Supporting device for material rack and warehousing system

Abstract

The utility model provides a supporting device for a material rack and a warehousing system, and relates to the field of automation equipment, the supporting device comprises a base, a supporting shaft assembly, a supporting piece and a first adjusting mechanism; the base is provided with a mounting position connected with a material rack base, the supporting shaft assembly is connected with the base through a first adjusting mechanism, the supporting piece can rotate relative to the supporting shaft assembly, and the supporting piece is used for bearing a material rack; the first adjusting mechanism can make the supporting shaft assembly move up and down relative to the base so as to adjust the height of the supporting piece relative to the base. The vertical height of the supporting shaft assembly is finely adjusted through the first adjusting mechanism, the levelness of the supporting piece is accurately calibrated, it is ensured that the rack moves stably, and the damage risk of raw glass sheets is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automation equipment, in particular to a support device for a rack and a storage system. BACKGROUND

[0002] In a glass deep processing automation line, a raw sheet storage system is an indispensable link. The raw sheet storage system includes a shuttle raw sheet storage system. The shuttle raw sheet storage system includes a storage cart, a rack, and a rack chassis, etc. The rack is used to store glass raw sheets. The storage cart will pull the specified rack to the cart rack chassis according to the task requirements, and then send it to the sheet loading position to prepare for the next process.

[0003] The existing storage rack support device is directly fixed on the rack chassis welded profile. Due to the poor flatness of the profile surface and the welding deformation, the surface of the support is uneven, which needs to be adjusted by adding shims, which is inconvenient to operate, reduces the transmission efficiency of the glass raw sheet, and further causes the glass raw sheet to be easily damaged during transmission. CONTENT OF THE UTILITY MODEL

[0004] The purpose of the present application is to solve at least one of the above existing technical problems, and to provide a support device for a rack. The first adjusting mechanism can adjust the height of the support, thereby compensating for the effects of manufacturing or installation errors, and improving the transmission efficiency of the rack.

[0005] The present application provides a support device for a rack, comprising a base, a support shaft assembly, a support, and a first adjusting mechanism.

[0006] The base is provided with a mounting position connected with the rack base. The support shaft assembly is connected with the base through the first adjusting mechanism. The support can rotate relative to the support shaft assembly, and the support is used to support the rack.

[0007] The first adjusting mechanism can move the support shaft assembly up and down relative to the base to adjust the height of the support relative to the base.

[0008] In a possible implementation, the support includes a first support wheel and a second support wheel, and the first adjusting mechanism includes a first adjusting member and a second adjusting member.

[0009] The support shaft assembly has a first end and a second end. The first support wheel is rotatably connected with the first end, and the second support wheel is rotatably connected with the second end. The first adjusting member is arranged on one side of the support shaft assembly close to the first support wheel, and the second adjusting member is arranged on one side of the support shaft assembly close to the second support wheel.

[0010] In a possible implementation, the support device further comprises a guide assembly arranged on the base, the shelf is configured to contact the guide assembly, and the guide assembly is configured to generate a rotational friction force relative to the shelf, and the rotational friction force is configured to align the shelf with the support.

[0011] In a possible implementation, the support device further comprises a second adjusting mechanism, the guide assembly comprises a first guide wheel and a second guide wheel, the first guide wheel and the second guide wheel have a first distance, and the second adjusting mechanism is configured to adjust the first distance.

[0012] In a possible implementation, the first guide wheel and the second guide wheel are symmetrically arranged about a center line of the base.

[0013] In a possible implementation, the guide assembly comprises a mounting plate, the mounting plate is provided with a first mounting hole and a second mounting hole;

[0014] The first guide wheel is fixedly connected with the mounting plate through the first mounting hole, and the second guide wheel is fixedly connected with the mounting plate through the second mounting hole.

[0015] In a possible implementation, the base is provided with a support shaft connecting hole, the base is fixedly connected with the support shaft assembly by assembling a fastener in the support shaft connecting hole, and the support shaft connecting hole is a waist-shaped hole.

[0016] In a possible implementation, the base is provided with a base connecting hole, the base is fixedly connected with the shelf base by assembling a fastener in the base connecting hole.

