Multi-shaft linkage type quick dismounting and mounting equipment with torque valve

Abstract

The invention provides multi-shaft linkage type quick dismounting and mounting equipment with a torque valve, and relates to the technical field of valve maintenance. A handle is arranged at the top of the propelling frame, a propelling block is slidably connected to the middle of the interior of the propelling frame, and a bolt rod is rotationally connected to the middle of the rear end of the propelling frame. Through meshing transmission of a transmission gear shaft, a face gear and a rack, the three rack frames synchronously move forwards along a sliding rail and synchronously follow up with backward movement during bolt disassembly, it is ensured that a contact piece is attached to the surface of a valve all the time, stable supporting force is provided for equipment, and overall displacement of the equipment is effectively avoided; according to the synchronous follow-up supporting structure, the acting force generated when equipment is disassembled is transmitted to the valve body through the rack frame instead of acting on a user. The problems that in the bolt dismounting process, the whole bolt moves backwards, and a traditional mode lacks an effective synchronous follow-up mechanism to keep stable contact between equipment and a valve, so that the dismounting stability is affected are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of valve maintenance, and in particular to a multi-axis linkage type torque-carrying valve rapid disassembly and assembly device. Background Art

[0002] As a key component in industrial fluid control systems, torque valves are widely used in high-demand scenarios such as petrochemicals, natural gas transportation, nuclear power, and metallurgy. Their core function is to achieve valve opening and closing, sealing, and pressure regulation through precise control of torque. For example, in high-pressure pipelines, valves need to use precise torque to ensure that the sealing surface is evenly pressurized to prevent medium leakage. In the industrial field, the disassembly and assembly of torque valves is a common and important task. With the continuous improvement of the degree of industrial automation, the requirements for the efficiency, precision, and safety of the disassembly and assembly of torque valves are also getting higher and higher.

[0003] When the cam is in the air, the cam is tightened and the screw thread is tightened, and the cam is tightened to the airtight position where the cam is tightened, and the cam is tightened to the airtight position where the cam is tightened.

[0004] Based on the search of the above patents and the understanding of the application of existing torque valve disassembly and assembly: 1. There is uneven force during manual disassembly, and it is difficult to ensure uniform lateral force, which can easily damage the bolts and the torque valve body; 2. When using handheld disassembly equipment, the force of the equipment is easily transmitted to the user, making it difficult for the user to control the disassembly equipment, and the equipment may shift; 3. During the bolt disassembly process, the bolt moves backward as a whole. The traditional method lacks an effective synchronous follow-up mechanism to maintain stable contact between the equipment and the valve, affecting the stability and reliability of disassembly.

[0005] Therefore, in view of this, the existing structure and defects are studied and improved, and a multi-axis linkage torque valve rapid disassembly and assembly device is provided to achieve a more practical purpose. Summary of the Invention

[0006] In order to solve the above technical problems, the present invention provides a multi-axis linkage torque valve rapid disassembly and assembly device to solve the problem of uneven force during existing manual disassembly and the problem that the force of the handheld disassembly device is easily transmitted to the user himself during disassembly, making it difficult for the user to control the disassembly device and the bolt moves backward as a whole during the bolt disassembly process. The traditional method lacks an effective synchronous follow-up mechanism to maintain stable contact between the device and the valve, affecting the stability of disassembly.

[0007] The present invention provides a multi-axis linkage torque valve quick disassembly and assembly device, which specifically includes: a propulsion frame; a handle is provided at the top position of the propulsion frame, a propulsion block is slidably connected to the middle position of the inner portion of the propulsion frame, a threaded hole is provided at the middle position of the rear end of the propulsion block, a bolt rod is rotatably connected to the middle position of the rear end of the propulsion frame, and the front end of the bolt rod is rotatably connected to the threaded hole of the propulsion block, the left and right sides of the propulsion block are respectively fixedly connected to the left and right sides of the inner rear end of the progressive frame, the progressive frame is located at the front end position of the propulsion frame, and the middle position of the front end of the progressive frame is fixedly connected It is connected to motor A, and the front end rotating shaft of motor A is fixedly connected to the middle position of the rear end of the disassembly frame. Motor A is located in the front position of the disassembly frame. Three slide grooves are provided at the front end of the disassembly frame, and a disassembly claw is slidably connected in each slide groove. The three disassembly claws are distributed in a Y shape, and an arc groove is provided at the rear position of each disassembly claw. The internal position of the disassembly frame is rotatably connected to the transmission gear ring, and a spiral groove is provided at the front end position of the transmission gear ring. The arc grooves of the three disassembly claws all engage with the spiral groove at the front end of the transmission gear ring. Motor B is fixedly installed at the top middle position of the disassembly frame.

