Lead ingot trimming device

Abstract

The utility model discloses a lead ingot trimming device, which relates to the technical field of lead ingot production and processing and comprises a conveying mechanism, a transverse cutting mechanism and a vertical cutting mechanism. The conveying mechanism is used for conveying lead ingots; the transverse cutting mechanism is movably arranged on a moving path of the lead ingot and comprises a first trimming piece; and the vertical cutting mechanism is movably arranged on the moving path of the lead ingot and comprises a second trimming piece. When the transverse cutting mechanism moves in the direction perpendicular to the conveying direction of the conveying mechanism, the first trimming part abuts against the edge of the lead ingot and moves so as to eliminate burrs, and when the vertical cutting mechanism moves in the direction parallel to the conveying direction of the conveying mechanism, the second trimming part abuts against the edge of the lead ingot and moves so as to eliminate burrs. According to the lead ingot trimming device, whole-process automation of lead ingot treatment is achieved, and the overall production efficiency can be improved; and through cooperation of the transverse cutting mechanism and the vertical cutting mechanism, burrs on the edge of the lead ingot can be comprehensively removed, and the surface quality and the overall attractiveness of a product are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lead ingot production and processing, in particular to a lead ingot trimming device. Background Art

[0002] In the production and processing of lead ingots, especially in the operation of automatic ingot casting machines, trimming of lead ingots is an important step. After casting, burrs often appear on the surface of the lead ingots. These burrs not only affect the appearance quality of the lead ingots, but may also have an adverse effect on subsequent processing and use, such as increasing processing difficulty and reducing product qualification rate. Traditional methods of trimming lead ingots mainly rely on manual labor, and workers need to use tools such as files to remove burrs on the surface of the lead ingots one by one. The manual deburring method is not only inefficient and labor-intensive, but also easily leads to inconsistent trimming quality due to human factors, increasing the rejection rate of products. At the same time, with the popularization of automated production lines, manual trimming has become difficult to meet the needs of efficient and stable production. Therefore, there are still shortcomings and deficiencies in the existing technology. Utility Model Content

[0003] The purpose of the utility model is to provide a lead ingot trimming device, which solves the technical problem that the current lead ingot trimming method mainly relies on manual work, which is not only inefficient and labor-intensive, but also easily leads to inconsistent trimming quality due to human factors, thereby increasing the unqualified rate of products.

[0004] To achieve the above-mentioned purpose, the utility model provides a lead ingot trimming device, comprising:

[0005] A conveying mechanism for conveying lead ingots;

[0006] A cross-cutting mechanism is movably arranged on a moving path of the lead ingot and includes a first trimming member;

[0007] A vertical cutting mechanism is movably arranged on the moving path of the lead ingot and includes a second trimming member;

[0008] When the cross-cutting mechanism moves in a direction perpendicular to the conveying direction of the conveying mechanism, the first trimming member abuts against the edge of the lead ingot and moves to eliminate burrs; when the vertical cutting mechanism moves in a direction parallel to the conveying direction of the conveying mechanism, the second trimming member abuts against the edge of the lead ingot and moves to eliminate burrs.

[0009] Preferably, the cross-cutting mechanism comprises:

[0010] a first telescopic device;

[0011] a first connecting plate, fixedly mounted on the telescopic end of the first telescopic device;

[0012] a second connecting plate;

[0013] a first guide rod and a first elastic member, wherein one end of the first guide rod is slidably connected to the first connecting plate, the other end of the first guide rod is fixedly connected to the second connecting plate, the first elastic member is sleeved on the first guide rod, and the first elastic member is located between the first connecting plate and the second connecting plate;

[0014] Wherein, the first trimming piece is arranged on a side of the second connecting plate facing away from the first connecting plate.

[0015] Preferably, it further includes a first drive motor, the first telescopic device is arranged at the output end of the first drive motor, and the first drive motor is used to output linear motion, thereby driving the cross-cutting mechanism to move in a direction perpendicular to the conveying direction of the conveying mechanism.

