A liquid chromatograph

Abstract

This utility model discloses a liquid chromatograph, relating to the field of chromatograph technology. The utility model includes a degasser, a quaternary pump, an injector, a detector, and a column oven stacked sequentially. The degasser is equipped with a solvent tray, and a limiting assembly is installed in the solvent tray. The limiting assembly includes a drive box, a limiting clamp, and a drive rod. The drive box is connected to one side of the solvent tray, and the limiting clamp and the drive rod are respectively installed on both sides of the drive box. The drive rod is connected to the limiting clamp, and when the drive rod moves within the drive box, it drives the limiting clamp to open and close. The limiting assembly clamps and secures the solvent bottle placed in the solvent tray through the limiting clamp, preventing the solvent bottle from accidentally falling out of the solvent tray during operation and causing toxic solvents to evaporate into the working environment, thus avoiding harm to the operator's health.

Description

Technical Field

[0001] This utility model belongs to the field of chromatography technology, and more specifically, relates to a liquid chromatograph. Background Technology

[0002] A liquid chromatograph (LC) is an instrument that separates and analyzes components in a mixture by utilizing the differences in their partition coefficients between a stationary phase and a mobile phase. Its basic principle is based on the "like dissolves like" principle and the differences in the distribution equilibrium of substances between two phases. The stationary phase is the packing material inside the chromatographic column, such as silica gel or a chemically bonded phase; the mobile phase is the liquid that carries the sample through the column, commonly an aqueous solution or an organic solvent. After the sample is injected into the instrument, the components continuously undergo adsorption, desorption, dissolution, or precipitation between the stationary and mobile phases. Components with smaller partition coefficients move faster with the mobile phase and elute from the column first; components with larger partition coefficients move slower and elute later, thus achieving the separation of the mixture. The separated components then pass sequentially through detectors, converting the concentration signals into electrical or optical signals, ultimately presenting a chromatogram for researchers to analyze.

[0003] In existing technology, solvent bottles containing the mobile phase are generally placed directly in the upper tray of the liquid chromatograph. The solution in the solvent bottle is introduced into the liquid chromatograph through a connecting tube. Because the tubes on the solvent bottle are placed haphazardly, the operator can easily touch the tubes while operating the liquid chromatograph, thereby pulling the solvent bottle out of the tray and causing it to break. Furthermore, the solvent in the bottle is volatile and contains a certain degree of toxicity. When the solvent bottle breaks, the leaked solvent will evaporate into the working environment, thereby harming the operator's health. Utility Model Content

[0004] In view of the problems in the related technologies, this utility model proposes a liquid chromatograph to overcome the above-mentioned technical problems existing in the existing related technologies.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0006] This utility model relates to a liquid chromatograph, comprising a degasser, a quaternary pump, an injector, a detector, and a column oven stacked sequentially. The degasser is provided with a solvent tray, and a limiting component is installed in the solvent tray. The limiting component includes a drive box, a limiting clamp, and a drive rod. The drive box is connected to one side of the solvent tray, and the limiting clamp and the drive rod are respectively installed on both sides of the drive box. The drive rod is connected to the limiting clamp, and when the drive rod moves within the drive box, it drives the limiting clamp to open and close.

[0007] Furthermore, the solvent tray is fixedly installed on the top of the degasser, and the solvent tray has multiple placement slots, which are evenly arranged on the solvent tray.

[0008] Furthermore, the drive box is fixedly installed on the solvent tray, and two sliding grooves are sequentially opened on the side of the drive box near the placement groove. An installation plate is provided between the sliding grooves, and the installation plate is fixedly connected to the drive box. A fixing plate is fixedly installed inside the drive box, and the fixing plate is located on the side of the installation plate away from the placement groove.

[0009] Furthermore, in the aforementioned liquid chromatograph, a guide rail is fixedly installed on the side of the fixed plate away from the sliding groove, and a bearing seat is also fixedly installed on this side of the fixed plate, the bearing seat being located below one end of the guide rail.

[0010] Furthermore, for the aforementioned liquid chromatograph, a sliding seat is fixedly connected to the bottom of the end of the limiting clamp away from the drive box, and multiple rubber pads are fixedly connected sequentially to the middle section of the limiting clamp. Each rubber pad corresponds to one of the placement slots. The other end of the limiting clamp passes through two of the sliding slots and is slidably mounted on the mounting plate. Each pair of limiting clamps forms a group, and two groups of limiting clamps are installed on the drive box. A transmission rack is fixedly connected to one end of each limiting clamp inside the drive box. The transmission rack on one of the limiting clamps in each group is located in the upper sliding slot, while the transmission rack on the other limiting clamp is located in the lower sliding slot.