[0017] In a possible implementation, the support is provided with a wear-resistant coating.

[0018] In another aspect, the application further provides a storage system comprising the support device according to any one of the above embodiments, and further comprising a shelf and a shelf base.

[0019] A plurality of support devices are fixedly connected with the shelf base, and the support devices are configured to contact the shelf to guide the shelf to move relative to the shelf base.

[0020] The support device for the shelf provided by the application has the following beneficial effects:

[0021] The application provides a support device for a rack, which comprises a base, a support shaft assembly, a support piece and a first adjusting mechanism; the base is provided with a mounting position connected with a rack base, the support shaft assembly is connected with the base through the first adjusting mechanism, the support piece can rotate relative to the support shaft assembly, and the support piece is used for supporting the rack; and the first adjusting mechanism can move the support shaft assembly up and down relative to the base to adjust the height of the support piece relative to the base. The vertical height of the support shaft assembly is finely adjusted through the first adjusting mechanism, the horizontal degree of the support piece is accurately calibrated, the rack is ensured to move stably, and the risk of breakage of a glass wafer is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0023] Figure 1 is a structural schematic view of the support device in the embodiment of the present application;

[0024] Figure 2 is a front view of the support device in the embodiment of the present application;

[0025] Figure 3 is a structural schematic view of the rack base plate in the embodiment of the present application;

[0026] Figure 4 is a structural schematic view of the rack in the embodiment of the present application;

[0027] Figure 5 is a front view of the rack in the embodiment of the present application.

[0028] The following is a supplementary description of the drawings:

[0029] 1, base; 2, support shaft assembly; 3, support piece; 4, first adjusting mechanism; 5, guide assembly; 51, first guide wheel; 52, second guide wheel; 7, second adjusting mechanism; 8, rack base; 9, rack. DETAILED DESCRIPTION

[0030] The technical scheme in the embodiments of the present application will be described clearly and completely in combination with the drawings. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0031] The term "one embodiment" or "an embodiment" as may appear in the specification is intended to mean a particular feature, structure, or characteristic described herein. In the description of embodiments, when it is said that a feature, structure, or characteristic "may" be included, it means that the feature, structure, or characteristic is optionally included or can be included in at least one implementation of the present disclosure. In the description of embodiments, the terms "upper", "lower", "top", "bottom", and the like refer to the orientation or positional relationship as shown in the drawings, and are used only to facilitate the description of the present disclosure and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0032] The support device for the rack provided by the embodiments of the present disclosure is particularly suitable for the scenario of transporting glass raw sheets.

[0033] Referring to Figures 1-5 , the present disclosure provides a support device for a rack 9, which comprises a base 1, a support shaft assembly 2, a support piece 3, and a first adjusting mechanism 4. The base 1 is provided with a mounting position connected with a rack base 8. The support shaft assembly 2 is connected with the base 1 through the first adjusting mechanism 4. The support piece 3 can rotate relative to the support shaft assembly 2, and the support piece 3 is used for supporting the rack 9. The first adjusting mechanism 4 can move the support shaft assembly 2 up and down relative to the base 1 to adjust the height of the support piece 3 relative to the base 1. The vertical height of the support shaft assembly 2 is fine-tuned through the first adjusting mechanism 4, and the levelness of the support piece 3 is accurately calibrated, so as to ensure the smooth movement of the rack 9 and avoid the risk of damage to the glass raw sheet.

[0034] It can be understood that in the automatic connection line of glass deep processing, raw sheet storage is an indispensable link, among which the most common one is shuttle raw sheet storage. The system mainly comprises a storage cart, a rack 9, and a rack 9 chassis and the like. The rack 9 is used for storing glass raw sheets and is placed on the support piece 3 of the rack 9 chassis. The storage cart pulls the specified rack 9 to the rack 9 chassis of the cart according to the task requirement, and transports it to the sheet placing position, so as to prepare for the next process. In order to ensure the smooth movement of the rack 9 during movement, it is necessary to ensure the flatness of the surface of the support wheel on the rack 9 chassis, and at the same time, the spacing of the guide wheels on both sides should be reasonably controlled. The existing support device of the storage rack 9 is directly fixed on the rack 9 chassis welded profile, and due to the poor flatness of the profile surface and the welding deformation, the surface of the support piece 3 is uneven, which needs to be adjusted by adding shims, which is extremely inconvenient.