[0016] Preferably, the vertical cutting mechanism is divided into two groups, and the two groups of vertical cutting mechanisms are symmetrically arranged and located on both sides of the conveying mechanism.

[0017] Preferably, the vertical cutting mechanism comprises:

[0018] a second telescopic device;

[0019] a third connecting plate, fixedly mounted on the telescopic end of the second telescopic device;

[0020] a fourth connecting plate;

[0021] a second guide rod and a second elastic member, one end of the second guide rod being slidably connected to the third connecting plate, the other end of the second guide rod being fixedly connected to the fourth connecting plate, the second elastic member being sleeved on the second guide rod, and the second elastic member being located between the third connecting plate and the fourth connecting plate;

[0022] Wherein, the second trimming piece is arranged on a side of the fourth connecting plate facing away from the third connecting plate.

[0023] Preferably, it further includes a second drive motor, the second telescopic device is provided at the output end of the second drive motor, and the second drive motor is used to output linear motion, thereby driving the vertical cutting mechanism to move in a direction parallel to the conveying direction of the conveying mechanism.

[0024] Preferably, it also includes a vertical cutting positioning mechanism, which is arranged on the conveying mechanism and includes a second manipulator for clamping and fixing the lead ingot.

[0025] Preferably, it also includes an identification system, which is arranged on one side of the conveying mechanism and is used to capture and analyze image information of the lead ingot in real time, including an industrial camera.

[0026] Preferably, it also includes a correction device for adjusting the position and posture of the lead ingot until it reaches a preset position and posture after receiving the signal sent by the recognition system.

[0027] Preferably, the correction device comprises:

[0028] a third telescopic device;

[0029] a rotary driver, provided at the telescopic end of the third telescopic device;

[0030] a first manipulator, provided on the rotary driver, located on a side of the rotary driver away from the third telescopic device, and used for clamping the lead ingot;

[0031] When the third telescopic device is extended or retracted, it can drive the first manipulator to move in a vertical direction, thereby approaching or moving away from the lead ingot.

[0032] Compared with the above-mentioned background technology, the lead ingot trimming device provided by the present invention has a cross-cutting mechanism that moves in a direction perpendicular to the conveying direction of the conveying mechanism, and a first trimming piece in the cross-cutting mechanism abuts against the edge of the lead ingot. As the first trimming piece moves, burrs on the edge of the lead ingot that is perpendicular to the conveying direction of the conveying mechanism are eliminated; the vertical cutting mechanism moves in a direction parallel to the conveying direction of the conveying mechanism, and a second trimming piece in the vertical cutting mechanism abuts against the edge of the lead ingot. As the second trimming piece moves, burrs on the edge of the lead ingot that is parallel to the conveying direction of the conveying mechanism are eliminated. Through the cooperation of the cross-cutting mechanism and the vertical cutting mechanism, the burrs on the edge of the lead ingot are completely removed, thereby improving the surface quality and overall aesthetics of the product; the full automation of lead ingot processing is realized, which not only reduces the steps and time of manual operation, but also avoids delays and errors caused by human factors, thereby significantly improving overall production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0034] Figure 1 A schematic diagram of the overall structure of the lead ingot trimming device provided by an embodiment of the utility model;

[0035] Figure 2 This is a structural schematic diagram of the cross-cutting mechanism in the lead ingot trimming device provided by the present invention;

[0036] Figure 3This is a schematic structural diagram of the vertical cutting mechanism in the lead ingot trimming device provided by the present invention;

[0037] Figure 4 This is a schematic structural diagram of the deviation-correcting device in the lead ingot trimming device provided by the present invention;

[0038] Figure 5 This is a structural schematic diagram of the vertical cutting positioning mechanism in the lead ingot trimming device provided by the utility model.

[0039] Figures 1 to 5 Reference numerals in the accompanying drawings: 10, conveying mechanism; 20, cross-cutting mechanism; 21, first trimming member; 22, first telescopic device; 23, first connecting plate; 24, second connecting plate; 25, first guide rod; 26, first elastic member; 30, vertical cutting mechanism; 31, second trimming member; 32, second telescopic device; 33, third connecting plate; 34, fourth connecting plate; 35, second guide rod; 36, second elastic member; 40, identification system; 50, correction device; 51, third telescopic device; 52, rotary drive; 53, first manipulator; 60, vertical cutting positioning mechanism; 61, second manipulator; 70, lead ingot. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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.

