A sliding valve vacuum pump

Abstract

This application relates to the technical field of vacuum pumps. A slide valve vacuum pump includes a pump body, an adjusting seat, a drive motor, a transmission assembly, a main shaft, and a slide valve eccentric wheel mechanism. The slide valve eccentric wheel mechanism is located within the pump body. The main shaft is coaxially rotatably connected to the pump body to drive the slide valve eccentric wheel mechanism. The rotation axis of the main shaft is horizontal. One end of the adjusting seat is rotatably connected to the upper end of the pump body, and the rotation axis of the adjusting seat is parallel to the rotation axis of the main shaft. The drive motor is connected to the adjusting seat. The transmission assembly includes pulleys and a belt. There are two pulleys, which are coaxially connected to the output shaft of the drive motor and the main shaft, respectively. The belt is sleeved on the outer circumference of the two pulleys. Depending on the state of the belt, rotating the adjusting seat drives the drive motor to rotate, which in turn moves the pulleys connected to the output shaft of the drive motor. This ensures that the belt sleeved on the outer circumference of the two pulleys is in a tensioned state, which helps to stably transmit the torque provided by the output shaft of the drive motor to the main shaft and improves the stability of power transmission.

Description

Technical Field

[0001] This application relates to the technical field of vacuum pumps, and in particular to a slide valve vacuum pump. Background Technology

[0002] A slide valve vacuum pump is a vacuum device used to pump out general gases or gases containing a small amount of condensable vapors. It is widely used in industries such as aviation, atomic, petroleum, chemical, pharmaceutical, and electrical engineering.

[0003] The motors of existing slide valve vacuum pumps are directly fixed to the housing with bolts, and the main shaft is driven to rotate through a belt drive to achieve vacuum pumping. However, after long-term use, the loosening and wear of the belt drive can lead to unstable power transmission, reduce the pumping efficiency of the vacuum pump, and thus affect the performance of the entire vacuum system. Utility Model Content

[0004] In order to facilitate the adjustment of the position of the drive motor, so as to tension the belt between the two pulleys and improve the stability of the belt transmission, this application provides a slide valve vacuum pump.

[0005] The slide valve vacuum pump provided in this application adopts the following technical solution: A slide valve vacuum pump includes a pump body, an adjusting seat, a drive motor, a transmission assembly, a main shaft, and a slide valve eccentric wheel mechanism. The slide valve eccentric wheel mechanism is located within the pump body. The main shaft is coaxially rotatably connected to the pump body to drive the slide valve eccentric wheel mechanism. The rotation axis of the main shaft is horizontal. One end of the adjusting seat is rotatably connected to the upper end of the pump body. The rotation axis of the adjusting seat is parallel to the rotation axis of the main shaft. The drive motor is connected to the adjusting seat. The transmission assembly includes pulleys and a belt body. There are two pulleys, which are coaxially connected to the output shaft of the drive motor and the main shaft, respectively. The belt body is sleeved on the outer circumference of the two pulleys.

[0006] By adopting the above technical solution, the adjusting seat can be rotated according to the state of the belt, which will drive the drive motor to rotate and move the pulley connected to the output shaft of the drive motor. This will enable the belt fitted around the two pulleys to be in a tensioned state, which will help to stably transmit the torque provided by the output shaft of the drive motor to the main shaft and improve the stability of power transmission.

[0007] Preferably, the pulley has a plurality of V-shaped grooves on its outer periphery, the plurality of V-shaped grooves are distributed at intervals along the pulley axis, and the belt body has a plurality of belt bodies, which are respectively embedded in the plurality of V-shaped grooves.

[0008] By adopting the above technical solution, several V-shaped grooves are arranged at intervals along the axis on the outer periphery of the pulley, and several belt bodies are respectively embedded in several V-shaped grooves, which increases the contact area and friction between the belt body and the pulley, making the transmission of the transmission component more stable and improving the efficiency of the drive motor in transmitting power to the main shaft.

[0009] Preferably, the system further includes an adjustment assembly, which includes a bolt and a nut. One end of the bolt is connected to the pump body, and the bolt is vertical in its length direction. The adjustment seat has an adjustment groove, and the other end of the bolt passes through the adjustment groove. The sidewall of the bolt fits against the groove wall. Two nuts are provided, which are symmetrically distributed along the bolt length direction. The two nuts abut against both sides of the adjustment seat along the bolt axis.

