Metering pump for filling silver additive for electroplating

Abstract

The utility model relates to the field of electroplating discloses a kind of metering pump for silver additive filling for electroplating, including pump body power component, pump body overflow component and diaphragm installation pipe, the housing of pump body power component is fixedly connected diaphragm installation pipe, the output shaft of pump body power component and diaphragm are in diaphragm installation pipe, the installation pipe of one end of diaphragm installation pipe deviating from pump body power component is connected with the installation pipe of pump body overflow component, further including four L-shaped clamping strips one set on the outer cylindrical surface of the opening end of diaphragm installation pipe, four L-shaped clamping strips two set on the outer cylindrical surface of the installation pipe of pump body overflow component, sliding clamping block structure set on the diaphragm installation pipe, fixed ring set on the diaphragm installation pipe, plug-in limiting structure set on the fixed ring, adopt plug and slot cooperation positioning, L-shaped clamping strip and arc strip quick clamping fixed, replace the thread of easy corrosion and the flange connection of complicated, not only realize the quick disassembly of pump body overflow component and power component.

Description

Technical Field

[0001] This utility model relates to the field of electroplating, specifically to a metering pump for filling silver additives for electroplating. Background Technology

[0002] In the electroplating industry, silver additives are key materials for improving the quality of electroplated layers. Their filling accuracy and efficiency directly affect the performance and quality of electroplated products. As the core equipment for filling silver additives, metering pumps are required to have characteristics such as high-precision metering, strong corrosion resistance, and convenient maintenance.

[0003] The connection structure between the pump body flow parts and the power parts of existing metering pumps mostly adopts traditional threaded or flanged connections. Threaded connections are susceptible to corrosion from the acid and alkali components in the electroplating silver additives, which can lead to stripped threads or seizing. Disassembly requires a lot of manpower and time and may even damage pump body components. Although flange connections have better sealing performance, they require multiple bolts for fastening, and the installation and disassembly process is cumbersome and not conducive to quick inspection and maintenance. Therefore, we propose a metering pump for filling electroplating silver additives. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a metering pump for filling silver additives for electroplating, which solves the aforementioned problems.

[0005] To achieve the above-mentioned objectives, this utility model provides the following technical solution: a metering pump for filling silver additives for electroplating, comprising a pump body power component, a pump body flow component, and a diaphragm mounting tube. The diaphragm mounting tube is fixedly connected to the outer shell of the pump body power component. The output shaft of the pump body power component and the diaphragm are located inside the diaphragm mounting tube. One end of the diaphragm mounting tube facing away from the pump body power component is connected to the mounting tube of the pump body flow component. The pump body power component also includes:

[0006] Four L-shaped retaining strips are provided on the outer cylindrical surface of the opening end of the diaphragm mounting tube, and the four L-shaped retaining strips are evenly distributed along the circumference of the diaphragm mounting tube.

[0007] The L-shaped clip is an incompletely annular structure with an L-shaped cross-section. One end of the L-shaped clip is fixedly connected to the diaphragm mounting tube, and the other end of the L-shaped clip faces the pump body power component.

[0008] Four L-shaped retaining strips are provided on the outer cylindrical surface of the mounting pipe of the pump body flow passage component. The four L-shaped retaining strips are evenly distributed along the circumference of the mounting pipe of the pump body flow passage component.

[0009] The second L-shaped clip is an incompletely annular structure with an L-shaped cross-section. One end of the second L-shaped clip is fixedly connected to the pump body flow component, and the other end of the second L-shaped clip is away from the diaphragm mounting tube. The second L-shaped clip corresponds to the first L-shaped clip.

[0010] The sliding block structure is provided on the diaphragm mounting tube, and the sliding block structure corresponds to the L-shaped clip one and the L-shaped clip two.

[0011] A fixing ring is provided on the diaphragm mounting tube, the inner ring surface of the fixing ring is fixedly connected to the diaphragm mounting tube, and the fixing ring is located between the pump body power component and the sliding block structure.

[0012] The insertion limiting structure is provided on the fixed ring, and the insertion limiting structure corresponds to the sliding block structure.

[0013] Preferably, the end of the diaphragm mounting tube opposite to the pump body power component has multiple slots evenly distributed along the circumference of the diaphragm mounting tube.

