Annealing assembly line for stretching cup body

Abstract

The utility model relates to the technical field of vacuum cup production, in particular to an annealing assembly line for stretching a cup body, which comprises a cleaning mechanism, an annealing mechanism and a control mechanism, the annealing mechanism is used for carrying out annealing treatment on the cup body and comprises a supporting frame serving as a main support of the annealing mechanism; a vertical plate is fixedly arranged at the top of the bottom plate 22, a top plate is fixedly arranged at the top of the vertical plate, so that the bottom plate 22, the vertical plate and the top plate jointly define a furnace bin with two open ends, one end of the furnace bin is a feeding end, the other end of the furnace bin is a discharging end, and the feeding end is adjacent to the cleaning mechanism; the conveying mechanism is integrated in the annealing mechanism and used for conveying cup bodies in the annealing mechanism to achieve a complete annealing process, the conveying mechanism comprises a plurality of moving plates, each moving plate is provided with at least four sets of clamping assemblies, and the clamping assemblies are used for fixing the cup bodies; the rotating assembly is used for driving the clamping assembly to rotate; and the pushing assembly is used for pushing the moving plate.

Description

Technical Field

[0001] This utility model relates to the field of thermos cup production technology, and in particular to an annealing production line for stretching cup bodies. Background Technology

[0002] In the manufacturing process of metal cups (such as stainless steel and aluminum cups), the stretched cups often have internal stress, which affects their mechanical properties and dimensional stability. To eliminate internal stress and improve material properties, the cups are usually annealed. Traditional annealing equipment relies heavily on manual operation, such as manual clamping, handling, heating, and cooling, which is inefficient and labor-intensive. Furthermore, it is often used in a complete production line, so if a failure occurs in any part of the process, the entire line must be shut down for repair, which seriously affects production efficiency.

[0003] To address this issue, this utility model proposes an annealing production line for stretching cup bodies. Utility Model Content

[0004] The purpose of this invention is to at least solve one of the aforementioned technical defects.

[0005] Therefore, one objective of this utility model is to propose an annealing production line for stretching cups, so as to solve the problems mentioned in the background art and overcome the shortcomings of the prior art.

[0006] To achieve the above objectives, one embodiment of this utility model provides an annealing production line for a stretched cup body, comprising: a cleaning mechanism for cleaning the cup body; an annealing mechanism for annealing the cup body, comprising: a support frame as the main support for the annealing mechanism; a base plate with a vertical plate fixedly mounted on top, and a top plate fixedly mounted on top of the vertical plate, such that the base plate, vertical plate, and top plate together form a furnace chamber open at both ends, one end being a feeding end and the other end being a discharging end, the feeding end being adjacent to the cleaning mechanism; and a conveying mechanism integrated into the annealing mechanism for conveying... The cup body is conveyed in the annealing mechanism to realize the complete annealing process, including: several moving plates, each of which is equipped with at least four sets of clamping components for fixing the cup body; a rotating component for driving the clamping components to rotate; a pushing component for pushing the moving plates; and two sets of transport robots, one set located between the feeding end and the cleaning mechanism for transporting the cleaned cup body to the conveying mechanism, and the other set located at the discharging end for removing the cup body from the conveying mechanism. The transport robot is equipped with a vacuum suction cup for gripping the cup body.

[0007] Preferably, the annealing mechanism further includes: a sealing component, comprising two sets symmetrically distributed at both ends of the furnace chamber, for closing the open ends of the furnace chamber to form a closed furnace chamber; a heating component for heating a local area within the furnace chamber, for heating the cup body; and a filling component for filling the furnace chamber with inert gas and simultaneously cooling the cup body.

[0008] Preferably, in any of the above embodiments, the enclosure assembly includes: a first motor, fixedly mounted on the top plate; a first guide rail, fixedly mounted on the bottom plate and located at the open end of the furnace chamber, with a closing plate slidably disposed within the first guide rail; a first rack, fixedly connected to the closing plate; and a first gear, meshing with the first rack, with the first gear fixedly mounted at the output end of the first motor.

