Universal sample preparation equipment for carbon fiber impregnated yarn and glass fiber impregnated yarn

Abstract

The utility model discloses a universal sample preparation device for carbon fiber impregnated yarn and glass fiber impregnated yarn, which comprises a rack, and a feeding module, a yarn guide module, an impregnation and extrusion module and a forming module which are sequentially arranged on the rack along the length direction of the rack, not only can an external drawing feeding mode of carbon fibers be realized, but also an internal drawing feeding mode of glass fibers can be realized; the real-time tension condition of the carbon fiber can be fed back through the pulley tension sensor, and the output damping of the magnetic damper can be adaptively and accurately adjusted in real time, so that the constant tension control in the carbon fiber impregnation process is realized; by designing a plurality of tension rods, the tension of the glass fiber can be adaptively adjusted, the tension control requirement in the glass fiber impregnation process is met, the structure is stable and reliable, and the cost is low; therefore, the universal sample preparation equipment is good in universality, and the problems of high investment and large occupied area of two pieces of equipment in the past are effectively solved.

Description

Technical Field

[0001] This utility model relates to the technical field of sample preparation equipment for reinforced fiber impregnated yarn, specifically to a universal sample preparation equipment for carbon fiber impregnated yarn and glass fiber impregnated yarn. Background Technology

[0002] The most common and intuitive way to evaluate the mechanical properties of enhanced fibers is to first produce impregnated yarn and then measure its modulus, tensile stress, and stress-strain relationship.

[0003] Currently, reinforcing fiber impregnated yarns are mainly divided into two categories: carbon fiber impregnated yarns and glass fiber impregnated yarns. However, because carbon fiber is fed by external drawing (drawing yarn from the outer circumference), while glass fiber is fed by internal drawing (drawing yarn from the inner circumference), the existing carbon fiber impregnated yarn sample preparation equipment and glass fiber impregnated yarn sample preparation equipment have completely different structures, making them incompatible. For example, Chinese invention patent CN110938953A can only be used to produce carbon fiber impregnated yarns, not glass fiber impregnated yarns.

[0004] Therefore, there is an urgent need to design a universal sample preparation device that can produce both carbon fiber impregnated yarn and glass fiber impregnated yarn, in order to solve the problems of large investment and large footprint of two sample preparation devices. Utility Model Content

[0005] In view of this, the present invention provides a universal sample preparation device for carbon fiber impregnated yarn and glass fiber impregnated yarn.

[0006] The technical solution is as follows:

[0007] The first aspect of this application relates to a universal sample preparation device for carbon fiber impregnated yarn and glass fiber impregnated yarn, comprising a frame and a feeding module, a yarn guiding module, an impregnation and extrusion module, and a forming module sequentially mounted on the frame along its length. The feeding module includes a carbon fiber feeding mechanism and a glass fiber feeding structure. The carbon fiber feeding mechanism includes a first electric linear slide module mounted on the top of the frame, a feeding bracket fixedly mounted on the slide of the first electric linear slide module, a magnetic damper fixedly mounted on the feeding bracket, and a component synchronously rotatably mounted on the magnetic damper. The first electric linear slide module and the carbon fiber roll mounting shaft both extend along the width direction of the frame. The yarn guiding module includes multiple yarn guiding pulleys arranged sequentially along the length direction of the frame and a pulley tension sensor disposed between two of the yarn guiding pulleys. The glass fiber feeding structure includes a glass fiber roll unloading bin located below the carbon fiber feeding mechanism. The yarn outlet of the glass fiber roll unloading bin is opened on the side wall of the frame away from the forming module. Multiple tension bars are installed from bottom to top at the yarn outlet in a staggered zigzag pattern.

[0008] The above-mentioned universal sample preparation equipment for both carbon fiber and glass fiber impregnated yarn can realize both external spinning and internal spinning feeding of carbon fiber and glass fiber. Since the carbon fiber impregnated yarn sample preparation process requires extremely high precision control of constant tension, this universal sample preparation equipment uses a pulley tension sensor to provide real-time feedback on the tension of the carbon fiber and adaptively and precisely adjusts the output damping of the magnetic damper in real time, thereby achieving constant tension control during the carbon fiber impregnation process. Since the glass fiber impregnated yarn sample preparation process has lower requirements for constant tension, this universal sample preparation equipment is designed with multiple tension rods to adaptively adjust the tension of the glass fiber, meeting the tension control requirements of the glass fiber impregnation process. The structure is stable and reliable, and the cost is low. In summary, this universal sample preparation equipment can realize both carbon fiber and glass fiber impregnated yarn sample preparation, has good versatility, and effectively solves the problems of large investment and large footprint associated with the previous two separate pieces of equipment.