[0014] Preferably, a plurality of inserts are fixedly connected to the open end of the mounting pipe of the pump body flow component, which are evenly distributed along the circumference of the mounting pipe. The number and distribution position of the inserts are consistent with the slots, and the inserts are inserted into the corresponding slots.

[0015] Preferably, the sliding block structure includes a locking tube, an arc-shaped strip, and a C-shaped locking strip. Four arc-shaped strips are connected to the inner cylindrical surface of the locking tube and are evenly distributed along the circumference of the locking tube. The arc-shaped strips are incomplete annular structures with a C-shaped cross-section. The outer annular surface of the arc-shaped strips is fixedly connected to the locking tube. The arc-shaped strips correspond to the L-shaped locking strip one and the L-shaped locking strip two. Four C-shaped locking strips are fixedly connected to the open end of the arc-shaped strips and are evenly distributed along the circumference of the locking tube. The C-shaped locking strips correspond to the arc-shaped strips.

[0016] Preferably, the locking tube has a through-hole on the side opposite to the opening, the locking tube is sleeved on the diaphragm mounting tube, and the arc-shaped strip is snapped onto the outside of the L-shaped clip one and L-shaped clip two.

[0017] Preferably, the side of the fixing ring opposite to the locking tube has a plurality of limiting holes evenly distributed along the circumference of the fixing ring.

[0018] Preferably, the insertion limiting structure includes a limiting ring and limiting rods. Multiple limiting rods are fixedly connected to the limiting ring and are evenly distributed along the circumference of the limiting ring. The number and position of the limiting rods correspond to the limiting holes. The limiting rods are inserted into the limiting holes of the fixed ring. The limiting ring is located between the fixed ring and the pump body power component. The end of the limiting rod facing away from the limiting ring faces the locking tube.

[0019] Preferably, the side of the locking tube opposite to the arc-shaped strip has multiple limiting holes evenly distributed along the circumference of the locking tube, and the end of the limiting rod opposite to the limiting ring is inserted into the corresponding limiting hole of the locking tube.

[0020] Compared with the prior art, this utility model provides a metering pump for filling silver additives for electroplating, which has the following beneficial effects:

[0021] This metering pump for filling silver additives in electroplating uses a combination of inserts and slots for positioning, and L-shaped and arc-shaped clips for quick snap-fit ​​fixing, replacing easily corroded threads and cumbersome flange connections. This not only enables rapid disassembly and assembly of the pump body's flow components and power components, significantly shortening maintenance time, but also enhances sealing performance, preventing silver additive leakage. At the same time, the plug-in limiting structure further ensures connection stability, effectively reducing metering deviations caused by component loosening, significantly improving filling accuracy and equipment lifespan, and meeting the stringent requirements of the electroplating industry for high precision, corrosion resistance, and convenient maintenance. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is an exploded view of the structure of this utility model;

[0024] Figure 3 This is a cross-sectional view of the sliding block structure of this utility model;

[0025] Figure 4 for Figure 3 A magnified view of part A in the diagram;

[0026] Figure 5 This is a cross-sectional view of the insertion and limiting structure of this utility model;

[0027] Figure 6 for Figure 5 A magnified view of part B in the diagram.

[0028] In the diagram: 1. Pump body power component; 2. Pump body flow component; 3. Diaphragm mounting pipe; 4. Fixing ring; 5. Limiting ring; 6. Limiting rod; 7. Locking pipe; 8. L-shaped retaining strip one; 9. Slot; 10. C-shaped retaining strip; 11. Arc strip; 12. Mounting hole; 13. Insert block; 14. Limiting hole; 15. L-shaped retaining strip two. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Please see Figure 1-6A metering pump for filling silver additives for electroplating includes a pump body power component 1, a pump body flow component 2, and a diaphragm mounting tube 3. The diaphragm mounting tube 3 is fixedly connected to the outer shell of the pump body power component 1. The output shaft of the pump body power component 1 and the diaphragm are inside the diaphragm mounting tube 3. One end of the diaphragm mounting tube 3 facing away from the pump body power component 1 is connected to the mounting tube of the pump body flow component 2. The pump body power component 1 also includes:

[0031] Four L-shaped retaining strips 8 are set on the outer cylindrical surface of the opening end of the diaphragm installation tube 3, and the four L-shaped retaining strips 8 are evenly distributed along the circumference of the diaphragm installation tube 3.