[0011] Furthermore, a drive shaft is rotatably mounted on both ends of the fixed plate, and a drive gear and a driven gear are coaxially fixedly connected to both ends of the drive shaft. The drive gear is located between the mounting plate and the fixed plate. The two drive racks of each set of limiting clamps mesh on the upper and lower sides of the drive gear, respectively, and the driven gear is located on the other side of the fixed plate.

[0012] Furthermore, the drive rod is slidably mounted on the guide rail, and drive racks are fixedly connected to both ends of the drive rod. The drive racks mesh with the lower side of the driven gear. The bottom of the drive rod is threadedly fitted onto the screw rod. One end of the screw rod is rotatably mounted on the bearing seat, and the other end of the screw rod passes through the side of the drive box. A knob is fixedly connected to this end of the screw rod.

[0013] Furthermore, for the aforementioned liquid chromatograph, two mounting bases are fixedly installed on both sides of the solvent tray, with the two mounting bases located on the side of the placement slot away from the drive box, and a sliding rod is fixedly connected between the two mounting bases, with the sliding base slidably mounted on the sliding rod.

[0014] This invention has the following advantages: When analyzing samples using this liquid chromatograph, firstly, the screw is rotated in the opposite direction by turning the knob. The rotating screw drives the drive rod to slide on the guide rail towards the knob, causing the drive rack on the drive rod to drive the driven gear to rotate in the forward direction. The driven gear then drives the transmission gear at the other end of the transmission shaft to rotate in the same direction, causing the two transmission racks on the upper and lower sides of the transmission gear to move away from each other, opening the limiting clamp that was in a closed state. Then, the solvent bottle containing the solvent is placed in the placement slot of the solvent tray, so that the solvent bottle is located in the opened limiting clamp. After placing the solvent bottle, the screw is rotated in the forward direction by turning the knob. The rotating screw drives the drive rod to slide on the guide rail away from the knob, causing the drive rack on the drive rod to drive the driven gear to rotate in the opposite direction. The driven gear then drives the transmission gear at the other end of the transmission shaft to rotate in the same direction, causing the transmission gears on the upper and lower sides to move closer to each other, closing the opened limiting clamp, so that the limiting clamp is clamped on both sides of the solvent bottle by the rubber pads, fixing the solvent bottle in the solvent tray. The system is then activated sequentially via the degasser, quaternary pump, injector, detector, and column oven. The sample is placed in the injector, the quaternary pump extracts the solvent from the solvent bottle, the degasser removes tiny air bubbles from the solvent, and the solvent is then delivered into the chromatographic column within the column oven. Simultaneously, the injector injects the sample into the column. After passing through the column, the sample and solvent enter the detector for detection. When the detection is complete and the solvent bottle needs to be removed, the closed limiting clamp is opened via the drive rod, allowing the solvent bottle to be removed. The limiting component securely holds the solvent bottle in the solvent tray during operation, preventing accidental spillage and the release of toxic solvents into the working environment, thus protecting operator health. The rubber pads cushion the solvent bottle, preventing scratches, and increase friction for a more secure grip.

[0015] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the utility model embodiments, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a side view of the main body structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the main planar structure of the present utility model;

[0019] Figure 3 This is a side view of the solvent tray structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the internal structure of the drive box of this utility model;

[0021] Figure 5 for Figure 4 A magnified schematic diagram of the structure at point A.

[0022] The attached diagram lists the components represented by each number as follows:

[0023] 1. Degasser; 2. Quaternary pump; 3. Injector; 4. Detector; 5. Column oven; 6. Solvent tray; 61. Placement slot; 62. Fixing seat; 63. Slide bar; 7. Limiting assembly; 71. Drive box; 711. Sliding groove; 712. Mounting plate; 713. Fixing plate; 714. Guide rail; 715. Bearing seat; 72. Limiting clamp; 721. Sliding seat; 722. Rubber pad; 723. Drive rack; 73. Drive shaft; 731. Drive gear; 732. Driven gear; 74. Drive rod; 741. Drive rack; 742. Screw; 75. Knob. Detailed Implementation

[0024] The technical solutions of the utility model embodiments will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the utility model, and not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the utility model.

