A lithium battery aging test device

Abstract

The present invention relates to the field of battery testing technology, and specifically to a lithium battery aging test device, comprising an aging cabinet having two symmetrically arranged cabinet door mechanisms fixedly mounted at the front end of the cabinet, a control box mounted at the top of the cabinet, and a plurality of support plates fixedly mounted inside the cabinet. The upper ends of the support plates are provided with a plurality of protective mechanisms, and a partition plate is provided between two adjacent protective mechanisms. The upper ends of the side surfaces of the partition plates are affixed with rubber sheets. By providing a protective mechanism, the present invention collects and discharges the energy generated by an explosion backward, preventing the explosion from harming personnel located in the front area. Furthermore, the exploding lithium battery will not affect lithium batteries in other areas. As the cabinet door opens, the protective mechanism automatically opens and delivers the battery, making it easier for personnel to remove the test battery.

Description

Technical Field

[0001] The present invention relates to the technical field of battery testing, and in particular to a lithium battery aging testing device. Background Art

[0002] Lithium batteries are a type of battery that uses lithium metal or lithium alloys as positive and negative electrode materials and a non-aqueous electrolyte solution. During the lithium battery production process, lithium batteries are subjected to cycle aging tests before production. Testing methods include constant current charge and discharge tests and capacity tests at different rates. Constant current charge and discharge tests involve charging lithium-ion batteries at a constant current under a specified temperature environment until the set charge cutoff voltage is reached, and then discharging them at a constant current until the discharge cutoff voltage is reached. By recording the charge and discharge capacity of each cycle, the battery capacity decay with the number of cycles can be observed. Capacity testing at different rates involves testing at multiple charge and discharge rates in addition to testing at a single rate. Battery capacity exhibits different performance at different rates. At high rates, battery polarization is more severe, and capacity decay may be faster. Testing is typically performed in an aging cabinet, where a certain number of batteries are simultaneously charged and discharged. During testing, if there are quality issues with the batteries, they may explode. Existing aging cabinets are unable to protect workers in the event of an explosion. Summary of the Invention

[0003] In order to overcome the defects in the prior art, the purpose of the present invention is to provide a lithium battery aging test device to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned object, the present invention provides a lithium battery aging test device, comprising an aging cabinet, wherein two symmetrically arranged cabinet door mechanisms are fixedly installed at the front end of the aging cabinet, a control box is installed at the top of the aging cabinet, and a plurality of support plates are fixedly installed inside the aging cabinet, wherein a plurality of protective mechanisms are provided at the upper ends of the support plates, a partition plate is provided between two adjacent protective mechanisms, and a rubber sheet is attached to the upper ends of the side surfaces of the partition plate;

[0005] The protection mechanism includes an upper cover mechanism, a moving mechanism arranged on the lower side of the upper cover mechanism, a test box arranged on the left side of the upper cover mechanism, and a fixing mechanism arranged on the upper surface of the moving mechanism;

[0006] The upper cover mechanism includes a half gear, a connecting plate fixedly mounted on the top of the half gear, an upper cover plate arranged on the top of the connecting plate, and a front cover plate arranged on the right end of the upper cover plate. A fixed shaft is arranged inside the half gear, and the fixed shaft is fixedly connected to the side surface of the partition plate.

[0007] The mobile mechanism includes a mobile platform, two racks fixedly connected to the left and right sides of the mobile platform, and a clamping handle fixedly connected to the front end of the racks. A threaded rod is threadedly connected to the inside of the rack on the right side, and one end of the threaded rod is fixedly connected to a driven sprocket. An auxiliary rod is slidably connected to the inside of the rack on the left side.

[0008] The fixing mechanism includes a wire clamping plate, two wire clamping grooves on both sides of the upper surface of the wire clamping plate, and a fixing plate welded to the top of the front surface of the wire clamping plate. A lifting rod is slidably connected to the fixing plate, an auxiliary rope is connected to the inside of the lifting rod, and the lower end of the lifting rod is fixedly connected to the upper limit plate. A spring is provided between the upper surface of the limiting plate and the lower surface of the fixing plate, and a rubber pad is provided on the lower surface of the limiting plate.