[0009] In some embodiments, the yarn guiding module further includes a mounting base plate mounted on the top of the frame, on which a sensor bracket is mounted. At least one correction detection sensor for detecting whether the carbon fiber is curled along the width direction of the frame is mounted on the sensor bracket. The pulley tension sensor and the yarn guiding pulley are both mounted on the mounting base plate and located on the side of the sensor bracket away from the carbon fiber roll mounting shaft.

[0010] In some embodiments, a carbon fiber guide roller parallel to the carbon fiber roll mounting shaft is also rotatably mounted on the feeding bracket, the carbon fiber guide roller being located between the carbon fiber roll mounting shaft and the correction detection sensor.

[0011] In some embodiments, the carbon fiber roll mounting shaft is an air-expanding shaft.

[0012] In some embodiments, a V-groove roller is installed on the top of the yarn outlet. The top of the V-groove roller is higher than the bottom surface of the first electric linear slide module, and the V-groove roller and each yarn guide roller are on the same vertical plane.

[0013] In some embodiments, the impregnation and extrusion module includes an impregnation tank fixedly mounted on a frame. The top of the impregnation tank is an impregnation tank opening extending along the length of the frame. At least one impregnation roller mounting bracket is provided along the extension direction of the impregnation tank opening. An impregnation roller adjacent to the bottom of the impregnation tank is rotatably mounted on the bottom of each impregnation roller mounting bracket. A carbon fiber extrusion assembly and a glass fiber extrusion assembly are detachably mounted on one end of the impregnation tank opening near the molding module.

[0014] In some embodiments, the carbon fiber extrusion assembly includes at least one pair of extrusion rod mounting brackets fixedly mounted opposite each other on both sides of the impregnation tank in the width direction, and an extrusion rod detachably mounted between the corresponding two extrusion rod mounting brackets. Each extrusion rod is also adjustable in its mounting height on the corresponding two extrusion rod mounting brackets.

[0015] In some embodiments, the glass fiber extrusion assembly includes a heightening bracket detachably mounted on an impregnation tank and an extrusion frame rotatably mounted on the heightening bracket. The extrusion frame has a large extrusion hole and a small extrusion hole arranged sequentially toward the imaging module, wherein the diameter of the large extrusion hole is larger than the diameter of the small extrusion hole.

[0016] In some embodiments, the forming module includes a second electric linear slide module mounted on the top of the frame, a yarn frame bracket fixedly mounted on the slide of the second electric linear slide module, a yarn frame drive motor fixedly mounted on the yarn frame bracket, and a forming yarn frame synchronously rotatably mounted on the motor shaft of the yarn frame drive motor. The motor shafts of the second electric linear slide module and the yarn frame drive motor both extend along the width direction of the frame.

[0017] In some embodiments, the bottom of the frame is provided with a plurality of lockable casters. Attached Figure Description

[0018] Figure 1 A schematic diagram of the structure of a general-purpose sample preparation device from one perspective;

[0019] Figure 2 A structural schematic diagram of a general-purpose sample preparation device from another perspective;

[0020] Figure 3 This is a schematic diagram of the yarn guiding module.

[0021] Figure 4 A schematic diagram of the impregnation and extrusion module used in the production of carbon fiber impregnated yarn;

[0022] Figure 5 A schematic diagram of the impregnation and extrusion module for manufacturing glass fiber impregnated yarn;

[0023] Figure 6 A photograph of the actual general sample preparation equipment. Detailed Implementation

[0024] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0025] like Figures 1-5As shown, a general sample preparation device for carbon fiber impregnated yarn and glass fiber impregnated yarn mainly includes a frame 1 and a feeding module, a yarn guiding module, an impregnation and extrusion module, and a forming module that are sequentially installed on the frame 1 along its length. The feeding module is used for feeding, the yarn guiding module is used for guiding the yarn, the impregnation and extrusion module is used for impregnation and extrusion, and the forming module is used for forming. The yarn is usually wound evenly into a roll, and after completion, the sample is dried and tested.