[0025] In the description of this utility model, it should be understood that the terms "opening", "upper", "lower", "top", "middle", "inner", etc., which indicate orientation or positional relationship, are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0026] Please see Figure 1-5 As shown, this utility model is a liquid chromatograph, including a degasser 1, a quaternary pump 2, an injector 3, a detector 4, and a column oven 5 stacked sequentially. A solvent tray 6 is provided on the degasser 1, and a limiting component 7 is installed in the solvent tray 6. The limiting component 7 includes a drive box 71, a limiting clamp 72, and a drive rod 74. The drive box 71 is connected to one side of the solvent tray 6, and the limiting clamp 72 and drive rod 74 are respectively installed on both sides of the drive box 71. The drive rod 74 is connected to the limiting clamp 72. When the drive rod 74 moves within the drive box 71, it drives the limiting clamp 72 to open and close. When using this liquid chromatograph for sample analysis, first, the drive rod 74 is driven to open the limiting clamp 72, which is in a closed state. Then, a solvent bottle containing solvent is placed on the solvent tray 6, so that the solvent bottle is located in the open limiting clamp 72. After the solvent bottle is placed, the drive rod 74 is driven to move in the opposite direction to close the open limiting clamp 72, thus limiting the solvent bottle. Clamping plate 72 holds and fixes the solvent bottle in solvent tray 6. Then, the degasser 1, quaternary pump 2, injector 3, detector 4, and column oven 5 are started in sequence. The sample is placed into injector 3, quaternary pump 2 extracts the solvent from the solvent bottle, degasser 1 removes tiny air bubbles from the solvent, and then the solvent is delivered into the chromatographic column in column oven 5. At the same time, injector 3 also injects the sample into the chromatographic column. After the sample and solvent pass through the chromatographic column, they enter detector 4 for detection. When the detection is completed and the solvent bottle needs to be removed, the closed limiting clamping plate 72 is opened by drive rod 74 to remove the solvent bottle. Through the setting of limiting component 7, during the use of liquid chromatograph, limiting component 7 clamps and fixes the solvent bottle placed in solvent tray 6 through limiting clamping plate 72, preventing the solvent bottle from accidentally falling out of solvent tray 6 during operation and causing toxic solvent to evaporate into the working environment, thus avoiding harm to the health of operators.

[0027] In one embodiment, for the liquid chromatograph described above, the solvent tray 6 is fixedly installed on the top of the degasser 1. The solvent tray 6 has multiple placement slots 61, which are evenly arranged on the solvent tray 6. When placing the solvent bottle, the solvent bottle needs to be placed in the placement slot 61. The placement slot 61 not only allows the solvent bottle to be placed in the solvent tray 6 in an orderly manner, but also facilitates the clamping of the limiting clamp 72.

[0028] In one embodiment, for the above-mentioned liquid chromatograph, the drive box 71 is fixedly installed on the solvent tray 6. Two sliding grooves 711 are sequentially opened on the side of the drive box 71 near the placement groove 61. An installation plate 712 is provided between the sliding grooves 711. The installation plate 712 is fixedly connected to the drive box 71. A fixing plate 713 is fixedly installed inside the drive box 71. The fixing plate 713 is located on the side of the installation plate 712 away from the placement groove 61.

[0029] In one embodiment, for the liquid chromatograph described above, a guide rail 714 is fixedly installed on the side of the fixed plate 713 away from the sliding groove 711, and a bearing seat 715 is also fixedly installed on this side of the fixed plate 713, with the bearing seat 715 located below one end of the guide rail 714.

[0030] In one embodiment, for the aforementioned liquid chromatograph, a sliding seat 721 is fixedly connected to the bottom of the limiting clamp 72 away from the drive box 71. Multiple rubber pads 722 are sequentially fixedly connected to the middle section of the limiting clamp 72, each corresponding to a placement groove 61. The other end of the limiting clamp 72 passes through two sliding grooves 711 and is slidably mounted on the mounting plate 712. Each pair of limiting clamps 72 forms a group, and two groups of limiting clamps 72 are mounted on the drive box 71. A transmission rack 723 is fixedly connected to the end of each limiting clamp 72 located inside the drive box 71. The transmission rack 723 on one limiting clamp 72 in each group is located in the upper sliding groove 711, while the transmission rack 723 on the other limiting clamp 72 is located in the lower sliding groove 711. Initially, each group of limiting clamps 72 is in a closed state. When it is necessary to open each group of limiting clamps... When the clamping plate 72 is in place, the moving drive rod 74 drives the transmission rack 723, causing the transmission rack 723 to drive the limiting clamping plate 72 to slide along the sliding groove 711 on the mounting plate 712. This causes the two limiting clamping plates 72 in each group to move away from each other, changing from a closed state to an open state. After the solvent bottle is placed in the placement slot 61, as the drive rod 74 moves in the opposite direction, the transmission rack 723 again drives the limiting clamping plate 72 to slide along the sliding groove 711 on the mounting plate 712. This causes the two open limiting clamping plates 72 in each group to move closer to each other, so that the rubber pads 722 on the limiting clamping plate 72 clamp the sides of the solvent bottle, thereby fixing the solvent bottle in the solvent tray 6. Through the setting of the rubber pads 722, when the limiting clamping plate 72 clamps the solvent bottle, the rubber pads 722 can play a buffering role, preventing the limiting clamping plate 72 from scratching the solvent bottle. At the same time, the rubber pads 722 can also increase the friction, making the limiting clamping plate 72 clamp more firmly.