[0009] As a further improvement of the present technical solution, the cabinet door mechanism includes a rotating frame fixedly mounted on one side of the front surface of the aging cabinet, a rotating shaft rotatably connected to the inside of the rotating frame, and a cabinet door mounted on the rotating shaft. A number of worm gears are mounted on the side surface of the rotating shaft, a worm is meshedly mounted on one side of the worm gear, a transmission rod is welded to the end of the worm, and the outer surface of the transmission rod is rotatably connected to two support blocks, the support blocks are welded to the side surface of the aging cabinet, a driving sprocket is mounted on the other end of the transmission rod, and an empty groove for placing the worm gear is opened on the side surface of the cabinet door.

[0010] As a further improvement of the present technical solution, a transmission sprocket fixing rod will be welded to the outer end of the threaded rod inside the moving mechanism near one end of the driving sprocket, a transmission sprocket will be installed on the transmission sprocket fixing rod, a transmission chain will be installed between the transmission sprocket and the driving sprocket, and a chain will be connected between the driven sprockets of the two moving mechanisms located in the same row on the same side.

[0011] As a further improvement of the present technical solution, the aging cabinet and its internal structure are both made of explosion-proof materials, and the height of the protection mechanism is equal to half the height of the partition plate.

[0012] As a further improvement of the present technical solution, the auxiliary rope is an elastic rope, the top end of the auxiliary rope is fixedly connected to the lower surface of the upper cover plate, and there is a gap between the lower surface of the upper cover plate and the upper surface of the wire clamping plate.

[0013] As a further improvement of the present technical solution, the half gear is meshedly connected to the rack, and the distance between the wire clamping grooves is equal to the width of the fixing plate.

[0014] As a further improvement of this technical solution, the aging cabinet is divided into left and right sides with the two cabinet door mechanisms as dividing points, and the threaded grooves opened on the threaded rods inside the two parts of the protective mechanisms on the left and right sides of the aging cabinet are in opposite directions.

[0015] As a further improvement of the present technical solution, a gap is left between the cabinet door and the front surface of the aging cabinet, and the height of the empty groove opened on the side surface of the cabinet door is greater than the thickness of the worm.

[0016] As a further improvement of the present technical solution, a pull handle is installed on the front surface of the cabinet door, and the cabinet door is made of explosion-proof plastic.

[0017] As a further improvement of the present technical solution, the control box is electrically connected to the test box, and the test wires extending from the test box are clamped in the wire clamping slot.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. This lithium battery aging test equipment has a protective mechanism. If a lithium battery undergoing aging testing in the aging cabinet explodes, the energy generated by the explosion will usually flow backward through the gap between the wire clamping plate and the upper cover mechanism under the dual protection of the protective mechanism and the cabinet door mechanism, and will not cause harm to the staff in the fan-shaped area in front of the aging cabinet.

[0020] 2. The lithium battery aging test equipment, the interior of the aging cabinet is made of explosion-proof materials. When the lithium battery in one of the protection mechanisms explodes, it will not affect the lithium batteries in other areas.

[0021] 3. When the user opens the cabinet door of the lithium battery aging test equipment, the threaded rod can automatically push the mobile platform outward with the cooperation of the worm gear and sprocket chain. As the mobile platform is pushed, the upper cover mechanism opens upward and pulls up the fixed plate, making it convenient for the staff to remove the test battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the drawings are merely illustrative and are used to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to specific circumstances under the guidance of the present invention.