[0026] In this embodiment, the feeding module includes a carbon fiber feeding mechanism and a glass fiber feeding structure. It can achieve both external carbon fiber feeding and internal glass fiber feeding.

[0027] Because the carbon fiber impregnated yarn sample preparation process requires high constant tension (carbon fiber has a strip structure and is prone to tangling during yarn feeding), please refer to [the relevant documentation / reference]. Figures 1-3 The carbon fiber feeding mechanism in this embodiment includes a first electric linear slide module 2, a feeding bracket 3, a magnetic damper 4, and a carbon fiber roll mounting shaft 5.

[0028] The first electric linear slide module 2 is fixedly installed on the top of the frame 1 along the width direction. In this embodiment, the installation position of the first electric linear slide module 2 can be adjusted along the width direction of the frame 1. Specifically, the top of the frame 1 is provided with a strip-shaped hole extending along its width direction. The first electric linear slide module 2 can be locked in the strip-shaped hole by bolts. When the bolts are unlocked, the position of the first electric linear slide module 2 can be adjusted to improve versatility and suitability for carbon fiber rolls of different lengths.

[0029] The feeding bracket 3 is fixedly installed on the slide of the first electric linear slide module 2. Therefore, the slide of the first electric linear slide module 2 can drive the feeding bracket 3 to move horizontally along the width direction of the frame 1.

[0030] A magnetic damper 4 is fixedly installed on the feeding bracket 3. Specifically, the magnetic damper 4 is fixedly installed on one side of the feeding bracket 3. The damper shaft of the magnetic damper 4 passes through the feeding bracket 3 and is synchronously mounted with a carbon fiber roll mounting shaft 5 extending along the width direction of the frame 1. Therefore, when the carbon fiber roll 27 is synchronously mounted on the carbon fiber roll mounting shaft 5, it can be drawn along its outer circumference, that is, external drawing is achieved.

[0031] In this embodiment, the carbon fiber roll mounting shaft 5 is an air-expanding shaft, which can ensure the reliable installation of the carbon fiber roll 27 and avoid slippage during the drawing process.

[0032] Correspondingly, the yarn guiding module includes multiple yarn guiding pulleys 6 arranged sequentially along the length of the frame 1, and a pulley tension sensor 7 disposed between two of the yarn guiding pulleys 6. The extracted carbon fibers, supported and guided by the pulley tension sensor 7 and each yarn guiding pulley 6, are introduced into the impregnation and extrusion module. The pulley tension sensor 7 provides feedback on the real-time tension of the carbon fibers and adaptively and precisely adjusts the output damping of the magnetic damper 4 in real time, thereby achieving constant tension control during the carbon fiber impregnation process. Specifically, the tension sensor 7 detects the tension of the carbon fibers in real time and transmits the signal to the PLC. After comparing the signal with the set value using a PID algorithm, the PLC adjusts the rotational damping of the damper shaft of the magnetic damper 4 to achieve constant tension control, effectively preventing the carbon fibers from breaking due to excessive tightness or piling up due to excessive looseness, ensuring uniform impregnation and the mechanical properties of the finished product.

[0033] Furthermore, the yarn guiding module also includes a mounting base plate 10 that is installed on the top of the frame 1. The pulley tension sensor 7 and each yarn guiding pulley 6 are distributed in a zigzag pattern on the mounting base plate 10 and are all located in the same vertical plane extending along the length of the frame 1. This ensures the measurement accuracy of the pulley tension sensor 7 and also helps to achieve reliable yarn guiding with constant tension.

[0034] A sensor bracket 11 is mounted on the mounting base 10. At least one correction detection sensor 12, used to detect whether the carbon fiber is curling along the width direction of the frame 1, is mounted on the sensor bracket 11 along the width direction of the frame 1. The pulley tension sensor 7 and the yarn guide pulley 6 are both mounted on the mounting base 10 and located on the side of the sensor bracket 11 away from the carbon fiber roll mounting shaft 5. By setting the correction detection sensor 12, it is possible to monitor in real time whether the carbon fiber extension direction is completely maintained within the same vertical plane extending along the length direction of the frame 1. If the correction detection sensor 12 detects a deviation, it can immediately transmit the information to the PLC, controlling the electric linear slide module 2 to adjust the position of the carbon fiber roll 27, thus achieving real-time correction.