[0008] Furthermore, a transmission bevel gear is fixedly installed at the rotating shaft position of the motor B. The transmission bevel gear is located at the upper inner position of the disassembly frame, and the transmission bevel gear is engaged with the upper rear end position of the transmission gear ring.

[0009] Furthermore, a base is provided at the bottom of the propulsion frame, and a Y-shaped mounting seat is fixedly installed at the middle position of the top front end of the base of the propulsion frame. The front end position of the mounting seat is fixedly connected to the lower position of the rear end of the positioning frame. The positioning frame is designed in a circular ring shape, and the positioning frame is located directly in front of the propulsion frame, and the disassembly frame is located at the internal axis position of the positioning frame.

[0010] Furthermore, a frame is fixedly installed at the middle position of the bottom of the positioning frame, a motor C is fixedly installed at the bottom position of the frame, and the top shaft of the motor C is fixedly connected to the middle position of the positioning bevel gear.

[0011] Furthermore, the circumferential position of the positioning frame is fixedly connected to three Y-shaped limit seats, the distance between each two adjacent limit seats is the same, and a positioning gear ring is provided on the outer position of the positioning frame. The edge positions of the positioning gear ring are rotatably connected to the inner positions of the three limit seats, and the lower position of the positioning gear ring is located inside the frame, and the lower position of the front end of the positioning gear ring engages with the rear position of the positioning bevel gear.

[0012] Furthermore, a slide rail is fixedly installed on the outer position of each limit seat, and a rack rack is slidably connected to the inner position of each slide rail. The middle position of the rack rack is hollow, and a rack is provided on the inner position of the rack rack.

[0013] Furthermore, the three rack racks are distributed in a Y shape, and the distance between every two adjacent rack racks is the same. A contact piece is provided at the front end of each rack rack, and a rubber pad is provided at the front end of each contact piece.

[0014] Furthermore, a transmission gear shaft is rotatably connected to the inner middle position of each of the limit seats, a bevel gear is provided on the inner side of each transmission gear shaft, and a plane gear is provided on the outer side of each transmission gear shaft.

[0015] Furthermore, the three bevel gear positions of the transmission gear shaft are all engaged with the positioning gear ring, the outer positions of the three transmission gear shafts are all connected to the inner position of a rack rack, and the plane gears on the outer sides of the three transmission gear shafts are all engaged with the rack position of the rack rack.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. Motor B drives the transmission bevel gear and transmission gear ring, causing the three disassembly claws to move synchronously within the disassembly frame's slide slot, achieving precise clamping of the bolt and ensuring the clamping position is centered, avoiding uneven disassembly force caused by clamping offset. Motor A drives the disassembly frame to rotate as a whole, causing the three disassembly claws to clamp and rotate the bolt with a uniform rotation amplitude. Compared to manual disassembly, this can provide uniform and stable lateral force, effectively avoiding damage to the bolt and torque valve body, and improving the reliability and safety of disassembly.

[0017] 2. The contact pieces at the front ends of the three racks fit into the torque valve surface via rubber pads. During the disassembly process, motor C drives the positioning bevel gear and positioning gear ring. Through the meshing transmission of the transmission gear shaft and the plane gear with the rack, the three racks move forward synchronously along the slide rails, following the backward movement during bolt removal. This ensures that the contact pieces always fit into the valve surface, provides stable support for the equipment, and effectively prevents overall displacement of the equipment. This synchronous follow-up support structure transmits the force during equipment disassembly to the valve body through the rack, rather than acting on the user, greatly reducing the difficulty of operation for the user and making the disassembly process more stable and controllable.