[0010] By adopting the above technical solution, the tilt of the adjusting seat is adjusted by rotating the nut located below the adjusting seat, and then the adjusting seat is tightened by the nut located above the adjusting seat. The two nuts realize the fixed connection between the adjusting seat and the bolt, which improves the convenience and reliability of the height adjustment of the drive motor.

[0011] Preferably, the adjustment groove is located on the side of the adjustment seat away from the rotation axis of the adjustment seat. There are two adjustment grooves, which are symmetrically distributed along the rotation axis of the adjustment seat. The number of adjustment components is the same as the number of adjustment grooves and they correspond one-to-one.

[0012] By adopting the above technical solution, the two sets of adjustment components and adjustment grooves cooperate to reduce the possibility of the nut failing to limit the adjustment seat during use, causing the adjustment seat to rotate and the pulley connected to the drive motor to separate from the belt, thereby improving the reliability of the equipment.

[0013] Preferably, it also includes a protective cover, which is connected to the side of the pump body near the transmission assembly. The side of the protective cover near the pump body has a receiving cavity, and the transmission assembly is embedded in the receiving cavity.

[0014] By adopting the above technical solution, the transmission component is embedded in the receiving cavity of the protective cover, which can protect the transmission component, reduce the possibility of damage caused by direct impact from external objects, and improve the service life of the equipment.

[0015] Preferably, it also includes a protective net, the protective cover including a fixed part and a movable part, the fixed part being connected to the pump body, the movable part being connected to the adjusting seat, and the two ends of the protective net being connected to the movable part and the fixed part respectively.

[0016] By adopting the above technical solution, a protective net is added. The protective cover is divided into a fixed part and a movable part. The fixed part is connected to the pump body, and the movable part is connected to the adjusting seat, so that the movable part rotates with the rotation of the adjusting seat, reducing the limitation of the adjustment range of the adjusting seat by the space of the receiving cavity. The two ends of the protective net are connected to the fixed part and the movable part respectively, so that when the fixed part and the movable part are separated, the protective net can cover the gap between the fixed part and the movable part, reducing the possibility of foreign objects entering the receiving cavity through the gap between the fixed part and the movable part and affecting the normal operation of the transmission components, thus improving the reliability of the equipment.

[0017] Preferably, it also includes abutting wheels, which are embedded in the receiving cavity. The abutting wheels are located on the side of the fixed part near the moving part. The rotation axis of the abutting wheels is parallel to the rotation axis of the main shaft. The abutting wheels are used to abut against the belt body. There are a plurality of abutting wheels, which are divided into two groups. The two groups of abutting wheels are symmetrically distributed along the rotation axis perpendicular to the main shaft.

[0018] By adopting the above technical solution, as the pulley located in the moving part moves with the adjustment seat, the belt body also deflects to one side accordingly. An abutment wheel is set to abut the belt body, reducing the possibility of the belt body colliding with the cavity wall and improving the service life of the belt body.

[0019] Preferably, the protective cover also includes a first magnetic strip and a second magnetic strip. The protective cover also includes a sliding seat, which is slidably connected to the outer wall of the fixed part. The sliding direction of the sliding seat is vertical. The two ends of the protective net along the vertical direction are respectively connected to a first connecting strip and a second connecting strip. The second connecting strip is connected to the sliding seat. The first connecting strip is connected to the moving part. The first magnetic strip is connected to the side of the first connecting strip near the pump body. The second connecting strip is connected to the fixed part. The second magnetic strip is connected to the side of the second connecting strip near the pump body.

[0020] By adopting the above technical solution, the first magnetic strip is attracted to the moving part to achieve a fixed connection between the protective net and the moving part, and the second magnetic strip is attracted to the fixed part to achieve a fixed connection between the protective net and the middle section of the fixed part, so as to achieve a detachable connection of the protective net, which is convenient for the replacement or maintenance of the protective net.