[0032] L-shaped clip 8 is an incompletely annular structure with an L-shaped cross-section. One end of L-shaped clip 8 is fixedly connected to diaphragm mounting tube 3, and the other end of L-shaped clip 8 faces the pump body power component 1.

[0033] Four L-shaped retaining strips 215 are set on the outer cylindrical surface of the mounting pipe of the pump body flow-through component 2. The four L-shaped retaining strips 215 are evenly distributed along the circumference of the mounting pipe of the pump body flow-through component 2.

[0034] L-shaped clip 2 15 is an incompletely annular structure with an L-shaped cross-section. One end of L-shaped clip 2 15 is fixedly connected to the pump body flow part 2, and the other end of L-shaped clip 2 15 is away from the diaphragm mounting pipe 3. L-shaped clip 2 15 corresponds to L-shaped clip 1 8.

[0035] The sliding block structure is provided on the diaphragm installation tube 3, and the sliding block structure corresponds to L-shaped clip 8 and L-shaped clip 15;

[0036] The fixing ring 4 is set on the diaphragm mounting tube 3. The inner ring surface of the fixing ring 4 is fixedly connected to the diaphragm mounting tube 3. The fixing ring 4 is located between the pump body power component 1 and the sliding block structure.

[0037] The insertion limiting structure is set on the fixed ring 4, and the insertion limiting structure corresponds to the sliding block structure.

[0038] Furthermore, the end of the diaphragm mounting tube 3 facing away from the pump body power component 1 is provided with a plurality of slots 9 evenly distributed along the circumference of the diaphragm mounting tube 3, and the slots 9 are used for positioning with the pump body flow component 2.

[0039] Furthermore, multiple insert blocks 13 are fixedly connected to the open end of the mounting pipe of the pump body flow component 2, which are evenly distributed along the circumference of the mounting pipe of the pump body flow component 2. The number and distribution position of the insert blocks 13 are consistent with the slots 9. The insert blocks 13 are inserted into the corresponding slots 9. The insert blocks 13 and the slots 9 are used to position the pump body flow component 2 and the diaphragm mounting pipe 3, so that the L-shaped retaining strip 15 of the pump body flow component 2 and the L-shaped retaining strip 8 of the diaphragm mounting pipe 3 are aligned.

[0040] Furthermore, the sliding block structure includes a locking tube 7, an arc-shaped strip 11, and a C-shaped locking strip 10. Four arc-shaped strips 11 are evenly distributed along the circumference of the locking tube 7 connected to the inner cylindrical surface of the locking tube 7. The arc-shaped strip 11 is an incomplete annular structure with a C-shaped cross-section. The outer annular surface of the arc-shaped strip 11 is fixedly connected to the locking tube 7. The arc-shaped strip 11 corresponds to the L-shaped locking strip 18 and the L-shaped locking strip 2 15. Four C-shaped locking strips 10 are fixedly connected to the open end of the arc-shaped strip 11, which correspond to the arc-shaped strip 11. The locking tube 7 is used to install the C-shaped locking strip 10 and the arc-shaped strip 11. The arc-shaped strip 11 is used to fix the L-shaped locking strip 18 and the L-shaped locking strip 2 15.

[0041] Furthermore, the locking tube 7 has a through-hole 12 on the opposite side of its opening. The locking tube 7 is sleeved on the diaphragm mounting tube 3. The arc-shaped strip 11 is snapped onto the outside of the L-shaped clip 8 and the L-shaped clip 2 15. The mounting hole 12 is used to install the locking tube 7 on the diaphragm mounting tube 3. The locking tube 7 slides on the diaphragm mounting tube 3. The C-shaped clip 10 corresponds to the arc-shaped strip 11. When the pump body flow component 2 is connected to the diaphragm mounting tube 3, the gap between the C-shaped clip 10 and the L-shaped clip 8 and the L-shaped clip 2 15 is aligned. The arc-shaped strip 11 is slid to the position of the L-shaped clip 8 and the L-shaped clip 2 15. The locking tube 7 is rotated to snap the arc-shaped strip 11 onto the outside of the L-shaped clip 8 and the L-shaped clip 2 15.

[0042] Furthermore, the side of the fixing ring 4 opposite to the locking tube 7 is provided with a plurality of limiting holes 14 evenly distributed along the circumference of the fixing ring 4. The limiting holes 14 are used to install the insertion limiting structure.