[0018] 3. The bolt rod cooperates with the threaded hole of the push block, and the position of the push block in the push frame can be easily adjusted by rotating the bolt rod, thereby driving the progressive frame to move back and forth and adjusting the spacing between the progressive frame and the mounting base. This design can adapt to torque valves of different specifications and installation positions, improving the versatility and applicability of the equipment. There is no need to replace special equipment for different valves, reducing the cost of use and operational complexity.

[0019] Through the coordinated work of motors A, B, and C, the equipment realizes the multi-linkage of the clamping action of the disassembly claw, the rotational disassembly action of the disassembly frame, and the synchronous follow-up support action of the rack frame. The transmission relationship between each component is closely coordinated, and the bolt disassembly process can be completed quickly and efficiently. Compared with traditional manual disassembly or single power disassembly methods, it significantly improves work efficiency and shortens disassembly time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments are briefly introduced below.

[0021] In the attached figure: Figure 1 It shows a left-side structural schematic diagram of a multi-axis linkage torque valve rapid disassembly and assembly device according to an embodiment of the present invention; Figure 2 A schematic side view of a multi-axis linkage torque valve rapid disassembly and assembly device according to an embodiment of the present invention is shown; Figure 3 It shows a schematic diagram of a half-section left side structure of the assembly of the propulsion frame and the progressive frame according to an embodiment of the present invention; Figure 4 It shows a schematic diagram of a half-section side view of the assembly structure of the propulsion frame and the progressive frame according to an embodiment of the present invention; Figure 5 The embodiment according to the present invention is shown Figure 4 A schematic diagram of the partially enlarged structure at center A; Figure 6 A schematic diagram of a half-section front view of the overall structure of a mounting base according to an embodiment of the present invention is shown; Figure 7 A schematic diagram of a half-section top view of the overall structure of a mounting base according to an embodiment of the present invention is shown; Figure 8 A schematic diagram of a half-section side view of the overall structure of the mounting base according to an embodiment of the present invention is shown.

[0022] Reference Signs List 1. Propelling frame; 101. Handle; 102. Propelling block; 103. Bolt rod; 2. Progressive frame; 201. Motor A; 202. Disassembly frame; 203. Transmission gear ring; 204. Motor B; 205. Transmission bevel gear; 206. Disassembly claw; 3. Mounting seat; 301. Positioning frame; 302. Frame; 303. Motor C; 304. Positioning bevel gear; 305. Limiting seat; 306. Positioning gear ring; 307. Transmission gear shaft; 308. Slide rail; 309. Rack frame; 310. Contact piece. DETAILED DESCRIPTION

[0023] The following will be combined with the accompanying drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the embodiments described are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present disclosure.

[0024] Unless otherwise defined, all terms (including technical and scientific terms) used in the embodiments of the present disclosure have the same meaning as commonly understood by those skilled in the art to which the present disclosure belongs. It should also be understood that terms such as those defined in common dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or highly formal sense, unless explicitly defined in this manner in the embodiments of the present disclosure.

[0025] The terms "first", "second" and similar terms used in the embodiments of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. The terms "one", "an" or "the" and similar terms do not indicate a quantitative limitation, but rather indicate the presence of at least one. Similarly, the terms "include" or "comprise" and similar terms mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. In the following description, spatial and directional terms such as "upper", "lower", "front", "back", "top", "bottom", "vertical" and "horizontal" may be used to describe the embodiments of the present disclosure, but it should be understood that these terms are only for the convenience of describing the embodiments shown in the figures and do not require the actual device to be constructed or operated in a specific orientation. In the following description, the use of terms such as "connect", "couple", "fixed" and "attached" may refer to a direct connection between two elements or structures without other elements or structures between them, or may refer to an indirect connection between two elements or structures through an intermediate element or structure, unless otherwise expressly stated herein. Example