[0035] Specifically, as Figure 5 shown, the angle between the plane where the glass raw sheet is located and the plane where the rack 9 is located is less than 90 degrees, so as to prevent the glass raw sheet from sliding off the rack 9.

[0036] Specifically, the base 1 is used to connect with the shelf base 8 to fix the support device with the shelf base 8, the first adjusting mechanism 4 is a screw adjusting mechanism, the support wheel is connected with the base 1 through the support shaft assembly 2, the support wheel can rotate relative to the support shaft assembly 2, the support piece 3 is used to support the shelf 9, the shelf 9 can slide on the support pieces 3 of the plurality of support devices to generate a relative displacement, the first adjusting mechanism 4 can move the support shaft assembly 2 up and down relative to the base 1 to adjust the height of the support wheel relative to the base 1, and the first adjusting mechanism 4 can also adjust the inclination angle of the support wheel relative to the base 1 to adjust the flatness of the base 1.

[0037] In one embodiment, the support piece 3 includes a first support wheel and a second support wheel, and the first adjusting mechanism 4 includes a first adjusting member and a second adjusting member; the support shaft assembly 2 has a first end and a second end, the first support wheel is rotatably connected with the first end, and the second support wheel is rotatably connected with the second end; the first adjusting member is arranged on one side of the support shaft assembly 2 close to the first support wheel, and the second adjusting member is arranged on the other side of the support shaft assembly 2 close to the second support wheel. The first adjusting mechanism 4 adjusts the positions of the first support wheel and the second support wheel through the cooperation of the first adjusting member and the second adjusting member, corrects the manufacturing and installation errors, makes the working state of the support wheel more accurate, and reduces the shaking or deviation of the glass plate during conveying.

[0038] Specifically, the first adjusting member and the second adjusting member both adopt screw adjusting mechanisms, and the rotation of the screw can change the positions of the support wheels to realize fine adjustment of the first support wheel and / or the second support wheel. For example, the first adjusting member is adjusted to lower the height of the first support wheel relative to the base 1, and the first adjusting member is adjusted to raise the height of the second support wheel relative to the base 1.

[0039] In one embodiment, an electric or pneumatic actuator is used to drive the adjusting member through a motor or a pneumatic cylinder, so that each support wheel can be automatically adjusted to a target position to improve the adjustment accuracy and efficiency.

[0040] Further, the support device further includes a guide assembly 5 arranged on the base 1, and the shelf 9 contacts the guide assembly 5 to generate a rotating friction force between the guide assembly 5 and the shelf 9, so that the guide assembly 5 guides the shelf 9 to be aligned with the support piece 3. The guide assembly 5 guides the shelf 9 to be aligned with the support piece 3 through the rotating friction force, reduces human or mechanical errors, improves the alignment accuracy of the shelf 9 and the support device, and ensures that the shelf 9 is stably placed.

[0041] Specifically, the guide assembly 5 is installed on the base 1, and when the shelf 9 contacts the guide assembly 5, the guide assembly 5 rotates and generates a friction force, so that the shelf 9 can be adjusted to a preset position of the support piece 3.

[0042] Further, the support device further comprises a second adjusting mechanism 7, the guide assembly 5 comprises a first guide wheel 51 and a second guide wheel 52, the first guide wheel 51 and the second guide wheel 52 have a first distance, and the second adjusting mechanism 7 is used for adjusting the first distance. By adjusting the first distance of the first guide wheel 51 and the second guide wheel 52, the support device can adapt to racks 9 of different sizes, improve the versatility of the support device, the second adjusting mechanism 7 can dynamically adjust the guide wheel distance, so that the rack 9 is more accurately positioned on the support 3 during movement, reduces errors, and also effectively reduces the shaking of the rack 9 during movement or positioning, improves operation stability.

[0043] Specifically, screws are installed on the base 1, the first guide wheel 51 can be moved by rotating the first adjusting screw, the second guide wheel 52 can be moved by rotating the second adjusting screw, the distance between the first guide wheel 51 and the second guide wheel 52 can be adjusted, and when the first distance meets the target range, the second adjusting mechanism 7 is tightened to fix the first distance, and then the rack 9 is matched with the guide assembly 5.