[0043] Furthermore, the insertion limiting structure includes a limiting ring 5 and limiting rods 6. Multiple limiting rods 6 are fixedly connected to the limiting ring 5 and are evenly distributed along the circumference of the limiting ring 5. The number and position of the limiting rods 6 correspond to the limiting holes 14. The limiting rods 6 are inserted into the limiting holes 14 of the fixed ring 4. The limiting ring 5 is located between the fixed ring 4 and the pump body power component 1. The end of the limiting rod 6 facing away from the limiting ring 5 faces the locking tube 7. The limiting ring 5 is used to install the limiting rods 6, and the limiting rods 6 slide within the limiting holes 14 of the fixed ring 4.

[0044] Furthermore, the side of the locking tube 7 facing away from the arc-shaped strip 11 is provided with multiple limiting holes 14 evenly distributed along the circumference of the locking tube 7. The end of the limiting rod 6 facing away from the limiting ring 5 is inserted into the corresponding limiting hole 14 of the locking tube 7. The limiting rod 6 is inserted into the limiting hole 14 of the locking tube 7 through the fixing ring 4 to prevent the locking tube 7 from sliding with the diaphragm mounting tube 3 and to prevent the arc-shaped strip 11 from separating from the L-shaped clip 1 8 and L-shaped clip 2 15.

[0045] Structural Description:

[0046] Pump body power component 1: a housing structure containing a motor and drive components, providing power, whose output shaft drives the diaphragm to move and drive the metering pump to work;

[0047] Pump body flow component 2: a cavity structure including an installation pipe. The opening end of the installation pipe is provided with a plug 13 and an L-shaped retainer 15 to accommodate the electroplated silver additive. The medium is drawn in and discharged through the inlet and outlet to complete the filling operation.

[0048] Diaphragm mounting tube 3: One end is connected to the outer shell of the pump body power component 1, and the other end is provided with a slot 9 and an L-shaped retaining strip 8. It is a tubular structure that accommodates the diaphragm and the output shaft of the pump body power component 1, provides installation space, and realizes the positioning and connection with the pump body flow component 2 through the slot and retaining strip.

[0049] Fixed ring 4: An annular structure that fixes the inner ring surface to the diaphragm mounting tube 3, installs a plug-in limiting structure, limits the sliding range of the sliding block structure, and assists in fixing the locking tube 7;

[0050] Limiting ring 5: A ring structure connecting multiple limiting rods 6, supporting the limiting rods 6, and working with the fixing ring 4 and locking tube 7 to prevent the locking tube 7 from sliding and ensure the stability of the connection structure;

[0051] Limiting rod 6: A rod-shaped structure that passes through the limiting hole 14 of the fixing ring 4 and the locking tube 7 to restrict the movement of the locking tube 7 and fix the sliding block structure;

[0052] Locking tube 7: A tubular structure with an arc-shaped strip 11 on the inner wall and mounting holes 12 and limiting holes 14 on the side wall. The arc-shaped strip 11 and C-shaped clip 10 are installed, and the L-shaped clip 1 8 and L-shaped clip 2 15 are locked and fixed by sliding and rotating.

[0053] L-shaped clip 18: an incompletely annular structure with an L-shaped cross-section, one end of which is fixed to the diaphragm mounting tube 3. It cooperates with L-shaped clip 215 and is connected to the pump body flow part 2 and the diaphragm mounting tube 3 by the arc strip 11.

[0054] Slot 9: A groove evenly distributed around the circumference at the end of the diaphragm mounting tube 3, which cooperates with the insert block 13 of the pump body flow part 2 to achieve rapid positioning of the two.

[0055] C-shaped clip 10: An incompletely annular structure with a C-shaped cross-section, fixed to the open end of the arc-shaped clip 11, assisting in the positioning of the arc-shaped clip 11, and facilitating alignment with L-shaped clip 18 and L-shaped clip 2 15;

[0056] Arc strip 11: A partially annular structure with a C-shaped cross-section, the outer ring surface is fixed to the locking tube 7, and it snaps together L-shaped clip 1 8 and L-shaped clip 2 15 to fix the pump body flow part 2 and the diaphragm mounting tube 3.

[0057] Mounting hole 12: A through hole through the locking tube 7, used to install the locking tube 7 so that it can slide on the diaphragm mounting tube 3;

[0058] Insert 13: A block-shaped structure fixed to the opening end of the pump body flow component 2 mounting pipe, which is inserted into the slot 9 of the diaphragm mounting pipe 3 to achieve precise positioning of the pump body flow component 2 and the diaphragm mounting pipe 3.