[0035] In this embodiment, the correction detection sensor 12 is preferably a color mark sensor, which can accurately detect changes through extended recognition; that is, if the color changes, correction is required. Alternatively, the correction detection sensor 12 can be a photoelectric sensor, which detects changes through the return information of the laser; that is, if the laser does not return, correction is required.

[0036] Furthermore, the position of each correction detection sensor 12 can be adjusted by the sensor bracket 11 to adapt to carbon fibers of different widths (carbon fibers are usually in the form of strips), thus improving the versatility of the equipment.

[0037] Therefore, this embodiment takes into account the characteristic of carbon fiber being easy to curl, and uses a deviation correction detection sensor 12 to correct deviation in real time, ensuring that the carbon fiber is always in the same vertical plane during the impregnation process, avoiding carbon fiber damage or sample performance degradation caused by deviation, and improving the accuracy and consistency of sample preparation.

[0038] Furthermore, a carbon fiber guide roller 13 parallel to the carbon fiber roll mounting shaft 5 is rotatably mounted on the feeding bracket 3. The carbon fiber guide roller 13 is located between the carbon fiber roll mounting shaft 5 and the correction detection sensor 12. By adding the carbon fiber guide roller 13, the stability and reliability of yarn guiding can be effectively improved.

[0039] Because the process of preparing glass fiber impregnated yarn samples has relatively low requirements for constant tension (glass fiber has a filamentous structure), please refer to [the relevant documentation / reference]. Figures 1-3 In this embodiment, the glass fiber feeding structure includes a glass fiber unwinding hopper 1a located below the carbon fiber feeding mechanism. The outlet 1a1 of the glass fiber unwinding hopper 1a is located on the side wall of the frame 1 away from the forming module. Multiple tension rods 9 arranged in a zigzag pattern are installed from bottom to top on the outlet 1a1. When the glass fiber roll 28 is placed in the glass fiber unwinding hopper 1a, the tension of the glass fiber can be adaptively adjusted by designing multiple tension rods 9 arranged in a zigzag pattern at the outlet 1a1, thus meeting the tension control requirements of the glass fiber impregnation process. The structure is stable, reliable, and inexpensive.

[0040] Furthermore, to ensure the stability and reliability of glass fiber conveying, a V-groove roller 14 is installed on the top of the yarn outlet 1a1 in this embodiment. The top of the V-groove roller 14 is higher than the bottom surface of the first electric linear slide module 2, and the V-groove roller 14 and each yarn guide roller 6 are on the same vertical plane. The glass fiber is first guided by each yarn guide roller 6 to the V-groove roller 14, and then guided by the V-groove roller 14 to the carbon fiber guide roller 13. The remaining path is the same as that of the carbon fiber.

[0041] Please see Figure 1 , Figure 2 , Figure 4 and Figure 5 The impregnation and extrusion module includes an impregnation tank 15 fixedly mounted on a frame 1. The top of the impregnation tank 15 is an impregnation tank opening 15a extending along the length of the frame 1. At least one impregnation roller mounting bracket 16 is provided along the extension direction of the impregnation tank opening 15a. An impregnation roller 16a is rotatably mounted on the bottom of each impregnation roller mounting bracket 16, adjacent to the bottom of the impregnation tank 15. A carbon fiber extrusion assembly and a glass fiber extrusion assembly are detachably mounted on the end of the impregnation tank opening 15a near the molding module. After the carbon fiber or glass fiber enters the impregnation tank 15, it is first impregnated at the bottom of the impregnation tank 15 under the guidance of each impregnation roller 16a. After leaving the liquid surface, it is then extruded by the carbon fiber extrusion assembly or the glass fiber extrusion assembly.

[0042] In this embodiment, both the carbon fiber extrusion assembly and the glass fiber extrusion assembly adopt a detachable structure to avoid interference.