[0021] Preferably, the outer wall of the movable part is connected to a mounting base, the first connecting strip abuts against the surface of the mounting base away from the sliding base, the mounting base is provided with a first slot on the side away from the sliding base, the first connecting strip is connected to a first locking block on the side near the sliding base, the first locking block is embedded in the first slot, the second connecting strip abuts against the surface of the sliding base away from the mounting base, the sliding base is provided with a second slot on the side away from the mounting base, the second connecting strip is connected to a second locking block on the side near the mounting base, the second locking block is embedded in the second slot.

[0022] By adopting the above technical solution, the first card block is embedded in the first card slot, and the second card block is embedded in the second card slot, thereby improving the stability of the connection between the protective net and the moving and fixed parts.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. Depending on the state of the belt, the adjusting seat can be rotated to drive the drive motor to rotate, which in turn drives the pulleys connected to the output shaft of the drive motor to move, so that the belt fitted around the two pulleys is in a tensioned state. This helps to stably transmit the torque provided by the output shaft of the drive motor to the main shaft and improves the stability of power transmission. 2. The tilt of the adjusting seat is adjusted by rotating the nut located below the adjusting seat, and then the adjusting seat is tightened by the nut located above the adjusting seat. The two nuts realize the fixed connection between the adjusting seat and the bolt, which improves the convenience and reliability of the height adjustment of the drive motor. 3. A protective net is added. The protective cover is divided into a fixed part and a movable part. The fixed part is connected to the pump body, and the movable part is connected to the adjusting seat. This allows the movable part to rotate with the adjusting seat, reducing the limitation of the adjusting seat's adjustment range on the cavity space. The two ends of the protective net are connected to the fixed part and the movable part respectively. When the fixed part and the movable part are separated, the protective net can cover the gap between the fixed part and the movable part, reducing the possibility of foreign objects entering the cavity through the gap between the fixed part and the movable part and affecting the normal operation of the transmission components, thus improving the reliability of the equipment. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a slide valve vacuum pump, excluding the protection mechanism.

[0025] Figure 2 This is a schematic diagram of a slide valve vacuum pump.

[0026] Figure 3 This is a cross-sectional view of a slide valve vacuum pump.

[0027] Figure 4 yes Figure 3 Enlarged view of point A in the middle.

[0028] Explanation of reference numerals in the attached figures: 1. Vacuum pump body; 11. Pump body; 111. Mounting base; 12. Main shaft; 13. Drive motor; 14. Transmission assembly; 141. Pulley; 1411. V-groove; 142. Belt body; 15. Adjusting seat; 151. Connecting seat; 1511. Adjusting groove; 152. Rotating seat; 16. Adjusting assembly; 161. Bolt; 162. Nut; 2. Protective mechanism; 21. Protective cover; 211. Receiving cavity; 212. Fixing part; 2121. Slide groove; 213. Moving part; 2131. Mounting base; 21311. First slot; 214. Sliding seat; 2141. Second slot; 2142. Slider; 22. Protective net; 221. First connecting bar; 2211. First locking block; 222. Second connecting bar; 2221. Second locking block; 23. Abutting wheel; 24. First magnetic strip; 25. Second magnetic strip. Detailed Implementation

[0029] The present application will be further described in detail below with reference to the accompanying drawings.

[0030] Reference Figure 1 This application discloses a slide valve vacuum pump including a vacuum pump body 1. The vacuum pump body 1 includes a pump body 11, a main shaft 12 and a slide valve eccentric wheel mechanism (not shown in the figure). The slide valve eccentric wheel mechanism is located inside the pump body 11. One end of the main shaft 12 is coaxially rotatably connected to the pump body 11 to drive the slide valve eccentric wheel mechanism to work. The other end of the main shaft 12 extends out of the pump body 11.

[0031] The vacuum pump body 1 also includes an adjusting seat 15. A fixed seat 111 is fixedly connected to the upper end of the pump body 11, and the fixed seat 111 is located on one side of the pump body 11 along the rotation axis perpendicular to the main shaft 12. A rotating seat 152 is fixedly connected to one end of the adjusting seat 15. The rotating seat 152 is rotatably connected to the fixed seat 111. The rotation axis of the rotating seat 152 is parallel to the rotation axis of the main shaft 12. There are two rotating seats 152, and the two rotating seats 152 are symmetrically distributed along the rotation axis of the rotating seat 152.