[0026] As attached Figure 1 To the attached Figure 8 As shown: The present invention provides a multi-axis linkage torque valve quick disassembly and assembly device, comprising: a propulsion frame 1; a handle 101 is provided at the top position of the propulsion frame 1, a propulsion block 102 is slidably connected to the inner middle position of the propulsion frame 1, a threaded hole is provided at the rear middle position of the propulsion block 102, a bolt rod 103 is rotatably connected to the rear middle position of the propulsion frame 1, the front end position of the bolt rod 103 is rotatably connected to the threaded hole of the propulsion block 102, the left and right sides of the propulsion block 102 are respectively fixedly connected to the left and right sides of the inner rear end of the progressive frame 2, the progressive frame 2 is located at the front end position of the propulsion frame 1, and the front middle position of the progressive frame 2 is fixedly connected to the motor A201, the motor A The front end rotating shaft of 201 is fixedly connected to the middle position of the rear end of the disassembly frame 202. The motor A201 is located in the front of the disassembly frame 202. Three slide grooves are provided at the front end of the disassembly frame 202, and a disassembly claw 206 is slidably connected in each slide groove. The three disassembly claws 206 are distributed in a Y shape, and an arc groove is provided at the rear position of each disassembly claw 206. The internal position of the disassembly frame 202 is rotatably connected to the transmission gear ring 203. A spiral groove is provided at the front end position of the transmission gear ring 203. The arc groove positions of the three disassembly claws 206 all engage with the spiral groove at the front end of the transmission gear ring 203. The motor B204 is fixedly installed at the top middle position of the disassembly frame 202.

[0027] The transmission bevel gear 205 is fixedly installed on the rotating shaft of the motor B204 . The transmission bevel gear 205 is located at the upper inner portion of the disassembly frame 202 , and the transmission bevel gear 205 engages with the upper rear end of the transmission gear ring 203 .

[0028] Among them, a base is provided at the bottom of the propulsion frame 1, and a Y-shaped mounting seat 3 is fixedly installed at the middle position of the top front end of the base of the propulsion frame 1. The front end position of the mounting seat 3 is fixedly connected to the lower position of the rear end of the positioning frame 301. The positioning frame 301 is designed in a circular shape, and the positioning frame 301 is located directly in front of the propulsion frame 1, and the disassembly frame 202 is located at the internal axis position of the positioning frame 301.

[0029] The bottom middle position of the positioning frame 301 is fixedly mounted with a frame 302 , the bottom position of the frame 302 is fixedly mounted with a motor C303 , and the top shaft of the motor C303 is fixedly connected to the middle position of the positioning bevel gear 304 .

[0030] Among them, the circumferential position of the positioning frame 301 is also fixedly connected with three Y-shaped limit seats 305, and the distance between each two adjacent limit seats 305 is the same. A positioning gear ring 306 is provided at the outer position of the positioning frame 301. The edge positions of the positioning gear ring 306 are rotatably connected to the internal positions of the three limit seats 305, and the lower position of the positioning gear ring 306 is located inside the frame 302, and the lower position of the front end of the positioning gear ring 306 engages with the rear position of the positioning bevel gear 304.

[0031] Among them, a slide rail 308 is fixedly installed at the outer position of each limit seat 305, and a rack frame 309 is slidably connected to the inner position of each slide rail 308. The middle position of the rack frame 309 is hollow, and a rack is set at the inner position of the rack frame 309.

[0032] The three rack racks 309 are arranged in a Y shape, and the distance between every two adjacent rack racks 309 is the same. A contact piece 310 is provided at the front end of each rack rack 309 , and a rubber pad is provided at the front end of each contact piece 310 .

[0033] Among them, the inner middle position of each limit seat 305 is rotatably connected to a transmission gear shaft 307, the inner position of each transmission gear shaft 307 is provided with a bevel gear, and the outer position of each transmission gear shaft 307 is provided with a plane gear.

[0034] Among them, the three bevel gear positions of the transmission gear shaft 307 are all engaged with the positioning gear ring 306, the outer positions of the three transmission gear shafts 307 are all connected to the inner position of a rack rack 309, and the flat gears on the outer sides of the three transmission gear shafts 307 are all engaged with the rack position of the rack rack 309.