[0023] Figure 1 It is a schematic diagram of the overall assembly structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the overall back structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the aging cabinet of the present invention;

[0026] Figure 4 This is a schematic diagram of the protection mechanism structure of the present invention;

[0027] Figure 5 This is a schematic diagram of the upper cover structure of the present invention;

[0028] Figure 6 It is a schematic structural diagram of the mobile mechanism of the present invention;

[0029] Figure 7 It is a structural schematic diagram of the fixing mechanism of the present invention;

[0030] Figure 8 This is a schematic diagram of the cabinet door mechanism structure of the present invention;

[0031] Figure 9 This is a schematic diagram of the transmission sprocket installation structure of the present invention;

[0032] The meaning of each number in the figure is:

[0033] 1. Aging cabinet; 11. Support plate; 12. Protection mechanism; 121. Upper cover mechanism; 1211. Half gear; 1212. Fixed shaft; 1213. Connecting plate; 1214. Upper cover; 1215. Front cover; 122. Moving mechanism; 1221. Moving platform; 1222. Snap-on handle; 1223. Rack; 1224. Threaded rod; 1225. Driven sprocket; 1226. Auxiliary rod; 123. Test box; 124. Fixing mechanism; 1241. Wire clamping plate; 1242. Wire clamping groove; 1243. Fixing plate; 1244. Auxiliary rope; 1245. Lifting rod; 1246. Spring; 1247. Limiting plate; 1248. Rubber pad; 13. Partition plate; 14. Rubber sheet;

[0034] 2. Cabinet door mechanism; 21. Rotating frame; 22. Cabinet door; 23. Rotating shaft; 24. Worm gear; 25. Worm; 26. Support block; 27. Transmission rod; 28. Driving sprocket;

[0035] 3. Control box;

[0036] 4. Transmission sprocket; 41. Transmission sprocket fixing rod; 5. Transmission chain. DETAILED DESCRIPTION

[0037] The details of the present invention can be more clearly understood in conjunction with the accompanying drawings and the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are for the purpose of explaining the present invention only and are not to be construed as limiting the present invention in any way. Based on the teachings of the present invention, skilled artisans can conceive of any possible variations based on the present invention, which should be considered to fall within the scope of the present invention. The terms "mounted" and "connected" should be understood broadly and can refer to direct connection or indirect connection through an intermediary.

[0038] The terms "central axis," "vertical," "horizontal," "front," "back," "up," "down," "left," "right," "top," "bottom," "inside," and "outside" used herein to indicate positions or location relationships are based on the positions or location relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, in the description of the present invention, "several" means two or more, unless otherwise specifically defined.

[0039] See also Figures 1-9 As shown, the present invention provides a lithium battery aging test equipment, including an aging cabinet 1, two symmetrically arranged cabinet door mechanisms 2 are fixedly installed at the front end of the aging cabinet 1, a control box 3 is installed at the top of the aging cabinet 1, and a plurality of support plates 11 are fixedly installed inside the aging cabinet 1. A plurality of protection mechanisms 12 are provided on the upper ends of the support plates 11. A partition plate 13 is provided between two adjacent protection mechanisms 12. A rubber sheet 14 is attached to the upper ends of the side surfaces of the partition plates 13. The partition plates 13 isolate the protection mechanisms 12 from each other to prevent mutual influence in the event of an explosion.

[0040] The protection mechanism 12 includes a cover 121, a mobile mechanism 122 disposed below the cover 121, a test box 123 disposed on the left side of the cover 121, and a fixing mechanism 124 disposed on the upper surface of the mobile mechanism 122. It can protect the battery from five directions: top, bottom, left, right, and front. It guides the heat generated by the explosion backwards without affecting personnel in the front.

[0041] The upper cover mechanism 121 includes a half gear 1211, a connecting plate 1213 fixedly mounted on the top of the half gear 1211, an upper cover plate 1214 disposed on the top of the connecting plate 1213, and a front cover plate 1215 disposed on the right end of the upper cover plate 1214. A fixed shaft 1212 is disposed within the half gear 1211 and fixedly connected to the side surface of the partition plate 13, so that the half gear 1211 can rotate with the movement of the rack 1223. Therefore, when the movable platform 1221 moves outward, the half gear 1211 can drive the upper cover mechanism 121 to rotate upward and open.

[0042] The moving mechanism 122 includes a moving platform 1221, two racks 1223 fixedly connected to the left and right sides of the moving platform 1221, and a clamping handle 1222 fixedly connected to the front end of the racks 1223. A threaded rod 1224 is threadedly connected to the inside of the right rack 1223, and one end of the threaded rod 1224 is fixedly connected to a driven sprocket 1225. An auxiliary rod 1226 is slidably connected to the inside of the left rack 1223. Rotation of the threaded rod 1224 pushes the moving platform 1221 outward.