[0043] The carbon fiber extrusion assembly includes at least one pair of extrusion rod mounting brackets 17 fixedly mounted on opposite sides of the impregnation tank 15 in the width direction, and extrusion rods 18 detachably mounted between the corresponding two extrusion rod mounting brackets 17. Each extrusion rod 18 can also be adjusted in height on its corresponding two extrusion rod mounting brackets 17. Specifically, since the carbon fiber has a strip-like structure, extrusion is completed by contacting the surfaces of each extrusion rod 18. Each extrusion rod mounting bracket 17 has a vertically extending strip-shaped mounting hole 17a. Both ends of the extrusion rod 18 can be locked into the corresponding strip-shaped mounting hole 17a by bolts. Unlocking the bolts allows the extrusion rod 18 to be raised or lowered for adjustment; tightening the bolts after adjustment completes the adjustment.

[0044] The glass fiber extrusion assembly includes a detachable support bracket 20 mounted on the impregnation tank 15 and an extrusion frame 21 rotatably mounted on the support bracket 20. The extrusion frame 21 has a large extrusion hole 21a and a small extrusion hole 21b arranged sequentially towards the imaging module, with the diameter of the large extrusion hole 21a being larger than that of the small extrusion hole 21b. The glass fiber is first extruded through the larger large extrusion hole 21a and then through the smaller small extrusion hole 21b, effectively squeezing out excess resin and air. Simultaneously, the extrusion frame 21 is rotatable, allowing it to adaptively adjust its rotation angle to match the thickness of the glass fiber winding on the molding module.

[0045] Please see Figure 1 and Figure 2 The forming module includes a second electric linear slide module 22 mounted on the top of the frame 1, a yarn frame support 23 fixedly mounted on the slide of the second electric linear slide module 22, a yarn frame drive motor 24 fixedly mounted on the yarn frame support 23, and a forming yarn frame 25 synchronously rotatably mounted on the motor shaft of the yarn frame drive motor 24. The motor shafts of both the second electric linear slide module 22 and the yarn frame drive motor 24 extend along the width direction of the frame 1. The rotation of the forming yarn frame 25 driven by the yarn frame drive motor 24 allows carbon fiber or glass fiber to be wound onto the forming yarn frame 25, and also serves as the power source for yarn drawing. Simultaneously, the second electric linear slide module 22 ensures that carbon fiber or glass fiber is evenly wound onto the forming yarn frame 25, facilitating subsequent yarn sampling and testing, thereby achieving fully automated and precise control.

[0046] Furthermore, the mounting position of the second electric linear slide module 22 can be adjusted along the width direction of the frame 1. Specifically, the top of the frame 1 is provided with a strip-shaped hole extending along its width direction. The second electric linear slide module 22 can be locked in the strip-shaped hole by bolts. When the bolts are unlocked, the position of the second electric linear slide module 22 can be adjusted to improve versatility.

[0047] In this embodiment, the bottom of the frame 1 is provided with multiple lockable casters 26. When each caster 26 is unlocked, the overall movement of the equipment is convenient and easy.

[0048] Therefore, the impregnation and extrusion module in this embodiment takes into account the versatility of impregnation and extrusion of carbon fiber and glass fiber. At the same time, through collaborative design, it ensures that the yarn is fully impregnated with resin on the one hand, and removes excess resin through precise extrusion on the other hand, avoiding uneven resin amount or waste, so as to achieve the optimal bonding strength between fiber and resin and improve the reliability of composite material samples.

[0049] Finally, it should be noted that each module of this general sample preparation equipment has achieved fully automated closed-loop control, which greatly reduces human error and ensures that the process parameters of different batches of samples are consistent, providing highly repeatable standardized samples for quality inspection.

[0050] Finally, it should be noted that the above description is merely a preferred embodiment of the present utility model. Those skilled in the art, under the guidance of the present utility model, can make various similar representations without departing from the spirit and claims of the present utility model, and such modifications all fall within the protection scope of the present utility model.

Claims

1. A universal sample preparation device for carbon fiber impregnated yarn and glass fiber impregnated yarn, comprising a frame and a feeding module, a yarn guiding module, an impregnation and extrusion module, and a forming module sequentially mounted on the frame along its length, characterized in that: The feeding module includes a carbon fiber feeding mechanism and a glass fiber feeding structure. The carbon fiber feeding mechanism includes a first electric linear slide module mounted on the top of the frame, a feeding bracket fixedly mounted on the slide of the first electric linear slide module, a magnetic damper fixedly mounted on the feeding bracket, and a carbon fiber roll mounting shaft synchronously rotatably mounted on the damper shaft of the magnetic damper. Both the first electric linear slide module and the carbon fiber roll mounting shaft extend along the width direction of the frame. The yarn guiding module includes multiple yarn guiding pulleys arranged sequentially along the length direction of the frame and a pulley tension sensor disposed between two of the yarn guiding pulleys. The glass fiber feeding structure includes a glass fiber roll unloading bin located below the carbon fiber feeding mechanism. The yarn outlet of the glass fiber roll unloading bin is opened on the side wall of the frame away from the forming module. Multiple tension bars are installed from bottom to top at the yarn outlet in a staggered zigzag pattern.