[0035] When using: Before using this device, the motor B204 drives the transmission bevel gear 205 to rotate, so that the transmission gear ring 203 drives the disassembly claw 206 to move to the outermost position of the disassembly frame 202 slide slot, ensuring that the disassembly claw 206 is at the maximum extension distance; When it is necessary to disassemble the multi-axis linkage torque valve, the equipment is moved to the valve position to be disassembled by using the handle 101 on the top of the push frame 1, ensuring that the center of the ring of the disassembly frame 202 is aligned with the bolt position of the valve to be disassembled, and then the contact pieces 310 set at the front ends of the three rack frames 309 are fitted to the surface position of the torque valve, and the position of the disassembled bolt is ensured to be in the middle position of the three contact pieces 310, and the bolt rod 103 is rotated. Through the cooperation between the bolt rod 103 and the threaded hole of the push block 102, the push block 102 is moved forward in the internal position of the push frame 1, and the push block 102 drives the progressive frame 2 to move forward until the position of the disassembled bolt is located in the middle of the three disassembly claws 206. The intermediate position is reached, and then the motor B204 is controlled to reverse and drive the transmission bevel gear 205 to rotate in the opposite direction, so that the transmission gear ring 203 drives the three disassembly claws 206 to slide inward in the slide groove of the disassembly frame 202 until the inner positions of the three disassembly claws 206 contact the outer peripheral position of the bolt to be disassembled, and the motor A201 is started. The rotating shaft of the motor A201 drives the disassembly frame 202 to rotate as a whole, and the three disassembly claws 206 on the circumference of the disassembly frame 202 rotate according to the rotation amplitude of the disassembly frame 202, clamping and rotating the disassembled bolts for disassembly, so as to avoid uneven force and the inability to ensure uniform lateral force during manual disassembly, which may damage the bolts and the main body of the torque valve.

[0036] Since the bolts are bolted to the torque valve installation position, the whole moves to the rear position during the bolt removal process, and the motor C303 is started. The shaft of the motor C303 will drive the positioning bevel gear 304 to rotate. Through the meshing transmission of the positioning bevel gear 304 and the positioning gear ring 306, the positioning gear ring 306 rotates in the internal position of the three limit seats 305. While the positioning gear ring 306 rotates, the positioning gear ring 306 drives the three transmission gear shafts 307 to rotate synchronously through the meshing bevel gear on the inner side of the transmission gear shaft 307. At this time, the flat gears on the outer sides of the three transmission gear shafts 307 are The face gear meshes with the rack of the rack frame 309 to transmit the three rack frames 309 to move forward synchronously along the slide rail 308, controlling the rotation of the motor C303 and the motor A201 to ensure that the sliding distance of the rotated and backward bolts is consistent with the slide rail 308 inside the rack frame 309, so that when the three disassembly claws 206 disassemble the bolts, the three contact pieces 310 at the front end of the rack frame 309 moderately contact the surface position of the torque valve, avoiding the overall displacement of the equipment and avoiding the situation where the equipment force is transmitted to the user himself during disassembly with the current handheld disassembly equipment, making it difficult for the user to control the disassembly equipment.

[0037] In addition, the bolt rod 103 cooperates with the threaded hole of the propulsion block 102, and the propulsion block 102 can drive the distance between the progressive frame 2 and the propulsion frame 1 to be adjusted, thereby adjusting the distance between the progressive frame 2 as a whole and the mounting seat 3 as a whole.

[0038] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. The protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A multi-axis linkage torque valve rapid disassembly and assembly device, characterized in that: include: The propulsion frame (1) is provided with a handle (101) at the top position of the propulsion frame (1), a propulsion block (102) is slidably connected to the middle position of the inner portion of the propulsion frame (1), a threaded hole is provided at the middle position of the rear end of the propulsion block (102), a bolt rod (103) is rotatably connected to the middle position of the rear end of the propulsion frame (1), the front end of the bolt rod (103) is rotatably connected to the threaded hole of the propulsion block (102), the left and right sides of the propulsion block (102) are respectively fixedly connected to the left and right sides of the inner rear end of the progressive frame (2), the progressive frame (2) is located at the front end position of the propulsion frame (1), the front end middle position of the progressive frame (2) is fixedly connected to the motor A (201), the front end shaft of the motor A (201) is connected to the disassembly The middle position of the rear end of the disassembly frame (202) is fixedly connected, the motor A (201) is located in the front position of the disassembly frame (202), the front position of the disassembly frame (202) is provided with three slide grooves, and a disassembly claw (206) is slidably connected in each slide groove, the three disassembly claws (206) are distributed in a Y shape, and the rear position of each disassembly claw (206) is provided with an arc groove, the internal position of the disassembly frame (202) is rotatably connected with the transmission gear ring (203), the front position of the transmission gear ring (203) is provided with a spiral groove, the arc groove positions of the three disassembly claws (206) are all engaged with the spiral groove at the front end of the transmission gear ring (203), and the motor B (204) is fixedly installed at the middle position of the top of the disassembly frame (202).