[0059] Limiting hole 14: Through the fixing ring 4 and the locking tube 7, the through holes are evenly distributed along the circumference, allowing the limiting rod 6 to be inserted, restricting the sliding of the locking tube 7, and fixing the connection structure;

[0060] L-shaped clip 215: An incompletely annular structure with an L-shaped cross-section, one end of which is fixed to the pump body flow part 2 mounting pipe, corresponding to L-shaped clip 18, and is snapped together by arc-shaped strip 11 to achieve a stable connection of pump body components.

[0061] Working principle: When installing the pump body flow-through component 2 and the diaphragm mounting pipe 3, firstly, insert the plug 13 at the open end of the pump body flow-through component 2's mounting pipe into the slot 9 at the end of the diaphragm mounting pipe 3 facing away from the pump body power component 1. Since the number and distribution of the plugs 13 are consistent with the slot 9, this insertion process can quickly and accurately complete the positioning of the pump body flow-through component 2 and the diaphragm mounting pipe 3. At the same time, it aligns the L-shaped retaining strip 15 of the pump body flow-through component 2 and the L-shaped retaining strip 8 of the diaphragm mounting pipe 3, laying the foundation for subsequent connection and fixation. After the pump body flow-through component 2 and the diaphragm mounting pipe 3 are positioned... The connection and fixing operation begins by aligning the C-shaped locking strip 10 in the sliding locking block structure with the gaps between the L-shaped locking strip 18 and L-shaped locking strip 25. At this point, the arc-shaped strip 11 is not engaged. Next, the locking tube 7 is slid along the diaphragm mounting tube 3, causing the arc-shaped strip 11 to slide to the position of the L-shaped locking strip 18 and L-shaped locking strip 25. Then, the locking tube 7 is rotated, and the arc-shaped strip 11 engages with the outside of the L-shaped locking strip 18 and L-shaped locking strip 25. In this way, the pump body flow component 2 is firmly connected to the diaphragm mounting tube 3. To prevent slippage between the locking tube 7 and the diaphragm mounting tube 3, [further steps are taken]. The arc-shaped strip 11 is separated from the L-shaped retaining strip 18 and L-shaped retaining strip 2 15. The retaining rod 6 in the insertion limiting structure is passed through the limiting hole 14 of the fixing ring 4 and inserted into the corresponding limiting hole 14 of the locking tube 7. The limiting ring 5 serves to install and support the retaining rod 6. The retaining rod 6 slides and adjusts within the limiting hole 14 to ensure that the locking tube 7 is fixed in position, thereby ensuring the stability and sealing of the entire connection structure. After the pump body power component 1 is started, its output shaft begins to rotate. The output shaft drives the diaphragm to move within the diaphragm mounting tube 3. The diaphragm reciprocates under the drive of the output shaft. When the diaphragm moves towards the pump body... When the force component 1 moves in the direction of the pump body, a negative pressure is formed in the pump body flow-through component 2. Under the action of the pressure difference, the electroplating silver additive enters the pump cavity through the inlet of the pump body flow-through component 2. When the diaphragm moves away from the direction of the pump body force component 1, the pressure in the pump cavity increases, squeezing the silver additive out from the outlet of the pump body flow-through component 2, thus achieving quantitative filling. During this process, the diaphragm mounting tube 3, the pump body flow-through component 2, the sliding block structure, and the plug-in limiting structure work together to ensure the sealing and structural stability of the pump body, prevent the silver additive from leaking, and ensure that the metering pump can complete the filling of electroplating silver additive with high precision and stability.