[0009] Preferably, in any of the above embodiments, the heating assembly includes: an electric push rod disposed on the top plate with its output shaft extending through the top plate to the furnace chamber; a fixed plate fixedly connected to the output shaft of the electric push rod, a guide rod fixedly disposed on the fixed plate, the guide rod slidingly engaging with the top plate, and a vertical block fixedly disposed at the bottom of the fixed plate; a screw threadedly connected to a threaded hole in the vertical block; an adjusting frame slidingly engaging with the fixed plate, one end of the adjusting frame being rotatably connected to the screw; and an electrically heated copper tube fixedly mounted on the adjusting frame.

[0010] Preferably, according to any of the above schemes, the filling assembly includes: a first connecting pipe having a first air inlet and two first air outlets; a second connecting pipe having a second air inlet and three second air outlets, the second air outlets extending through the top plate into the furnace chamber; both the first air inlet and the second air inlet are connected to an inert gas source.

[0011] Preferably, in any of the above embodiments, the clamping assembly includes: a bushing, fixedly mounted on the top of the movable plate and communicating with a through hole in the movable plate; a transmission rod, rotatably engaged with the bushing, with a magnetic block fixedly mounted at its bottom and a disc fixedly mounted at its top, the disc having four circumferentially distributed sliding grooves; a first lead screw, fixedly mounted on the disc; four sliding plates, slidably mounted in the four sliding grooves, each sliding plate having a tensioning component fixedly mounted thereon, the tensioning component being a ceramic component; and a sliding block, threadedly connected to the first lead screw, the sliding block having a connecting rod rotatably mounted thereon. The other end of the connecting rod is rotatably connected to the sliding plate; the rotating assembly includes: a concave plate, fixedly disposed at the bottom of the base plate; a fourth motor, fixedly connected to the concave plate and having its output shaft passing through the concave plate, with a third synchronous pulley fixedly disposed on the output shaft of the fourth motor; a positioning sleeve, fixedly connected to the bottom of the base plate; a cylindrical rod, rotatably connected to the positioning sleeve and extending through the base plate to the furnace chamber, with a fourth synchronous pulley fixedly disposed at the bottom of the cylindrical rod, the fourth synchronous pulley being linked with the third synchronous pulley via a second transmission belt, and an electromagnetic block cooperating with a magnetic block being fixedly disposed at the top of the cylindrical rod.

[0012] Preferably, in any of the above embodiments, the pushing components are provided in at least two sets and symmetrically distributed at both ends of the furnace chamber. Each set of the pushing components includes: a positioning plate, fixedly connected to the support frame, on which a second rack and a second guide rail are mounted; a sliding frame, on which a slider is fixedly mounted, the slider slidingly engaging with the second guide rail, and the sliding frame also having a bearing area; a second motor, fixedly connected to the sliding frame, on which a second gear is fixedly mounted at the output end, the second gear meshing with the second rack; a second lead screw, rotatably mounted on the sliding frame, on which a first synchronous pulley is fixedly mounted; a third motor, fixedly connected to the bottom of the sliding frame, on which a second synchronous pulley is fixedly mounted on the output shaft, the second synchronous pulley being linked to the first synchronous pulley via a first transmission belt; and a limiting rod, fixedly connected to the sliding frame, on which a pushing plate is slidably mounted, and on which a moving block is fixedly mounted, the moving block being threadedly connected to the second lead screw.

[0013] Compared with the prior art, the advantages and beneficial effects of this utility model are as follows:

[0014] 1. The conveying mechanism adopts a detachable movable plate. If a movable plate or clamping component is damaged, it can be replaced individually without stopping the entire line, which greatly improves the utilization rate of the equipment.

[0015] 2. By coordinating the cleaning mechanism, handling robots, and conveying mechanism, the entire process of cup cleaning, handling, annealing, and cooling is automated, reducing manual intervention and improving production efficiency.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1 This is a perspective view of an embodiment of the present utility model;

[0019] Figure 2 This is a schematic diagram of a vacuum suction cup according to an embodiment of the present invention;

[0020] Figure 3 This is a partial schematic diagram according to an embodiment of the present utility model;

[0021] Figure 4 This is a schematic diagram of the top plate connection according to an embodiment of the present utility model;

[0022] Figure 5 This is a schematic diagram of the movable plate according to an embodiment of the present utility model;

[0023] Figure 6 This is a schematic diagram of the clamping assembly according to an embodiment of the present utility model;

[0024] Figure 7 This is a schematic diagram of the driving component according to an embodiment of the present utility model;

[0025] Figure 8 This is a schematic diagram of the second gear connection according to an embodiment of the present utility model;

[0026] Figure 9 This is a schematic diagram of the rotating assembly according to an embodiment of the present utility model;

[0027] Figure 10 This is a schematic diagram of the heating component according to an embodiment of the present utility model;

[0028] Figure 11 This is a schematic diagram of a closed assembly according to an embodiment of the present invention.