[0044] It can be understood that the distance between the guide wheels of some support devices is not adjustable, and the rack 9 is a welded part, and the welding error of the distance between the two sides will cause some racks 9 to be not smooth when entering the rack base 8, and collision will occur.

[0045] In one embodiment, the first guide wheel 51 and the second guide wheel 52 are symmetrically arranged about the center line of the base 1. In this way, the symmetric arrangement of the first guide wheel 51 and the second guide wheel 52 about the base 1 can effectively share the load, so that the support 3 is more stable during movement, and the uneven force on any side is reduced, avoiding instability caused by uneven load.

[0046] Specifically, the rack 9 can be clamped with the first guide wheel 51 and the second guide wheel 52, and the maximum distance between the first guide wheel 51 and the second guide wheel 52 is less than or equal to the relative distance of the clamping part of the rack 9.

[0047] In another possible implementation, the first guide wheel 51 and the second guide wheel 52 adopt an eccentric wheel structure, and when the first guide wheel 51 and the second guide wheel 52 contact the rack 9, the eccentric wheel is rotated to provide a progressive guide friction force, so that the rack 9 is more accurately positioned.

[0048] Specifically, the first guide wheel 51 and the second guide wheel 52 are made of high-carbon steel or stainless steel to ensure that the guide wheels have sufficient strength and wear resistance.

[0049] Further, the guide assembly 5 comprises a mounting plate, the mounting plate is provided with a first mounting hole and a second mounting hole; the first guide wheel 51 is fixedly connected with the mounting plate through the first mounting hole, and the second guide wheel 52 is fixedly connected with the mounting plate through the second mounting hole. By opening the mounting hole on the mounting plate, the accurate position and stability of the guide wheel can be ensured, the guiding precision is improved, the components can be quickly disassembled and replaced, and the maintenance time and cost are reduced.

[0050] Specifically, the mounting plate is fixedly connected with the support shaft assembly 2, the first mounting hole and the second mounting hole are both waist-shaped holes, and the first mounting hole and the second mounting hole can provide an adjusting space so that the distance between the first guide wheel 51 and the second guide wheel 52 can be changed.

[0051] In one embodiment, a rubber gasket or other cushioning material is arranged in the first mounting hole and the second mounting hole to provide a cushioning contact surface, so as to slow down the impact force and vibration of the rack 9 and ensure the stable work of the first guide wheel 51 and the second guide wheel 52.

[0052] Specifically, the base 1 is provided with a support shaft connecting hole, the base 1 is fixedly connected with the support shaft assembly 2 by assembling a fastener in the support shaft connecting hole, and the support shaft connecting hole is a waist-shaped hole. In this way, the waist-shaped hole enables the support shaft assembly 2 to adjust the height relative to the base 1, thereby ensuring the accurate butt joint and stable connection between the support shaft assembly 2 and the base 1.

[0053] Specifically, a plurality of support shaft connecting holes are arranged, the base 1 is provided with a first connecting hole matched with the support shaft connecting hole, the first connecting hole can be matched with the support shaft connecting hole, and a fastener is assembled in the support shaft connecting hole and the first connecting hole to fixedly connect the base 1 and the support shaft assembly 2.

[0054] Specifically, the fastener can slide on the support shaft connecting hole, and then the fastener drives the support shaft assembly 2 to move up and down to adjust the height of the support shaft assembly 2 relative to the base 1.

[0055] Specifically, the base 1 is provided with a base connecting hole, the base 1 is fixedly connected with the rack base 8 by assembling a fastener in the base connecting hole. In this way, the base connecting hole can firmly connect the contact surface between the base 1 and the rack base 8, enhance the overall stability of the equipment, and the base connecting hole can be adjusted according to different sizes and specifications of the equipment, thereby enhancing the universality and adaptability of the support device.

[0056] Specifically, a plurality of base connecting holes are arranged, the rack base 8 is provided with a base connecting hole matched with the base connecting hole, the base connecting hole can be matched with the base connecting hole, and a fastener is assembled in the base connecting hole and the base connecting hole to fixedly connect the base 1 and the rack base 8.