[0032] Reference Figure 2 The adjusting seat 15 is fixedly connected to a connecting seat 151 at the end away from the fixed seat 111. There are two connecting seats 151, which are symmetrically distributed along the rotation axis of the adjusting seat 15. An adjusting groove 1511 is provided on the side of the connecting seat 151 away from the fixed seat 111. The vacuum pump body 1 also includes an adjusting assembly 16. The number of adjusting assemblies 16 is the same as the number of adjusting grooves 1511 and they correspond one-to-one. The adjusting assembly 16 includes a bolt 161 and a nut 162. One end of the bolt 161 is fixedly connected to the upper end of the pump body 11. The axis of the bolt 161 is vertical. The other end of the bolt 161 passes through the adjusting groove 1511. The nut 162 is threadedly connected to the bolt 161. There are two nuts 162, which are symmetrically distributed along the axis of the bolt 161. The two nuts 162 respectively abut against the two sides of the connecting seat 151 along the axis of the bolt 161.

[0033] Reference Figure 1The vacuum pump body 1 also includes a drive motor 13 and a transmission assembly 14. The drive motor 13 is connected to the adjusting seat 15 to drive the main shaft 12 to rotate. In this embodiment, the housing of the drive motor 13 is fixedly connected to the surface away from the pump body 11, and the output shaft of the drive motor 13 is located on the side of the housing of the drive motor 13 closer to the main shaft 12. The axis of the output shaft of the drive motor 13 is parallel to the rotation axis of the main shaft 12. The transmission assembly 14 includes pulleys 141 and belt body 142. There are two pulleys 141, which are coaxially fixedly connected to the output shaft of the drive motor 13 and the outer periphery of the main shaft 12, respectively. The belt body 142 is sleeved on the outer periphery of the two pulleys 141. The outer periphery of the pulleys 141 is provided with a plurality of V-grooves 1411, which are spaced apart along the axis of the pulleys 141. In this embodiment, there are four V-grooves 1411, which are evenly distributed along the axis of the pulley 141. There are two pulleys 141, and the belt body 142 is embedded in the V-grooves 1411 of the two pulleys 141. The two belt bodies 142 are symmetrically distributed along the axis of the pulley 141.

[0034] Reference Figure 2 and Figure 3 A slide valve vacuum pump also includes a protection mechanism 2, which includes a protective cover 21 and an abutment wheel 23. The protective cover 21 includes a fixed part 212 and a movable part 213. The fixed part 212 is fixedly connected to the pump body 11 on the side near the pulley 141, and the movable part 213 is fixedly connected to the adjusting seat 15 on the side near the pulley 141. The movable part 213 and the fixed part 212 are provided with a receiving cavity 211 on the side near the pump body 11, and the pulley 141 and the belt 142 are both embedded in the receiving cavity 211. The abutment wheel 23 is rotatably embedded in the receiving cavity 211. The abutment wheel 23 is located within the receiving cavity 211 of the fixed part 212, on the side of the fixed part 212 closest to the moving part 213. The abutment wheel 23 is used to abut against the belt body 142. The rotation axis of the abutment wheel 23 is parallel to the rotation axis of the main shaft 12. Several abutment wheels 23 are provided, and the several abutment wheels 23 are symmetrically distributed along an axis perpendicular to the main shaft 12. In this embodiment, there are two abutment wheels 23.