[0041] In order to enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0042] The utility model provides a lead ingot trimming device, which realizes the full automation of lead ingot processing by integrating multiple links such as visual recognition, deviation correction, cross cutting and vertical cutting, which not only reduces the steps and time of manual operation, but also avoids delays and errors caused by human factors, thereby significantly improving overall production efficiency.

[0043] Please refer to Figure 1 The lead ingot trimming device provided by the present invention includes a conveying mechanism 10, a cross-cutting mechanism 20, and a vertical cutting mechanism 30. The conveying mechanism 10 is used to convey the lead ingot 70; the cross-cutting mechanism 20 is movably arranged on the moving path of the lead ingot 70 and includes a first trimming member 21; the vertical cutting mechanism 30 is movably arranged on the moving path of the lead ingot 70 and includes a second trimming member 31.

[0044] Among them, when the cross-cutting mechanism 20 moves in a direction perpendicular to the conveying direction of the conveying mechanism 10, the first trimming member 21 abuts against the edge of the lead ingot 70 and moves to eliminate burrs. When the vertical cutting mechanism 30 moves in a direction parallel to the conveying direction of the conveying mechanism 10, the second trimming member 31 abuts against the edge of the lead ingot 70 and moves to eliminate burrs.

[0045] During operation, the lead ingot 70 is placed on the conveying mechanism 10. As the conveying mechanism 10 works, the lead ingot 70 is conveyed forward. When the cross-cutting mechanism 20 moves in a direction perpendicular to the conveying direction of the conveying mechanism 10, the first trimming member 21 in the cross-cutting mechanism 20 abuts against the edge of the lead ingot 70. As the first trimming member 21 moves, the burrs on the edge of the lead ingot 70 perpendicular to the conveying direction of the conveying mechanism 10 are eliminated. When the vertical cutting mechanism 30 moves in a direction parallel to the conveying direction of the conveying mechanism 10, the second trimming member 31 in the vertical cutting mechanism 30 abuts against the edge of the lead ingot 70. As the second trimming member 31 moves, the burrs on the edge of the lead ingot 70 parallel to the conveying direction of the conveying mechanism 10 are eliminated, thereby fully eliminating the burrs on the edge of the lead ingot 70.

[0046] Such an arrangement realizes full automation of the processing of the lead ingot 70 , which not only reduces the steps and time of manual operation, but also avoids delays and errors caused by human factors, thereby significantly improving the overall production efficiency.

[0047] Specifically, the conveying mechanism 10 can adopt a belt conveyor or a chain conveyor to ensure that the lead ingot 70 remains stable during the conveying process. The conveying speed of the conveying mechanism 10 can be adjusted according to production requirements to achieve efficient and flexible production control. At the same time, in order to prevent the lead ingot 70 from sliding or rolling during the conveying process, when a belt conveyor is used, the surface of the conveyor belt can be covered with an anti-slip material.

[0048] Please refer to Figure 1 and Figure 2 The cross-cutting mechanism 20 is provided on one side of the conveying mechanism 10 and includes a first telescopic device 22, a first connecting plate 23, a second connecting plate 24, a first guide rod 25, and a first elastic member 26. The first connecting plate 23 is fixedly provided at the telescopic end of the first telescopic device 22; one end of the first guide rod 25 is slidably connected to the first connecting plate 23, and the other end of the first guide rod 25 is fixedly connected to the second connecting plate 24. The first elastic member 26 is sleeved on the first guide rod 25 and is located between the first connecting plate 23 and the second connecting plate 24. The first trimming member 21 is provided on the side of the second connecting plate 24 facing away from the first connecting plate 23.