[0057] In one embodiment, the support 3 is provided with a wear-resistant coating. In this way, the wear-resistant coating can significantly increase the hardness of the surface of the support 3, so that the support 3 can better resist friction and wear in long-term use, prolong the service life of the support device, and reduce the replacement frequency.

[0058] Optionally, the wear-resistant coating is a tungsten carbide (WC) coating, a diamond-like carbon (DLC) coating, a polyurethane (PU) elastic coating, or a nickel-based alloy coating.

[0059] In one embodiment, a warehouse system is provided, including the support device of any of the above embodiments, and further including a rack 9 and a rack base 8; a plurality of support devices are fixedly connected with the rack base 8, and the support devices are used to contact the rack 9 to guide the rack 9 to move relative to the rack base 8. By guiding the rack 9 to move relative to the base through the support device to reduce friction and resistance, the rack 9 can move smoothly and smoothly in the warehouse system, and the support device can help guide the rack 9 to be stably and accurately positioned and moved, which is suitable for cooperating with an automated control system to improve the efficiency and accuracy of the warehouse.

[0060] Specifically, the warehouse system includes the rack 9, and the support devices are arranged on the rack base 8, and the number of the support devices is greater than or equal to the number of the rack 9, and the heights of the support wheels corresponding to the plurality of support devices are consistent, so that the rack 9 can move smoothly on the support devices to improve the transmission efficiency.

[0061] The working process of the support device in the embodiment of the application is described below in combination with a specific application scenario, and specifically as follows:

[0062] First, fix the base 1 on the rack base 8, loosen the connecting screw of the base 1 and the support wheel shaft assembly, rotate the first adjusting mechanism 4, and move the support wheel shaft assembly up and down to calibrate the surfaces of the first support wheel and the second support wheel to be flat, and lock the connecting screw;

[0063] Then, adjust the second adjusting mechanism 7, slide the first guide wheel 51 and the second guide wheel 52 to the first distance target distance, and cooperate the rack 9 with the support device through the guidance of the guide assembly 5;

[0064] Finally, start the warehouse cart, pull the rack 9 on the surfaces of the support wheels through the traction device to transport the glass raw sheet.

[0065] The specific embodiments of the application are described below based on the above technical solutions.

[0066] Embodiment 1

[0067] Referring to Figures 1-2This embodiment provides a support device for a material rack 9. The support device includes: a base 1, a support shaft assembly 2, a support member 3, and a first adjustment mechanism 4. The base 1 is provided with a mounting position for connection to the material rack base 8. The support shaft assembly 2 is connected to the base 1 through the first adjustment mechanism 4. The support member 3 is rotatable relative to the support shaft assembly 2 and is used to support the material rack 9. The first adjustment mechanism 4 enables the support shaft assembly 2 to move up and down relative to the base 1 to adjust the height of the support member 3 relative to the base 1. The support member 3 includes a first support wheel and a second support wheel. The first adjustment mechanism 4 includes a first adjustment member and a second adjustment member. The support shaft assembly 2 has a first end and a second end. The first support wheel is rotatably connected to the first end, and the second support wheel is rotatably connected to the second end. The first adjustment member is disposed on the side of the support shaft assembly 2 near the first support wheel, and the second adjustment member is disposed on the side of the support shaft assembly 2 near the second support wheel.

[0068] The support device also includes a guide assembly 5, which is mounted on the base 1. The material rack 9 contacts the guide assembly 5, causing rotational friction between them. This rotational friction aligns the material rack 9 with the support member 3. The support device also includes a second adjustment mechanism 7. The guide assembly 5 includes a first guide wheel 51 and a second guide wheel 52, which are spaced a first distance apart. The second adjustment mechanism 7 is used to adjust this first distance. Both the first and second adjustment components employ screw adjustment mechanisms.