[0035] Reference Figure 2 and Figure 4The protective mechanism 2 also includes a protective net 22, a first magnetic strip 24, and a second magnetic strip 25. The protective net 22 has a first connecting strip 221 and a second connecting strip 222 fixedly connected to its two ends along the vertical direction. A plurality of mounting seats 2131 are fixedly connected to the outer wall of the movable part 213. These mounting seats 2131 are spaced apart circumferentially along the movable part 213, and the surface of the mounting seat 2131 near the fixed part 212 is flush with the end of the movable part 213 near the fixed part 212. In this embodiment, three mounting seats 2131 are provided. The first connecting strip 221 abuts against the side surface of the mounting base 2131 away from the fixing part 212. The side surface of the mounting base 2131 away from the fixing part 212 is provided with a first slot 21311. A first locking block 2211 is fixedly connected to the side surface of the first connecting strip 221 near the fixing part 212. The side surface of the first locking block 2211 near the moving part 213 is flush with the end of the first connecting strip 221 near the moving part 213. The first locking block 2211 is embedded in the first slot 21311, and the side wall of the first locking block 2211 is in contact with the wall of the first slot 21311. The number of first magnetic strips 24 is the same as the number of mounting bases 2131 and corresponds one-to-one. The first magnetic strips 24 are fixedly connected to the end of the first locking block 2211 away from the first connecting strip 221. The protective cover 21 also includes a sliding seat 214, which is slidably connected to the outer wall of the fixed part 212. The sliding direction of the sliding seat 214 is vertical, and there are several sliding seats 214, which are distributed at intervals around the circumference of the fixed part 212. In this embodiment, there are three sliding seats 214. The outer wall of the fixed part 212 is provided with a groove 2121, and the number of grooves 2121 is the same as the number of sliding seats 214 and they correspond one-to-one. A slider 2142 is fixedly connected to the side surface of the sliding seat 214 near the fixed part 212. The slider 2142 is slidably embedded in the groove 2121, and the slider 2142 is a dovetail block. The second connecting strip 222 abuts against the side surface of the sliding seat 214 away from the moving part 213. The side surface of the sliding seat 214 away from the moving part 213 is provided with a second slot 2141. A second locking block 2221 is fixedly connected to the side surface of the second connecting strip 222 near the moving part 213. The side surface of the second locking block 2221 near the fixing part 212 is flush with the end of the second connecting strip 222 near the fixing part 212. The second locking block 2221 is embedded in the second slot 2141, and the side wall of the second locking block 2221 is in contact with the wall of the second slot 2141. The number of second magnetic strips 25 is the same as the number of sliding seats 214 and corresponds one-to-one. The second magnetic strips 25 are fixedly connected to the end of the second locking block 2221 away from the second connecting strip 222.

[0036] The implementation principle of a slide valve vacuum pump according to an embodiment of this application is as follows: a drive motor 13 is fixedly connected to an adjusting seat 15, two pulleys 141 are fixedly connected to the output shaft and main shaft 12 of the drive motor 13 respectively, a belt body 142 is embedded in the V-shaped groove 1411 on the outer periphery of the two belt bodies 142, a moving part 213 is fixedly connected to the adjusting seat 15, and a fixed part 212 is fixedly connected to the pump body 11, so that the pulleys 141 and belt bodies 142 are embedded in the receiving cavity 211.

[0037] The second locking block 2221 is embedded in the second locking slot 2141, and the second magnetic strip 25 attracts the sliding seat 214, thereby fixing the second connecting strip 222 and the sliding seat 214 relatively. Pulling the protective net 22 moves the sliding seat 214 upward, embedding the first locking block 2211 into the first locking slot 21311, thereby fixing the protective net 22 and the fixing part 212 relatively.

[0038] During adjustment, rotate the nut 162 located below the adjusting seat 15 to push the adjusting seat 15 to rotate, causing the belt 142 to be taut. Rotate the nut 162 located above the adjusting seat 15, and the two nuts 162 clamp the adjusting seat 15. The adjusting seat 15 drives the moving part 213 to rotate, and the moving part 213 drives the first connecting bar 221 to slide, which in turn drives the second connecting bar 222 to move upward through the protective net 22, thereby driving the sliding seat 214 to move upward.

[0039] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A slide valve vacuum pump, characterized in that: The system includes a pump body (11), an adjusting seat (15), a drive motor (13), a transmission assembly (14), a main shaft (12), and a spool valve eccentric wheel mechanism. The spool valve eccentric wheel mechanism is located inside the pump body (11). The main shaft (12) is coaxially rotatably connected to the pump body (11) to drive the spool valve eccentric wheel mechanism. The rotation axis of the main shaft (12) is horizontal. One end of the adjusting seat (15) is rotatably connected to the upper end of the pump body (11). The rotation axis of the adjusting seat (15) is parallel to the rotation axis of the main shaft (12). The drive motor (13) is connected to the adjusting seat (15). The transmission assembly (14) includes pulleys (141) and a belt (142). There are two pulleys (141). The two pulleys (141) are coaxially connected to the output shaft of the drive motor (13) and the main shaft (12), respectively. The belt (142) is sleeved on the outer circumference of the two pulleys (141).