2. The universal sample preparation equipment for carbon fiber impregnated yarn and glass fiber impregnated yarn according to claim 1, characterized in that: The yarn guiding module also includes a mounting base plate mounted on the top of the frame. A sensor bracket is mounted on the mounting base plate. At least one correction detection sensor for detecting whether the carbon fiber is curled along the width direction of the frame is mounted on the sensor bracket. The pulley tension sensor and the yarn guiding pulley are both mounted on the mounting base plate and located on the side of the sensor bracket away from the carbon fiber roll mounting shaft.

3. The universal sample preparation equipment for carbon fiber impregnated yarn and glass fiber impregnated yarn according to claim 2, characterized in that: The feeding bracket is also rotatably mounted with a carbon fiber guide roller parallel to the carbon fiber roll mounting shaft, which is located between the carbon fiber roll mounting shaft and the correction detection sensor.

4. The universal sample preparation equipment for carbon fiber impregnated yarn and glass fiber impregnated yarn according to any one of claims 1-3, characterized in that: The carbon fiber roll mounting shaft is an air-expanding shaft.

5. The universal sample preparation equipment for carbon fiber impregnated yarn and glass fiber impregnated yarn according to claim 1, characterized in that: A V-groove roller is installed at the top of the yarn outlet. The top of the V-groove roller is higher than the bottom surface of the first electric linear slide module, and the V-groove roller and each yarn guide roller are on the same vertical plane.

6. The universal sample preparation equipment for carbon fiber impregnated yarn and glass fiber impregnated yarn according to claim 1, characterized in that: The impregnation and extrusion module includes an impregnation tank fixedly mounted on a frame. The top of the impregnation tank is an impregnation tank opening extending along the length of the frame. At least one impregnation roller mounting frame is provided along the extension direction of the impregnation tank opening. An impregnation roller adjacent to the bottom of the impregnation tank is rotatably mounted on the bottom of each impregnation roller mounting frame. A carbon fiber extrusion assembly and a glass fiber extrusion assembly are detachably mounted on the end of the impregnation tank opening near the molding module.

7. The universal sample preparation equipment for carbon fiber impregnated yarn and glass fiber impregnated yarn according to claim 6, characterized in that: The carbon fiber extrusion assembly includes at least one pair of extrusion rod mounting brackets fixedly installed on both sides of the impregnation tank in the width direction, and an extrusion rod that can be detachably installed between the corresponding two extrusion rod mounting brackets. Each extrusion rod can also be adjusted in installation height on the corresponding two extrusion rod mounting brackets.

8. The universal sample preparation equipment for carbon fiber impregnated yarn and glass fiber impregnated yarn according to claim 6, characterized in that: The glass fiber extrusion assembly includes a heightening bracket detachably mounted on an impregnation tank and an extrusion frame rotatably mounted on the heightening bracket. The extrusion frame has a large extrusion hole and a small extrusion hole arranged sequentially toward the imaging module. The diameter of the large extrusion hole is larger than the diameter of the small extrusion hole.

9. The universal sample preparation equipment for carbon fiber impregnated yarn and glass fiber impregnated yarn according to claim 1, characterized in that: The forming module includes a second electric linear slide module mounted on the top of the frame, a yarn frame bracket fixedly mounted on the slide of the second electric linear slide module, a yarn frame drive motor fixedly mounted on the yarn frame bracket, and a forming yarn frame synchronously mounted on the motor shaft of the yarn frame drive motor. The motor shafts of the second electric linear slide module and the yarn frame drive motor both extend along the width direction of the frame.

10. The universal sample preparation equipment for carbon fiber impregnated yarn and glass fiber impregnated yarn according to claim 1, characterized in that: The bottom of the frame is equipped with multiple lockable casters.

Images