[0049] With this arrangement, the first telescopic device 22 telescopes and drives the first trimming member 21 to move in the vertical direction, bringing the first trimming member 21 into contact with the lead ingot 70. As the cross-cutting mechanism 20 moves in a direction perpendicular to the conveying direction of the conveying mechanism 10, the cross-cutting mechanism 20 moves from one side of the conveying mechanism 10 to the other side of the conveying mechanism 10, thereby eliminating burrs on the edge of the lead ingot 70. When the first telescopic device 22 telescopes and drives the first trimming member 21 to move in the vertical direction, bringing the first trimming member 21 into contact with the lead ingot 70, the provision of the first guide rod 25 and the first elastic member 26 allows the first trimming member 21 to elastically contact the lead ingot 70, thereby enhancing stability and protecting the first trimming member 21.

[0050] Specifically, the first trimming member 21 can be a cutting blade or a grinding wheel. In this embodiment, the first trimming member 21 includes a cutting blade and a grinding wheel. Under the combined action of the cutting blade and the grinding wheel, the lead ingot 70 is trimmed, and the trimming effect is good. The first elastic member 26 is a compression spring.

[0051] The lead ingot trimming device provided by the present invention also includes a first drive motor. A first telescopic device 22 is provided at the output end of the first drive motor. The first drive motor is configured to output linear motion, thereby driving the cross-cutting mechanism 20 to move perpendicularly to the conveying direction of the conveying mechanism 10. To ensure cutting accuracy and efficiency, the first drive motor is a servo motor.

[0052] In order to achieve stable movement of the cross-cutting mechanism 20, the lead ingot trimming device provided by the present invention can also be provided with a first guide rail, which guides the movement of the cross-cutting mechanism 20 in a direction perpendicular to the conveying direction of the conveying mechanism 10.

[0053] Please refer to Figure 1 and Figure 3 In this embodiment, two sets of vertical cutting mechanisms 30 are provided, and the two sets of vertical cutting mechanisms 30 are symmetrically arranged on both sides of the conveying mechanism 10. By providing two sets of vertical cutting mechanisms 30, as the vertical cutting mechanisms 30 move in a direction parallel to the conveying direction of the conveying mechanism 10, burrs on the edges of the lead ingot 70 parallel to the conveying direction of the conveying mechanism 10 are eliminated.

[0054] Please refer to Figure 1 and Figure 3The vertical cutting mechanism 30 includes a second telescopic device 32, a third connecting plate 33, a fourth connecting plate 34, a second guide rod 35, and a second elastic member 36. The third connecting plate 33 is fixedly mounted on the telescopic end of the second telescopic device 32. One end of the second guide rod 35 is slidably connected to the third connecting plate 33, and the other end of the second guide rod 35 is fixedly connected to the fourth connecting plate 34. The second elastic member 36 is sleeved on the second guide rod 35 and located between the third connecting plate 33 and the fourth connecting plate 34. The second trimming member 31 is located on the side of the fourth connecting plate 34 facing away from the third connecting plate 33.

[0055] With this arrangement, the second telescopic device 32 telescopes and drives the second trimming member 31 in a vertical direction, bringing the second trimming member 31 into contact with the lead ingot 70. As the vertical cutting mechanism 30 moves parallel to the conveying direction of the conveying mechanism 10, burrs on the edge of the lead ingot 70 are eliminated. When the second telescopic device 32 telescopes and drives the second trimming member 31 in a vertical direction, bringing the second trimming member 31 into contact with the lead ingot 70, the second guide rod 35 and the second elastic member 36 ensure elastic contact between the second trimming member 31 and the lead ingot 70, thereby enhancing stability and protecting the second trimming member 31.

[0056] Specifically, the second trimming member 31 can be a cutting blade or a grinding wheel. In this embodiment, the second trimming member 31 includes a cutting blade and a grinding wheel. Under the combined action of the cutting blade and the grinding wheel, the lead ingot 70 is trimmed, and the trimming effect is good. The second elastic member 36 is a compression spring.

[0057] The lead ingot trimming device provided by the present invention also includes a second drive motor. A second telescopic device 32 is provided at the output end of the second drive motor. The second drive motor is used to output linear motion, thereby driving the vertical cutting mechanism 30 to move in a direction parallel to the conveying direction of the conveying mechanism 10. To ensure cutting accuracy and efficiency, the second drive motor is a servo motor.