[0062] 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. A metering pump for filling silver additives for electroplating, comprising a pump body power component (1), a pump body flow component (2), and a diaphragm mounting tube (3), wherein the diaphragm mounting tube (3) is fixedly connected to the outer shell of the pump body power component (1), the output shaft of the pump body power component (1) and the diaphragm are located inside the diaphragm mounting tube (3), and one end of the diaphragm mounting tube (3) facing away from the pump body power component (1) is connected to the mounting tube of the pump body flow component (2), characterized in that, Also includes: Four L-shaped clips (8) are set on the outer cylindrical surface of the opening end of the diaphragm mounting tube (3), and the four L-shaped clips (8) are evenly distributed along the circumference of the diaphragm mounting tube (3). The L-shaped clip (8) is an incompletely annular structure with an L-shaped cross-section. One end of the L-shaped clip (8) is fixedly connected to the diaphragm mounting tube (3), and the other end of the L-shaped clip (8) faces the pump body power component (1). Four L-shaped clips (15) are set on the outer cylindrical surface of the mounting pipe of the pump body flow-through component (2). The four L-shaped clips (15) are evenly distributed along the circumference of the mounting pipe of the pump body flow-through component (2). The second L-shaped clip (15) is an incomplete annular structure with an L-shaped cross-section. One end of the second L-shaped clip (15) is fixedly connected to the pump body flow part (2), and the other end of the second L-shaped clip (15) is away from the diaphragm mounting tube (3). The second L-shaped clip (15) corresponds to the first L-shaped clip (8). The sliding block structure is provided on the diaphragm installation tube (3), and the sliding block structure corresponds to the L-shaped clip one (8) and L-shaped clip two (15); The fixing ring (4) is set on the diaphragm mounting tube (3), and the inner ring surface of the fixing ring (4) is fixedly connected to the diaphragm mounting tube (3). The fixing ring (4) is between the pump body power component (1) and the sliding block structure. The insertion limiting structure is provided on the fixed ring (4), and the insertion limiting structure corresponds to the sliding block structure.

2. The metering pump for filling silver additives for electroplating according to claim 1, characterized in that, The diaphragm mounting tube (3) has multiple slots (9) evenly distributed along the circumference of the diaphragm mounting tube (3) at one end away from the pump body power component (1).

3. The metering pump for filling silver additives for electroplating according to claim 2, characterized in that, Multiple inserts (13) are fixedly connected to the open end of the mounting pipe of the pump body flow component (2), which are evenly distributed along the circumference of the mounting pipe of the pump body flow component (2). The number and distribution position of the inserts (13) are consistent with the slot (9), and the inserts (13) are inserted into the corresponding slot (9).

4. The metering pump for filling silver additives for electroplating according to claim 1, characterized in that, The sliding block structure includes a locking tube (7), an arc strip (11), and a C-shaped locking strip (10). Four arc strips (11) are evenly distributed around the circumference of the locking tube (7) on the inner cylindrical surface of the locking tube (7). The arc strip (11) is an incomplete ring structure with a C-shaped cross-section. The outer ring surface of the arc strip (11) is fixedly connected to the locking tube (7). The arc strip (11) corresponds to the L-shaped locking strip one (8) and the L-shaped locking strip two (15). Four C-shaped locking strips (10) are evenly distributed around the circumference of the locking tube (7) and are fixedly connected to the open end of the arc strip (11). The C-shaped locking strips (10) correspond to the arc strips (11).

5. A metering pump for filling silver additives for electroplating according to claim 4, characterized in that, The locking tube (7) has an installation hole (12) through the side opposite to the opening. The locking tube (7) is sleeved on the diaphragm installation tube (3), and the arc strip (11) is snapped onto the outside of the L-shaped clip one (8) and L-shaped clip two (15).

6. A metering pump for filling silver additives for electroplating according to claim 4, characterized in that, The fixed ring (4) has multiple limiting holes (14) evenly distributed along the circumference of the fixed ring (4) on the side opposite to the locking tube (7).

7. A metering pump for filling silver additives for electroplating according to claim 6, characterized in that, The insertion limiting structure includes a limiting ring (5) and a limiting rod (6). Multiple limiting rods (6) are fixedly connected to the limiting ring (5) and are evenly distributed around the circumference of the limiting ring (5). The number and position of the limiting rods (6) correspond to the limiting hole (14). The limiting rods (6) are inserted into the limiting hole (14) of the fixed ring (4). The limiting ring (5) is between the fixed ring (4) and the pump body power component (1). The end of the limiting rod (6) facing away from the limiting ring (5) is towards the locking tube (7).

8. A metering pump for filling silver additives for electroplating according to claim 7, characterized in that, The locking tube (7) has multiple limiting holes (14) evenly distributed along the circumference of the locking tube (7) on the side facing away from the arc strip (11). The end of the limiting rod (6) facing away from the limiting ring (5) is inserted into the corresponding limiting hole (14) of the locking tube (7).

Images