[0029] In the diagram: 1. Cleaning mechanism; 2. Annealing mechanism; 21. Support frame; 22. Base plate; 23. Vertical plate; 24. Top plate; 25. Sealing assembly; 2501. First motor; 2502. First guide rail; 2503. Sealing plate; 2504. First rack; 2505. First gear; 26. Heating assembly; 2601. Electric push rod; 2602. Fixed plate; 2603. Guide rod; 2604. Vertical block; 2605. Screw; 2606. Adjusting frame; 2607. Electric heating copper tube; 27. Filling assembly; 2701. First connecting pipe; 2702. Second connecting pipe; 3. Conveying mechanism; 31. Moving plate; 32. Clamping assembly; 3201. Bushing; 3202. Transmission rod; 3203. Guide... Magnetic block, 3204, disc, 3205, first lead screw, 3206, slide plate, 3207, tensioning component, 3208, sliding block, 3209, connecting rod, 33, rotating assembly, 3301, concave plate, 3302, fourth motor, 3303, positioning sleeve, 3304, cylindrical rod, 3305, electromagnetic block, 34, pushing assembly, 3401, positioning plate, 3402, second rack, 3403, second guide rail, 3404, sliding frame, 3405, slider, 3406, second motor, 3407, second gear, 3408, second lead screw, 3409, third motor, 3410, limiting rod, 3411, pushing plate, 3412, moving block, 4, handling robot, 41, vacuum suction cup. Detailed Implementation

[0030] like Figures 1 to 11 As shown, an annealing production line for stretching cups includes a cleaning mechanism 1, an annealing mechanism 2, a conveying mechanism 3, and a handling robot 4.

[0031] Furthermore, the cleaning mechanism 1 is used to clean the cup body.

[0032] Furthermore, the annealing mechanism 2 is used to anneal the cup body, including:

[0033] Support frame 21 serves as the main support for annealing mechanism 2;

[0034] The bottom plate 22 has a vertical plate 23 fixedly installed on top, and a top plate 24 fixedly installed on top of the vertical plate 23, so that the bottom plate 22, the vertical plate 23 and the top plate 24 together enclose a furnace chamber with open ends, one end of which is set as the feeding end and the other end as the discharging end. The feeding end is arranged adjacent to the cleaning mechanism 1.

[0035] The annealing mechanism 2 further includes:

[0036] The sealing component 25 consists of two sets symmetrically distributed at both ends of the furnace chamber, used to close the open end of the furnace chamber to form a closed furnace chamber.

[0037] Heating component 26 is used to heat a local area inside the furnace chamber, specifically to heat the cup body;

[0038] The filling component 27 is used to fill the furnace chamber with inert gas and also to cool the cup body.

[0039] Specifically, such as Figure 11 As shown, the enclosure component 25 includes;

[0040] The first motor 2501 is fixedly installed on the top plate 24;

[0041] The first guide rail 2502 is fixedly mounted on the base plate 22 and located at the open end of the furnace hopper. A closing plate 2503 is slidably mounted inside the first guide rail 2502.

[0042] The first rack 2504 is fixedly connected to the closing plate 2503;

[0043] The first gear 2505 meshes with the first rack 2504, and the first gear 2505 is fixedly installed at the output end of the first motor 2501;

[0044] like Figure 10 As shown, the heating component 26 includes:

[0045] An electric push rod 2601 is mounted on the top plate 24 and its output shaft extends through the top plate 24 to the furnace chamber.

[0046] A fixed plate 2602 is fixedly connected to the output shaft of the electric push rod 2601. A guide rod 2603 is fixedly provided on the fixed plate 2602. The guide rod 2603 is slidably engaged with the top plate 24. A standing block 2604 is fixedly provided at the bottom of the fixed plate 2602.

