide plate 7 to translate to overcome the tension of the coil spring 11. During the translation of the slide plate 7, the transmission tooth 8 causes the gear 6 engaged therewith to rotate, and the gear 6 drives the second shaft 502 to rotate, and finally causes the plate suspended by the second shaft 502 to rotate; when the plate translates in the phosphating tank, it will push the phosphating liquid, and waves will be generated on the surface of the phosphating tank (in this embodiment, the speed of the sliding seat 2 during transportation changes, that is, the plate periodically accelerates and decelerates in the phosphating tank), thereby causing the stainless steel shell 13 to move up and down, and the coil spring 11 will continue to expand and contract, and finally causes the second shaft 502 and the plate suspended thereon to swing back and forth. Figure 5 For example, Figure 5 In this state, the stainless steel housing 13 has reached its top dead center and will then descend as indicated by the arrow in the figure. The slide plate 7 will translate in the direction indicated by the arrow, and the second shaft 502 will rotate in the direction indicated by the arrow. It should be noted that in this embodiment, a push plate that can promote the flow of the phosphating solution can also be provided in the phosphating tank to achieve undulations on the surface of the phosphating solution.

[0039] To sum up, in this embodiment, the reciprocating swing effect of the No. 2 shaft 502 and the plate suspended thereon can be achieved without configuring an additional power source, and the No. 2 shaft 502 and the plate suspended thereon will only swing when the plate is immersed in the phosphating tank and conveyed; in the process of hanging the plate on the hanging unit 5, the No. 2 shaft 502 can be maintained in the first state to facilitate the hanging of the plate.

[0040] Example 3

[0041] During the actual transportation process, since the upper hook of the hook 503 can slide relative to the first shaft 501 and the second shaft 502, when the plate is subjected to the force of the phosphating liquid during translation, the hook 503 may be driven to move relative to the first shaft 501 and the second shaft 502, resulting in collisions between adjacent plates. Obviously, this is not allowed. To address this problem, this embodiment has been designed as follows.

[0042] like Figure 6 As shown, the top of the hook 503 has a positioning groove 504, and the first and second shafts 501 and 502 each have a receiving groove 505. A positioning pin 506 is movably mounted in the receiving groove 505 and engages with the positioning groove 504. When the positioning pin 506 is inserted into the positioning groove 504, the hook 503 will not slide relative to the first and second shafts 501 and 502, and the board will not collide.

[0043] like Figure 6As shown, the gear 6 rotates with the horizontal rod 4, the second shaft 502 slides with the gear 6 in the vertical direction, and an elastic member is connected between the two. The elastic member can be a spring or an elastic rope. A horizontal first cylindrical block 507 is installed on the positioning pin 506, and the first cylindrical block 507 rotates with the positioning pin 506; a control plate 508 is slidably installed on both the first shaft 501 and the second shaft 502 in the horizontal direction, and a first inclined groove 509 is provided on the control plate 508 to cooperate with the first cylindrical block 507; when the control plate 508 moves horizontally, the interaction force between the first inclined groove 509 and the first cylindrical block 507 will cause the first cylindrical block 507 and the positioning pin 506 to produce vertical displacement relative to the first shaft 501 or the second shaft 502; specifically, Figure 6 In the embodiment, when the control plate 508 moves to the right, the first cylindrical block 507 and the positioning pin 506 rise, and the positioning pin 506 separates from the positioning groove 504.

[0044] like Figure 6 As shown, a semicircular plate 510 is rotatably mounted on the bottom surface of the horizontal rod 4 at a position corresponding to each second shaft 502, coaxial with the second shaft 502. A second cylindrical block 511, parallel to the first cylindrical block 507, is mounted on the lower surface of the semicircular plate 510 via a rigid rod. A second inclined slot 512 is defined on the control plate 508 of the second shaft 502, which mates with the second cylindrical block 511. When the second shaft 502 moves upward relative to the horizontal rod 4, the control plate 508 also moves upward relative to the horizontal rod 4. The interaction between the second inclined slot 512 and the second cylindrical block 511 causes the control plate 508 to move rightward, thereby separating the positioning pin 506 from the positioning slot 504.

[0045] Specifically, in the initial state, the second shaft 502 is at its top dead center relative to the horizontal rod 4, and the positioning pin 506 is also at its top dead center relative to the second shaft 502. When the hook 503 suspends the plate, the positioning slot 504 corresponds to the position of the positioning pin 506 (it should be noted that the positioning slot 504 and the positioning pin 506 do not need to be completely aligned, and there can be a gap between them). The gravity of the plate drives the hook 503, the second shaft 502 and the control plate 508 to descend a certain distance relative to the horizontal rod 4, the elastic member deforms, and the control plate 508 moves to the left to reach Figure 6In the illustrated state, the positioning pin 506 is also inserted into the positioning slot 504. This prevents the hook 503 from sliding relative to the second shaft 502 while the plate is suspended by the second shaft 502. When the second shaft 502 rotates, the control plate 508 and the semicircular plate 510 rotate synchronously. After phosphating, the plate is lifted by an external force. The plate's gravity no longer acts on the hook 503. The elastic member causes the hook 503, the second shaft 502, and the control plate 508 to rise a certain distance relative to the horizontal rod 4 and reset. The positioning slot 504 separates from the positioning pin 506, allowing the operator to adjust the position of the hook 503 to separate the plate from the hook 503.