2. The slide valve vacuum pump according to claim 1, characterized in that: The pulley (141) has a plurality of V-shaped grooves (1411) on its outer periphery; the plurality of V-shaped grooves (1411) are distributed at intervals along the axis of the pulley (141); the belt body (142) has a plurality of components; the plurality of belt bodies (142) are respectively embedded in the plurality of V-shaped grooves (1411).

3. The slide valve vacuum pump according to claim 2, characterized in that: It also includes an adjustment assembly (16); the adjustment assembly (16) includes a bolt (161) and a nut (162); one end of the bolt (161) is connected to the pump body (11); the length direction of the bolt (161) is vertical; the adjustment seat (15) is provided with an adjustment groove (1511); the other end of the bolt (161) passes through the adjustment groove (1511); the side wall of the bolt (161) is in contact with the groove wall of the adjustment groove (1511); two nuts (162) are provided; the two nuts (162) are symmetrically distributed along the length direction of the bolt (161); the two nuts (162) respectively abut against the two sides of the adjustment seat (15) along the axis of the bolt (161).

4. The slide valve vacuum pump according to claim 3, characterized in that: The adjustment groove (1511) is located on the side of the adjustment seat (15) away from the rotation axis of the adjustment seat (15); there are two adjustment grooves (1511); the two adjustment grooves (1511) are symmetrically distributed along the rotation axis of the adjustment seat (15); the number of adjustment components (16) is the same as the number of adjustment grooves (1511) and they correspond one-to-one.

5. The slide valve vacuum pump according to claim 2, characterized in that: It also includes a protective cover (21); the protective cover (21) is connected to the side of the pump body (11) near the transmission assembly (14), and the protective cover (21) near the side of the pump body (11) has a receiving cavity (211); the transmission assembly (14) is embedded in the receiving cavity (211).

6. The slide valve vacuum pump according to claim 5, characterized in that: It also includes a protective net (22); the protective cover (21) includes a fixed part (212) and a movable part (213); the fixed part (212) is connected to the pump body (11); the movable part (213) is connected to the adjusting seat (15); the two ends of the protective net (22) are respectively connected to the movable part (213) and the fixed part (212).

7. The slide valve vacuum pump according to claim 6, characterized in that: It also includes abutting wheels (23); the abutting wheels (23) are embedded in the receiving cavity (211); the abutting wheels (23) are located on the side of the fixed part (212) near the moving part (213); the rotation axis of the abutting wheels (23) is parallel to the rotation axis of the main shaft (12); the abutting wheels (23) are used to abut against the belt body (142); there are several abutting wheels (23); the several abutting wheels (23) are divided into two groups; the two groups of abutting wheels (23) are symmetrically distributed along the rotation axis perpendicular to the main shaft (12).

8. The slide valve vacuum pump according to claim 6, characterized in that: It also includes a first magnetic strip (24) and a second magnetic strip (25); the protective cover (21) also includes a sliding seat (214); the sliding seat (214) is slidably connected to the outer wall of the fixed part (212); the sliding direction of the sliding seat (214) is vertical; the protective net (22) is connected to a first connecting strip (221) and a second connecting strip (222) at both ends along the vertical direction respectively; the second connecting strip (222) is connected to the sliding seat (214); the first connecting strip (221) is connected to the moving part (213); the first magnetic strip (24) is connected to the side of the first connecting strip (221) near the pump body (11); the second connecting strip (222) is connected to the fixed part (212); the second magnetic strip (25) is connected to the side of the second connecting strip (222) near the pump body (11).

9. The slide valve vacuum pump according to claim 8, characterized in that: The outer wall of the movable part (213) is connected to a mounting base (2131); the first connecting strip (221) abuts against the side surface of the mounting base (2131) away from the sliding seat (214); the side of the mounting base (2131) away from the sliding seat (214) is provided with a first slot (21311); the side of the first connecting strip (221) near the sliding seat (214) is connected to a first locking block (2211); the first locking block (2211) is embedded in the first slot (21311); the second connecting strip (222) abuts against the side surface of the sliding seat (214) away from the mounting base (2131); the side of the sliding seat (214) away from the mounting base (2131) is provided with a second slot (2141); the side of the second connecting strip (222) near the mounting base (2131) is connected to a second locking block (2221); the second locking block (2221) is embedded in the second slot (2141).

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