[0047] The screw 2605 is threaded into the threaded hole on the vertical block 2604;

[0048] The adjusting bracket 2606 is slidably engaged with the fixed plate 2602, and one end of the adjusting bracket 2606 is rotatably connected to the screw 2605.

[0049] An electric heating copper tube 2607 is fixedly installed on the adjusting frame 2606;

[0050] The screw 2605 is used to adjust the position of the adjusting bracket 2606 to match cups of different sizes;

[0051] The filling component 27 includes:

[0052] The first connecting pipe 2701 has a first air inlet and two first air outlets;

[0053] The second connecting pipe 2702 has a second air inlet and three second air outlets, with the second air outlets extending through the top plate 24 into the furnace chamber.

[0054] Both the first and second air intakes are connected to an inert air source.

[0055] Furthermore, the conveying mechanism 3 is integrated into the annealing mechanism 2, and is used to convey the cup body in the annealing mechanism 2 to realize the complete annealing process, including:

[0056] A plurality of movable plates 31, each of the movable plates 31 being provided with at least four sets of clamping components 32, the clamping components 32 being used to fix the cup body, the movable plates 31 being in sliding engagement with guide blocks fixed on the support frame 21 and the base plate 22, and the movable plates 31 being provided with through holes;

[0057] Rotating component 33 is used to drive the clamping component 32 to rotate;

[0058] Pushing component 34 is used to push the moving plate 31.

[0059] Specifically, such as Figure 6 As shown, the clamping assembly 32 includes:

[0060] The bushing 3201 is fixedly mounted on the top of the movable plate 31 and its interior is connected to the through hole;

[0061] The transmission rod 3202 is rotatably engaged with the bushing 3201. A magnetic block 3203 is fixedly provided at its bottom, and a disc 3204 is fixedly provided at its top. The disc 3204 has four circumferentially distributed sliding grooves.

[0062] The first lead screw 3205 is fixedly mounted on the disc 3204;

[0063] Four sliding plates 3206 are respectively slidably disposed in four sliding grooves. A support member 3207 is fixedly installed on the sliding plate 3206. The support member 3207 is a ceramic part.

[0064] The sliding block 3208 is threadedly connected to the first lead screw 3205. A connecting rod 3209 is rotatably mounted on the sliding block 3208, and the other end of the connecting rod 3209 is rotatably connected to the slide plate 3206.

[0065] The rotating component 33 includes:

[0066] A concave plate 3301 is fixedly disposed at the bottom of the base plate 22;

[0067] The fourth motor 3302 is fixedly connected to the concave plate 3301 and its output shaft passes through the concave plate 3301. A third synchronous pulley is fixedly provided on the output shaft of the fourth motor 3302.

[0068] The positioning sleeve 3303 is fixedly connected to the bottom of the base plate 22;

[0069] A cylindrical rod 3304 is rotatably connected to the positioning sleeve 3303 and extends through the bottom plate 22 to the furnace chamber. A fourth synchronous pulley is fixedly provided at the bottom of the cylindrical rod 3304. The fourth synchronous pulley is linked with the third synchronous pulley through the second transmission belt. An electromagnetic block 3305 that cooperates with the magnetic block 3203 is fixedly provided at the top of the cylindrical rod 3304.

[0070] like Figures 7 to 8 As shown, at least two sets of the pushing components 34 are provided and symmetrically distributed at both ends of the furnace chamber. Each set of the pushing components 34 includes:

[0071] A positioning plate 3401 is fixedly connected to the support frame 21, and a second rack 3402 and a second guide rail 3403 are installed on the positioning plate 3401.

[0072] The sliding frame 3404 has a slider 3405 fixedly mounted on it. The slider 3405 is in sliding engagement with the second guide rail 3403. The sliding frame 3404 is also provided with a load-bearing area.

[0073] The second motor 3406 is fixedly connected to the slide frame 3404. The output end of the second motor 3406 is fixedly provided with a second gear 3407, which meshes with the second rack 3402.

[0074] The second lead screw 3408 is rotatably mounted on the sliding frame 3404, and the first synchronous pulley is fixedly mounted on the second lead screw 3408.