[0069] The guide assembly 5 includes a mounting plate with a first mounting hole and a second mounting hole. A first guide wheel 51 is fixedly connected to the mounting plate through the first mounting hole, and a second guide wheel 52 is fixedly connected to the mounting plate through the second mounting hole. The mounting plate is fixedly connected to the support shaft assembly 2. Both the first and second mounting holes are oblong holes. The base 1 is provided with a support shaft connection hole, through which fasteners are assembled. The base 1 is fixedly connected to the support shaft assembly 2. The support shaft connection hole is oblong. The base 1 is provided with a base connection hole, through which fasteners are assembled. The base 1 is fixedly connected to the material rack base 8.

[0070] Example 2

[0071] like Figures 3-5 As shown, this embodiment provides a storage system, including the support device of any of the above embodiments, and further including a rack 9 and a rack base 8; multiple support devices are fixedly connected to the rack base 8, and the support devices are used to contact the rack 9 to guide the rack 9 to move relative to the rack base 8. The support devices are arranged on the rack base 8, and the number of support devices is greater than or equal to the number of racks 9. The support wheels corresponding to the multiple support devices are at the same height, so that the rack 9 can move smoothly on the support devices and improve the transmission efficiency.

[0072] The above only discloses several preferred embodiments of the utility model, and cannot be used to limit the utility model right scope, therefore, equivalent changes made according to the utility model right claim still belong to the range covered by the utility model.

Claims

1. A support device for a shelving unit, characterized in that, The support device comprises a base (1), a support shaft assembly (2), a support piece (3) and a first adjusting mechanism (4); The base (1) is provided with a mounting position connected with a rack base (8), the support shaft assembly (2) is connected with the base (1) through the first adjusting mechanism (4), the support piece (3) can rotate relative to the support shaft assembly (2), and the support piece (3) is used for supporting a rack (9). The first adjusting mechanism can move the support shaft assembly (2) up and down relative to the base (1) to adjust the height of the support piece (3) relative to the base (1).

2. The support device of claim 1, wherein The support piece (3) comprises a first support wheel and a second support wheel, and the first adjusting mechanism (4) comprises a first adjusting piece and a second adjusting piece. The support shaft assembly (2) has a first end and a second end, the first support wheel is rotationally connected with the first end, the second support wheel is rotationally connected with the second end, the first adjusting piece is arranged on one side of the support shaft assembly (2) close to the first support wheel, and the second adjusting piece is arranged on one side of the support shaft assembly (2) close to the second support wheel.

3. The support device of claim 1, wherein, The support device further comprises a guide assembly (5), the guide assembly (5) is arranged on the base (1), the rack (9) contacts the guide assembly (5), so that the guide assembly (5) generates a rotating friction force relative to the rack (9), and the rotating friction force makes the rack (9) fit with the support piece (3) in position.

4. The support device of claim 3, wherein, The support device further comprises a second adjusting mechanism (7), the guide assembly (5) comprises a first guide wheel (51) and a second guide wheel (52), the first guide wheel (51) and the second guide wheel (52) have a first distance, and the second adjusting mechanism (7) is used for adjusting the first distance.

5. The support apparatus of claim 4, wherein The first guide wheel (51) and the second guide wheel (52) are symmetrically arranged about the center line of the base (1).

6. The support apparatus of claim 4, wherein The guide assembly (5) comprises a mounting plate, the mounting plate is provided with a first mounting hole and a second mounting hole; The first guide wheel (51) is fixedly connected with the mounting plate through the first mounting hole, and the second guide wheel (52) is fixedly connected with the mounting plate through the second mounting hole.

7. The support device according to any one of claims 1-4, characterized in that The base (1) is provided with a support shaft connecting hole, the base (1) is fixedly connected with the support shaft assembly (2) by assembling a fastener in the support shaft connecting hole, and the support shaft connecting hole is a waist-shaped hole.

8. The support device according to any one of claims 1-4, characterized in that The base (1) is provided with a base connecting hole, the base (1) is fixedly connected with the rack base (8) by assembling a fastener in the base connecting hole.

9. The support apparatus of claim 5, wherein, The support piece (3) is provided with a wear-resistant coating.

10. A warehousing system characterized by, The support device comprises a base (1), a support shaft assembly (2), a support piece (3) and a first adjusting mechanism (4); A plurality of support devices are fixedly connected with the rack base (8), and the support devices are used for contacting the rack (9) to guide the rack (9) to move relative to the rack base (8).

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