[0043] The fixing mechanism 124 includes a wire clamping plate 1241, two wire clamping grooves 1242 on both sides of the upper surface of the wire clamping plate 1241, and a fixing plate 1243 welded to the top of the front surface of the wire clamping plate 1241. A lifting rod 1245 is slidably connected to the fixing plate 1243, and an auxiliary rope 1244 is connected to the inside of the lifting rod 1245. The lower end of the lifting rod 1245 is fixedly connected to a limiting plate 1247. A spring 1246 is provided between the upper surface of the limiting plate 1247 and the lower surface of the fixing plate 1243. A rubber pad 1248 is provided on the lower surface of the limiting plate 1247. The limiting plate 1247 presses the lithium battery to limit the lithium battery. Under the connection of the auxiliary rope 1244, when the upper cover mechanism 121 is opened upward, the lifting rod 1245 will be pulled upward, so that the limiting plate 1247 moves upward to release the limit on the battery.

[0044] Specifically, the cabinet door mechanism 2 includes a rotating frame 21 fixedly installed on one side of the front surface of the aging cabinet 1, a rotating shaft 23 rotatably connected to the inside of the rotating frame 21, and a cabinet door 22 installed on the rotating shaft 23. A number of worm gears 24 are installed on the side surface of the rotating shaft 23. A worm 25 is meshed and installed on one side of the worm gear 24. A transmission rod 27 is welded to the end of the worm 25. The outer surface of the transmission rod 27 is rotatably connected to two support blocks 26. The support blocks 26 are welded to the side surface of the aging cabinet 1. A driving sprocket 28 is installed on the other end of the transmission rod 27. An empty groove is provided on the side surface of the cabinet door 22 for placing the worm gear 24. When the cabinet door 22 rotates, the rotating shaft 23 will rotate with the rotation of the cabinet door 22, so that the worm gear 24 installed on the rotating shaft 23 rotates and drives the worm 25 to rotate.

[0045] Furthermore, a transmission sprocket fixing rod 41 will be welded to the outer end of the threaded rod 1224 inside the moving mechanism 122 near one end of the driving sprocket 28, and a transmission sprocket 4 will be installed on the transmission sprocket fixing rod 41. A transmission chain 5 will be installed between the transmission sprocket 4 and the driving sprocket 28. A chain will be connected between the driven sprockets 1225 of the two moving mechanisms 122 located in the same row on the same side, so that the two moving mechanisms 122 on the same side will move synchronously.

[0046] Specifically, the aging cabinet 1 and its internal structure are made of explosion-proof materials. The height of the protection mechanism 12 is equal to half the height of the partition plate 13, and space is reserved for opening the upper cover mechanism 121.

[0047] In addition, the auxiliary rope 1244 is an elastic rope, and the top end of the auxiliary rope 1244 is fixedly connected to the lower surface of the upper cover plate 1214. There is a gap between the lower surface of the upper cover plate 1214 and the upper surface of the wire clamping plate 1241 to facilitate the flow of heat generated by the explosion.

[0048] Furthermore, the half gear 1211 is meshed with the rack 1223 , and the distance between the wire clamping slots 1242 is equal to the width of the fixing plate 1243 , so that the test wires extending from the test box 123 can be clamped into the wire clamping slots 1242 .

[0049] Specifically, the aging cabinet 1 is divided into left and right sides with the two cabinet door mechanisms 2 as the dividing point. The threaded grooves on the threaded rods 1224 inside the two protective mechanisms 12 on the left and right sides of the aging cabinet 1 are in opposite directions. Since the cabinet doors 22 on both sides rotate in different directions, the threaded grooves on the threaded rods 1224 need to be in opposite directions so that the moving mechanisms 122 on the left and right sides can move outward.

[0050] It is worth noting that there is a gap between the cabinet door 22 and the front surface of the aging cabinet 1. The height of the slot opened on the side surface of the cabinet door 22 is greater than the thickness of the worm 25 to prevent the cabinet door 22 from hitting the worm 25 when it is opened.