[0075] The third motor 3409 is fixedly connected to the bottom of the sliding frame 3404. The output shaft of the third motor 3409 is fixedly provided with a second synchronous pulley. The second synchronous pulley is linked with the first synchronous pulley through the first transmission belt.

[0076] The limiting rod 3410 is fixedly connected to the sliding frame 3404. A push plate 3411 is slidably arranged on the limiting rod 3410. A moving block 3412 is fixedly arranged on the push plate 3411. The moving block 3412 is threadedly connected to the second lead screw 3408.

[0077] The modular moving plate 31, together with the push component 34, forms a reusable production line, facilitating maintenance and replacement.

[0078] Furthermore, such as Figure 2As shown, the transport robot 4 has two sets. One set is located between the feeding end and the cleaning mechanism 1, and is used to transport the cleaned cups to the conveying mechanism 3. The other set is located at the discharging end, and is used to remove the cups from the conveying mechanism 3. The transport robot 4 is equipped with a vacuum suction cup 41 for gripping the cups.

[0079] An annealing production line for stretching cup bodies operates on the following principle:

[0080] The cup body is cleaned by cleaning mechanism 1;

[0081] After cleaning, the handling robot 4 uses the vacuum suction cup 41 to grab the cup and place it on the moving plate 31, and then fits it onto the positioning fixture with the cup opening facing down.

[0082] The first motor 2501 drives the first gear 2505 to rotate, and the second gear 3407 drives the first rack 2504 to move, which in turn drives the closing plate 2503 to move and close the open end of the furnace chamber.

[0083] Inert gas is filled into the furnace chamber through the second connecting pipe 2702;

[0084] The second motor 3406 drives the second gear 3407 to rotate. The rotation of the second gear 3407 on the second rack 3402 is converted into a force that drives the sliding frame 3404 to move (upward or downward, controlled by the rotation direction of the second gear 3407). This causes the sliding frame 3404 to move upward until the moving plate 31 on it matches the guide groove. Then, the third motor 3409 drives the second synchronous pulley to rotate. The first transmission belt drives the first synchronous pulley to rotate, which in turn drives the second lead screw 3408 to rotate. This drives the moving block 3412, causing the pusher plate 3411 to move and push the moving plate 31 (during this process, the sealing mechanism releases the seal on the furnace chamber, i.e., the output direction of the first motor 2501).

[0085] The electromagnet is activated, generating a coupling force between the electromagnet and the magnetic block 3203. This force drives the third synchronous pulley to rotate via the fourth motor 3302, which in turn drives the fourth synchronous pulley to rotate via the second transmission belt. This, in turn, drives the cylindrical rod 3304 and the electromagnet 3305 on it to rotate. The rotation of the electromagnet 3305 causes the magnetic block 3203 located directly above it to rotate, causing the transmission rod 3202 and the disc 3204 to rotate. The disc 3204 drives the lead screw to rotate, which in turn drives the tensioning member 3207 to fix the cup body, thereby synchronously driving the cup body to rotate.

[0086] The cup body is heated by an electric heating copper tube 2607;

[0087] While heating, the movable plate 31 adjacent to the heating position is pushed to the second air outlet of the second connecting pipe 2702 to cool the cup body.

Claims

1. An annealing production line for stretching cup bodies, characterized in that: include: A cleaning mechanism is used to clean the cup body; An annealing mechanism, used for annealing the cup body, includes: The support frame serves as the main support for the annealing mechanism; The bottom plate has a vertical plate fixed on top, and a top plate is fixed on the top of the vertical plate, so that the bottom plate, vertical plate and top plate together enclose a furnace chamber with open ends, one end is the feeding end and the other end is the discharging end. The feeding end is arranged adjacent to the cleaning mechanism. A conveying mechanism, integrated within the annealing mechanism, is used to convey the cup body within the annealing mechanism to achieve a complete annealing process, including: A plurality of movable plates, each of which is provided with at least four sets of clamping components for fixing the cup body; Rotating component, used to drive the clamping component to rotate; A pushing component is used to push the moving board; The transport robot consists of two sets. One set is located between the feeding end and the cleaning mechanism to transport the cleaned cups to the conveying mechanism. The other set is located at the discharging end to remove the cups from the conveying mechanism. The transport robot is equipped with a vacuum suction cup for gripping the cups.