[0058] In order to achieve stable movement of the vertical cutting mechanism 30, the lead ingot trimming device provided by the present invention can also be provided with a second guide rail, which guides the movement of the vertical cutting mechanism 30 in a direction parallel to the conveying direction of the conveying mechanism 10.

[0059] Please refer to Figure 1 The lead ingot trimming device provided by the present invention also includes an identification system 40. The identification system 40 is arranged on one side of the conveying mechanism 10. The identification system 40 is used to capture and analyze image information of the lead ingot 70 in real time. The identification system 40 includes an industrial camera and an image processing algorithm.

[0060] As the lead ingot 70 is conveyed by the conveyor mechanism 10, it first passes beneath the recognition system 40. As the lead ingot 70 passes beneath the recognition system 40, an industrial camera begins capturing its image. Using image processing algorithms, the recognition system 40 quickly and accurately analyzes the shape, size, surface quality, and position and posture of the lead ingot 70 relative to pre-set standards. This analysis examines whether the ingot 70's edges are straight, whether there are cracks, bubbles, or other surface defects, and whether the ingot 70 has deviated from the pre-set conveying path or posture. By capturing and analyzing the image information of the lead ingot 70 in real time, if the recognition system 40 detects that the ingot 70's condition does not meet pre-set standards, such as tilt, offset, or irregular edges, it immediately issues a signal, triggering subsequent corrective action. The recognition system 40 can adjust recognition parameters based on different production batches to improve recognition accuracy and stability.

[0061] Please refer to Figure 1 and Figure 4 The lead ingot trimming device provided by the present invention also includes a correction device 50, which is located downstream of the identification system 40. The correction device 50 is used to adjust the position and posture of the lead ingot 70 until it reaches a preset position and posture after receiving the correction signal sent by the identification system 40.

[0062] In this embodiment, the correction device 50 includes a third telescopic device 51, a rotary driver 52, and a first manipulator 53. The rotary driver 52 is provided at the telescopic end of the third telescopic device 51. The first manipulator 53 is provided on the rotary driver 52. The first manipulator 53 is located on the side of the rotary driver 52 facing away from the third telescopic device 51. The first manipulator 53 is used to clamp the lead ingot 70.

[0063] When the third telescopic device 51 is extended or retracted, it can drive the first manipulator 53 to move in the vertical direction, thereby approaching or moving away from the lead ingot 70 .

[0064] The correction device 50 can accurately grip a specific portion of the lead ingot 70. Upon receiving a correction signal from the identification system 40, the correction device 50 responds quickly. As the third telescopic device 51 expands and contracts, the first manipulator 53 grips the lead ingot 70. The rotary actuator 52, based on the deviation data provided by the identification system 40, outputs a rotational motion to rotate the lead ingot 70 about its central axis, fine-tuning the angle and position of the lead ingot 70 until it reaches the preset posture and position. During the correction process, once the lead ingot 70 reaches the correct posture and position, the correction device 50 immediately stops and releases the lead ingot 70, allowing it to continue moving along the conveyor mechanism 10.

[0065] After the deviation correction, the lead ingot 70 continues to be transported forward. After reaching the working area of the cross-cutting mechanism 20, the cross-cutting mechanism 20 removes the burrs on the edge of the lead ingot 70. After completing the cross-cutting and deburring operation, the lead ingot 70 continues to move forward until it reaches the working area of the vertical cutting mechanism 30. The vertical cutting mechanism 30 accurately cuts the side of the lead ingot 70.

[0066] Please refer to Figure 1 and Figure 5 The lead ingot trimming device provided by the present invention also includes a vertical cutting positioning mechanism 60, which is disposed on the conveying mechanism 10 and includes a second manipulator 61 for clamping and fixing the lead ingot 70. When the vertical cutting mechanism 30 trims the lead ingot 70, the second manipulator 61 first clamps and fixes the lead ingot 70. The second manipulator 61 clamps the middle of the lead ingot 70, and the vertical cutting mechanisms 30 are located on both sides of the lead ingot 70. As the vertical cutting mechanism 30 moves in a direction parallel to the conveying direction of the conveying mechanism 10, the second trimming member 31 contacts the lead ingot 70, thereby eliminating burrs on the edge of the lead ingot 70.