[0051] Furthermore, a pull handle is installed on the front surface of the cabinet door 22. The cabinet door 22 is made of explosion-proof plastic. The cabinet door 22 serves as a second line of protection. The pull handles can be fixed by installing a padlock.

[0052] Furthermore, the control box 3 is electrically connected to the test box 123 , and the test line extending from the test box 123 is clamped in the line clamping slot 1242 . The test line moves as the line clamping plate 1241 moves, making it easier for the staff to connect the test line to the lithium battery.

[0053] It is worth mentioning that the structures and working principles of the control box 3 and the test box 123 involved in this embodiment are well known to those skilled in the art and are not elaborated herein.

[0054] The present invention is suitable for use in aging tests on lithium batteries. When in use, the staff pulls the pull handle installed on the surface of the cabinet door 22 and slowly pulls the cabinet door 22 outward. As the cabinet door 22 rotates, the rotating shaft 23 connected to the cabinet door 22 also rotates. The rotating shaft 23 drives the worm wheel 24 and the worm 25 to start transmission. Then, the active sprocket 28 installed at the end of the worm 25 cooperates with the transmission chain to transmit the rotation to the position of the driven sprocket 1225. The driven sprocket 1225 controls the threaded rod 1224 to rotate, thereby achieving the purpose of pushing the mobile platform 1221 outward. As the mobile platform 1221 moves outward, the racks 1223 on both sides of the mobile platform 1221 The upper cover mechanism 121 engaged at the upper end will also be synchronously rotated upward to open. As the upper cover mechanism 121 rotates upward, the lifting rod 1245 will also move upward under the pull of the auxiliary rope 1244, so that the limit plate 1247 moves upward and leaves the surface of the mobile platform 1221. Then the staff can connect the test line to the lithium battery to be tested and place it on the lower side of the limit plate 1247. After placement, close the cabinet door 22. After the above steps are carried out in the opposite direction, as the cabinet door 22 is closed, the threaded rod 1224 will return the mobile mechanism 122 to its original position and cover the upper cover mechanism 121 and press the limit plate 1247 on the surface of the lithium battery. Then wait for the aging test.

[0055] If an explosion occurs during the test process, the aging cabinet 1, the protective mechanism 12 and the cabinet door 22 made of explosion-proof materials can withstand the explosion while guiding the energy generated by the explosion to the wire clamping plate 1241, that is, the rear side of the protective mechanism 12, to prevent it from affecting the staff usually located in the front side of the aging cabinet 1. If no explosion occurs during the test process, wait until the test is completed and then open the cabinet door 22 to remove the lithium battery.

[0056] It should be noted that the above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made in accordance with the spirit and substance of the present invention are intended to be encompassed within the scope of protection of the present invention.

Claims

1. A lithium battery aging test device, comprising an aging cabinet (1), characterized in that: The front end of the aging cabinet (1) is fixedly mounted with two symmetrically arranged cabinet door mechanisms (2), the top of the aging cabinet (1) is mounted with a control box (3), a plurality of support plates (11) are fixedly mounted inside the aging cabinet (1), a plurality of protection mechanisms (12) are arranged on the upper ends of the support plates (11), a partition plate (13) is arranged between two adjacent protection mechanisms (12), and a rubber sheet (14) is attached to the upper ends of the side surfaces of the partition plates (13); The protection mechanism (12) comprises an upper cover mechanism (121), a moving mechanism (122) arranged on the lower side of the upper cover mechanism (121), a test box (123) arranged on the left side of the upper cover mechanism (121), and a fixing mechanism (124) arranged on the upper surface of the moving mechanism (122); The upper cover mechanism (121) comprises a half gear (1211), a connecting plate (1213) fixedly mounted on the top of the half gear (1211), an upper cover (1214) arranged at the top of the connecting plate (1213), and a front cover (1215) arranged at the right end of the upper cover (1214); a fixed shaft (1212) is arranged inside the half gear (1211), and the fixed shaft (1212) is fixedly connected to the side surface of the partition plate (13); The moving mechanism (122) comprises a moving platform (1221), two racks (1223) fixedly connected to the left and right sides of the moving platform (1221), and a clamping handle (1222) fixedly connected to the front ends of the racks (1223); the rack (1223) on the right side is internally threadedly connected to a threaded rod (1224); one end of the threaded rod (1224) is fixedly connected to a driven sprocket (1225); and the rack (1223) on the left side is internally slidably connected to an auxiliary rod (1226); The fixing mechanism (124) comprises a wire clamping plate (1241), two wire clamping grooves (1242) provided on both sides of the upper surface of the wire clamping plate (1241), and a fixing plate (1243) welded to the top of the front surface of the wire clamping plate (1241); a lifting rod (1245) is slidably connected inside the fixing plate (1243); an auxiliary rope (1244) is connected inside the lifting rod (1245); the lower end of the lifting rod (1245) is fixedly connected to a limiting plate (1247); a spring (1246) is provided between the upper surface of the limiting plate (1247) and the lower surface of the fixing plate (1243); and a rubber pad (1248) is provided on the lower surface of the limiting plate (1247).