2. The annealing production line for a stretched cup body according to claim 1, characterized in that: The annealing mechanism also includes: The sealing assembly consists of two sets symmetrically distributed at both ends of the furnace chamber, used to close the open ends of the furnace chamber to form a closed furnace chamber. The heating component heats a localized area within the furnace chamber, which is used to heat the cup body; The filling component fills the furnace chamber with inert gas and also serves to cool the cup body.

3. The annealing production line for a stretched cup body according to claim 2, characterized in that: The single enclosed component includes; The first motor is fixedly mounted on the top plate; The first guide rail is fixedly mounted on the base plate and located at the open end of the furnace hopper. A sealing plate is slidably mounted inside the first guide rail. The first rack is fixedly connected to the closing plate; The first gear meshes with the first rack, and the first gear is fixedly installed at the output end of the first motor.

4. The annealing production line for a stretched cup body according to claim 3, characterized in that: The heating component includes: An electric actuator is mounted on the top plate and its output shaft extends through the top plate to the furnace chamber. A fixed plate is fixedly connected to the output shaft of the electric push rod. A guide rod is fixedly provided on the fixed plate. The guide rod is slidably engaged with the top plate. A vertical block is fixedly provided at the bottom of the fixed plate. The screw is threaded into the threaded hole on the vertical block; The adjusting frame is slidably fitted with the fixed plate, and one end of the adjusting frame is rotatably connected to the screw. An electrically heated copper tube is fixedly installed on the adjustment frame.

5. The annealing production line for a stretched cup body according to claim 4, characterized in that: The filling component includes: The first connecting pipe has a first air inlet and two first air outlets; The second connecting pipe has a second air inlet and three second air outlets, with the second air outlets extending through the top plate into the furnace chamber. Both the first and second air intakes are connected to an inert air source.

6. The annealing production line for a stretched cup body according to claim 1, characterized in that: The clamping assembly includes: A bushing is fixedly mounted on the top of the movable plate and its interior is connected to a through hole in the movable plate. The transmission rod is rotatably engaged with the bushing. A magnetic block is fixed at its bottom and a disc is fixed at its top. The disc has four circumferentially distributed grooves. The first lead screw is fixed on the disc; Four sliding plates are respectively slidably disposed in four sliding grooves, and a support member is fixedly installed on the sliding plate. The support member is a ceramic part. A sliding block is threadedly connected to the first lead screw, and a connecting rod is rotatably mounted on the sliding block, with the other end of the connecting rod rotatably connected to the sliding plate; The rotating component includes: A concave plate is fixedly installed at the bottom of the base plate; A fourth motor is fixedly connected to a concave plate, and its output shaft passes through the concave plate. A third synchronous pulley is fixedly provided on the output shaft of the fourth motor. A positioning sleeve is fixedly connected to the bottom of the base plate; A cylindrical rod is rotatably connected to the positioning sleeve and extends through the bottom plate to the furnace chamber. A fourth synchronous pulley is fixedly provided at the bottom of the cylindrical rod. The fourth synchronous pulley is linked with the third synchronous pulley through the second transmission belt. An electromagnetic block that cooperates with the magnetic block is fixedly provided at the top of the cylindrical rod.

7. The annealing production line for a stretched cup body according to claim 6, characterized in that: The propulsion assembly is provided in at least two sets and is symmetrically distributed at both ends of the furnace chamber. Each set of the propulsion assembly includes: A positioning plate is fixedly connected to the support frame, and a second rack and a second guide rail are mounted on the positioning plate. A sliding frame is provided with a slider fixed on it, the slider being in sliding engagement with a second guide rail, and the sliding frame is also provided with a load-bearing area; The second motor is fixedly connected to the slide frame, and the output end of the second motor is fixedly provided with a second gear, which meshes with the second rack; The second lead screw is rotatably mounted on the sliding frame, and the first synchronous pulley is fixedly mounted on the second lead screw; A third motor is fixedly connected to the bottom of the sliding frame. A second synchronous pulley is fixedly mounted on the output shaft of the third motor. The second synchronous pulley is linked to the first synchronous pulley through a first transmission belt. A limiting rod is fixedly connected to the sliding frame. A push plate is slidably mounted on the limiting rod. A moving block is fixedly mounted on the push plate. The moving block is threadedly connected to the second lead screw.

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