2. The multi-axis linkage torque valve rapid disassembly and assembly device according to claim 1, characterized in that: A transmission bevel gear (205) is fixedly mounted on the rotating shaft of the motor B (204). The transmission bevel gear (205) is located at an upper position inside the disassembly frame (202), and the transmission bevel gear (205) engages with an upper position at the rear end of the transmission gear ring (203).

3. The multi-axis linkage torque valve rapid disassembly and assembly device according to claim 1, characterized in that: The bottom of the propulsion frame (1) is provided with a base, and a Y-shaped mounting seat (3) is fixedly installed at the middle position of the front end of the top of the base of the propulsion frame (1), and the front end position of the mounting seat (3) is fixedly connected to the lower position of the rear end of the positioning frame (301). The positioning frame (301) is designed in a circular ring shape, and the positioning frame (301) is located in the front position of the propulsion frame (1), and the disassembly frame (202) is located at the internal axis position of the positioning frame (301).

4. The multi-axis linkage torque valve rapid disassembly and assembly device according to claim 3, characterized in that: A frame (302) is fixedly mounted at the middle position of the bottom of the positioning frame (301), a motor C (303) is fixedly mounted at the bottom position of the frame (302), and a top rotating shaft of the motor C (303) is fixedly connected to the middle position of the positioning bevel gear (304).

5. The multi-axis linkage torque valve rapid disassembly and assembly device according to claim 4, characterized in that: The circumferential surface of the positioning frame (301) is further fixedly connected to three Y-shaped limiting seats (305), the spacing between each two adjacent limiting seats (305) being the same, a positioning gear ring (306) is provided at the outer position of the positioning frame (301), the edge positions of the positioning gear ring (306) are all rotatably connected to the inner positions of the three limiting seats (305), and the lower position of the positioning gear ring (306) is located inside the frame (302), and the lower position of the front end of the positioning gear ring (306) is engaged with the rear position of the positioning bevel gear (304).

6. The multi-axis linkage torque valve rapid disassembly and assembly device according to claim 2, characterized in that: A slide rail (308) is fixedly installed at the outer position of each limit seat (305), and a rack frame (309) is slidably connected to the inner position of each slide rail (308). The middle position of the rack frame (309) is hollow, and a rack is provided at the inner position of the rack frame (309).

7. The multi-axis linkage torque valve rapid disassembly and assembly device according to claim 6, characterized in that: The three rack racks (309) are distributed in a Y shape, and the spacing between each two adjacent rack racks (309) is the same. A contact piece (310) is provided at the front end of each rack rack (309), and a rubber pad is provided at the front end of each contact piece (310).

8. The multi-axis linkage torque valve rapid disassembly and assembly device according to claim 6, characterized in that: The inner middle position of each limiting seat (305) is rotatably connected to a transmission gear shaft (307), the inner side position of each transmission gear shaft (307) is provided with a bevel gear, and the outer side position of each transmission gear shaft (307) is provided with a plane gear.

9. The multi-axis linkage torque valve rapid disassembly and assembly device according to claim 8, characterized in that: The three bevel gear positions of the transmission gear shaft (307) are all engaged with the positioning gear ring (306), the outer positions of the three transmission gear shafts (307) are all connected to the inner position of a rack frame (309), and the plane gears on the outer sides of the three transmission gear shafts (307) are all engaged with the rack positions of the rack frame (309).

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