[0046] It should be noted that a second cylindrical block 511, parallel to the first cylindrical block 507, is mounted on the bottom surface of the horizontal rod 4 at a position corresponding to each first shaft 501 via a rigid rod. The second cylindrical block 511 is rotatably engaged with the rigid rod, and the control plate 508 of the first shaft 501 is provided with a second inclined slot 512 that engages with the second cylindrical block 511. Therefore, when a plate suspended from the first shaft 501 is in the suspended state, the hook 503 will not slide relative to the first shaft 501.

[0047] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A metal plate phosphating suspension feeding device, comprising a guide rail (1) and a sliding seat (2) movably matched with the guide rail (1), a rigid frame (3) being mounted on the bottom of the sliding seat (2), a horizontal rod (4) being mounted on the bottom end of the rigid frame (3), and two sets of suspension units (5) being mounted on the bottom surface of the horizontal rod (4), characterized in that: The suspension unit (5) comprises a first shaft (501) which is unable to generate relative rotation with the horizontal rod (4) and a second shaft (502) which is movably matched with the horizontal rod (4); The axes of the first shaft (501) and the second shaft (502) are both in a vertical state, and the first shaft (501) and the second shaft (502) are evenly spaced apart. The bottom ends of the first shaft (501) and the second shaft (502) are both installed with hooks (503); the second shaft (502) has a first state and a second state. In the first state of the second shaft (502), the plates suspended by the various hooks (503) are parallel to each other; in the second state of the second shaft (502), the plates suspended by adjacent hooks (503) are not parallel. A coaxial gear (6) is sleeved on the second shaft (502), the horizontal rod (4) is a hollow structure, and a slide plate (7) is installed in the horizontal rod (4) for sliding in the horizontal direction, and transmission teeth (8) that cooperate with the gear (6) are fixedly installed at positions corresponding to the gear (6) on the slide plate (7); A protrusion (9) is fixedly mounted on the slide plate (7), and two limit blocks (10) corresponding to the positions of the protrusions (9) are fixedly mounted on the inner wall of the horizontal rod (4); a horizontal coil spring (11) is fixedly connected between the slide plate (7) and the inner wall of the horizontal rod (4); A lifting rod (12) is mounted on the end of the horizontal rod (4) so ​​as to slide in the vertical direction, and a stainless steel housing (13) is fixedly mounted on the bottom end of the lifting rod (12); a push-pull rod (14) is fixedly mounted on the end of the slide plate (7), and a roller (15) is mounted on one end of the push-pull rod (14), and an arc-shaped plate (16) that fits the roller (15) is fixedly mounted on the lifting rod (12).

2. The metal plate phosphating treatment hanging feeding device according to claim 1, characterized in that: A ball bearing that cooperates with the second shaft (502) is mounted on the horizontal rod (4).

3. The metal plate phosphating treatment hanging feeding device according to claim 2, characterized in that: A positioning groove (504) is provided on the top of the hook (503), and a receiving groove (505) is provided inside the first shaft (501) and the second shaft (502). A positioning pin (506) that cooperates with the positioning groove (504) is movably installed in the receiving groove (505).

4. The metal plate phosphating treatment hanging feeding device according to claim 3, characterized in that: The second shaft (502) and the gear (6) are slidably matched in the vertical direction, and an elastic member is connected between the two; a horizontal first cylindrical block (507) is installed on the positioning pin (506), and a control plate (508) is slidably mounted on both the first shaft (501) and the second shaft (502) in the horizontal direction, and a first inclined groove (509) is provided on the control plate (508) to match the first cylindrical block (507).

5. The metal plate phosphating treatment hanging feeding device according to claim 4, characterized in that: A semicircular plate (510) coaxial with the No. 2 shaft (502) is rotatably mounted on the bottom surface of the horizontal rod (4) at a position corresponding to each No. 2 shaft (502); a second cylindrical block (511) parallel to the first cylindrical block (507) is mounted on the lower surface of the semicircular plate (510) via a rigid rod; and a second inclined groove (512) cooperating with the second cylindrical block (511) is provided on the control plate (508) of the No. 2 shaft (502).

6. The metal plate phosphating treatment hanging feeding device according to claim 5, characterized in that: A second cylindrical block (511) parallel to the first cylindrical block (507) is mounted on the bottom surface of the horizontal rod (4) at a position corresponding to each No. 1 shaft (501) through a rigid rod, and a second inclined groove (512) cooperating with the second cylindrical block (511) is provided on the control plate (508) of the No. 1 shaft (501).

7. The metal plate phosphating treatment hanging feeding device according to claim 6, characterized in that: The first cylindrical block (507) is rotationally engaged with the positioning pin (506), and the second cylindrical block (511) is rotationally engaged with the rigid rod.

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