[0067] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0068] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. A lead ingot trimming device, characterized in that: include: A conveying mechanism for conveying lead ingots; A cross-cutting mechanism is movably arranged on a moving path of the lead ingot and includes a first trimming member; A vertical cutting mechanism is movably arranged on the moving path of the lead ingot and includes a second trimming member; When the cross-cutting mechanism moves in a direction perpendicular to the conveying direction of the conveying mechanism, the first trimming member abuts against the edge of the lead ingot and moves to eliminate burrs; when the vertical cutting mechanism moves in a direction parallel to the conveying direction of the conveying mechanism, the second trimming member abuts against the edge of the lead ingot and moves to eliminate burrs.

2. The lead ingot trimming device according to claim 1, characterized in that: The cross-cutting mechanism comprises: a first telescopic device; a first connecting plate, fixedly mounted on the telescopic end of the first telescopic device; a second connecting plate; a first guide rod and a first elastic member, wherein one end of the first guide rod is slidably connected to the first connecting plate, the other end of the first guide rod is fixedly connected to the second connecting plate, the first elastic member is sleeved on the first guide rod, and the first elastic member is located between the first connecting plate and the second connecting plate; Wherein, the first trimming piece is arranged on a side of the second connecting plate facing away from the first connecting plate.

3. The lead ingot trimming device according to claim 2, characterized in that: It also includes a first drive motor, the first telescopic device is arranged at the output end of the first drive motor, and the first drive motor is used to output linear motion, thereby driving the cross-cutting mechanism to move in a direction perpendicular to the conveying direction of the conveying mechanism.

4. The lead ingot trimming device according to claim 1, characterized in that: There are two groups of vertical cutting mechanisms, which are symmetrically arranged and located on both sides of the conveying mechanism.

5. The lead ingot trimming device according to claim 4, characterized in that: The vertical cutting mechanism comprises: a second telescopic device; a third connecting plate, fixedly mounted on the telescopic end of the second telescopic device; a fourth connecting plate; a second guide rod and a second elastic member, one end of the second guide rod being slidably connected to the third connecting plate, the other end of the second guide rod being fixedly connected to the fourth connecting plate, the second elastic member being sleeved on the second guide rod, and the second elastic member being located between the third connecting plate and the fourth connecting plate; Wherein, the second trimming piece is arranged on a side of the fourth connecting plate facing away from the third connecting plate.

6. The lead ingot trimming device according to claim 5, characterized in that: It also includes a second drive motor, the second telescopic device is arranged at the output end of the second drive motor, and the second drive motor is used to output linear motion, thereby driving the vertical cutting mechanism to move in a direction parallel to the conveying direction of the conveying mechanism.

7. The lead ingot trimming device according to claim 4, characterized in that: It also includes a vertical cutting positioning mechanism, which is arranged on the conveying mechanism and includes a second manipulator for clamping and fixing the lead ingot.

8. The lead ingot trimming device according to any one of claims 1 to 7, characterized in that: It also includes an identification system, which is arranged on one side of the conveying mechanism and is used to capture and analyze image information of the lead ingots in real time, including an industrial camera.

9. The lead ingot trimming device according to claim 8, characterized in that: It also includes a correction device for adjusting the position and posture of the lead ingot until it reaches a preset position and posture after receiving a signal from the recognition system.

10. The lead ingot trimming device according to claim 9, characterized in that: The deviation correcting device comprises: a third telescopic device; a rotary driver, provided at the telescopic end of the third telescopic device; a first manipulator, provided on the rotary driver, located on a side of the rotary driver away from the third telescopic device, and used for clamping the lead ingot; When the third telescopic device is extended or retracted, it can drive the first manipulator to move in a vertical direction, thereby approaching or moving away from the lead ingot.

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