2. The lithium battery aging test device according to claim 1, wherein: The cabinet door mechanism (2) comprises a rotating frame (21) fixedly mounted on one side of the front surface of the aging cabinet (1), a rotating shaft (23) rotatably connected to the inside of the rotating frame (21), and a cabinet door (22) mounted on the rotating shaft (23), a plurality of worm wheels (24) being mounted on the side surface of the rotating shaft (23), a worm (25) being meshedly mounted on one side of the worm wheel (24), a transmission rod (27) being welded to the end of the worm (25), an outer surface of the transmission rod (27) being rotatably connected to two support blocks (26), the support blocks (26) being welded to the side surface of the aging cabinet (1), a driving sprocket (28) being mounted on the other end of the transmission rod (27), and a slot for placing the worm wheel (24) being provided on the side surface of the cabinet door (22).

3. The lithium battery aging test device according to claim 2, characterized in that: A transmission sprocket fixing rod (41) is welded to the outer end of the threaded rod (1224) inside the moving mechanism (122) near one end of the driving sprocket (28), a transmission sprocket (4) is mounted on the transmission sprocket fixing rod (41), a transmission chain (5) is mounted between the transmission sprocket (4) and the driving sprocket (28), and a chain is connected between the driven sprockets (1225) of the two moving mechanisms (122) located on the same side and in the same row.

4. The lithium battery aging test device according to claim 2, wherein: The aging cabinet (1) and its internal structure are made of explosion-proof materials, and the height of the protection mechanism (12) is equal to half the height of the partition plate (13).

5. The lithium battery aging test device according to claim 2, characterized in that: The auxiliary rope (1244) is an elastic rope, the top end of the auxiliary rope (1244) is fixedly connected to the lower surface of the upper cover plate (1214), and a gap exists between the lower surface of the upper cover plate (1214) and the upper surface of the wire clamping plate (1241).

6. The lithium battery aging test device according to claim 2, characterized in that: The half gear (1211) is meshedly connected with the rack (1223), and the distance between the wire clamping grooves (1242) is equal to the width of the fixing plate (1243).

7. The lithium battery aging test device according to claim 2, characterized in that: The aging cabinet (1) is divided into left and right sides with the two cabinet door mechanisms (2) as a dividing point, and the threaded grooves on the threaded rods (1224) inside the two parts of the protection mechanism (12) on the left and right sides of the aging cabinet (1) are arranged in opposite directions.

8. The lithium battery aging test device according to claim 2, characterized in that: A gap is left between the cabinet door (22) and the front surface of the aging cabinet (1), and the height of the slot opened on the side surface of the cabinet door (22) is greater than the thickness of the worm (25).

9. The lithium battery aging test device according to claim 2, characterized in that: A pull handle is installed on the front surface of the cabinet door (22), and the cabinet door (22) is made of explosion-proof plastic.

10. The lithium battery aging test equipment according to claim 2, characterized in that: The control box (3) is electrically connected to the test box (123), and the test line extending from the test box (123) is clamped inside the clamping groove (1242).

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