[0031] In one embodiment, for the aforementioned liquid chromatograph, a drive shaft 73 is rotatably mounted on both ends of the fixed plate 713. A drive gear 731 and a driven gear 732 are coaxially fixedly connected to both ends of the drive shaft 73, respectively. The drive gear 731 is located between the mounting plate 712 and the fixed plate 713. Two drive racks 723 of each set of limiting clamps 72 mesh with the upper and lower sides of the drive gear 731, respectively. The driven gear 732 is located on the other side of the fixed plate 713. When it is necessary to open the limiting clamp 72, the drive rod... The movement of 74 causes the driven gear 732 to drive the transmission gear 731 at the other end of the transmission shaft 73 to rotate in the forward direction, causing the transmission gear 731 to drive the two transmission racks 723 on the upper and lower sides to move away from each other, thereby opening the limiting clamp 72. When it is necessary to close the limiting clamp 72, as the drive rod 74 moves in the reverse direction, the driven gear 732 drives the transmission gear 731 at the other end of the transmission shaft 73 to rotate in the reverse direction, causing the transmission gear 731 to drive the two transmission racks 723 on the upper and lower sides to move closer to each other, thereby closing the limiting clamp 72.

[0032] In one embodiment, for the aforementioned liquid chromatograph, the drive rod 74 is slidably mounted on the guide rail 714, and drive racks 741 are fixedly connected to both ends of the drive rod 74. The drive racks 741 mesh with the lower side of the driven gear 732. The bottom of the drive rod 74 is threadedly fitted onto the screw 742. One end of the screw 742 is rotatably mounted on the bearing seat 715, and the other end of the screw 742 passes through the side of the drive box 71. A knob 75 is fixedly connected to this end of the screw 742. When the limiting clamp 72 is opened... When the knob 75 is turned in the opposite direction, the screw 742 is rotated in the reverse direction. The rotating screw 742 drives the drive rod 74 to slide on the guide rail 714 in the direction of the knob 75, causing the drive rack 741 on the drive rod 74 to drive the driven gear 732 to rotate in the forward direction. When the limit clamp 72 is closed, the knob 75 is turned in the forward direction, and the rotating screw 742 drives the drive rod 74 to slide on the guide rail 714 in the direction away from the knob 75, causing the drive rack 741 on the drive rod 74 to drive the driven gear 732 to rotate in the reverse direction.

[0033] In one embodiment, for the liquid chromatograph described above, two fixed seats 62 are fixedly installed on both sides of the solvent tray 6. The two fixed seats 62 are located on the side of the placement groove 61 away from the drive box 71. A slide rod 63 is fixedly connected between the two fixed seats 62. The slide seat 721 is slidably installed on the slide rod 63. When the drive rod 74 drives the limiting clamp 72 to open and close, the limiting clamp 72 moves on the slide rod 63 through the slide seat 721. The slide rod 63 provides support for the limiting clamp 72, so that the limiting clamp 72 can operate stably.

[0034] In summary, by means of the above-mentioned technical solution of this utility model, when performing sample analysis using this liquid chromatograph, firstly, the screw 742 is rotated in the reverse direction by the knob 75. The rotating screw 742 drives the drive rod 74 to slide on the guide rail 714 in the direction of the knob 75, causing the drive rack 741 on the drive rod 74 to drive the driven gear 732 to rotate in the forward direction. The driven gear 732 then drives the transmission gear 731 at the other end of the transmission shaft 73 to rotate in the same direction, driving the two transmission racks 723 on the upper and lower sides of the transmission gear 731 to move away from each other, opening the limiting clamp 72 which was in a closed state. Then, the solvent bottle containing the solvent is placed in the placement slot 61 of the solvent tray 6, so that the solvent bottle is located in the opened limiting clamp 72. After the solvent bottle is placed, the screw 742 is rotated in the forward direction by the knob 75. The rotating screw 742 drives the drive rod 74 to slide on the guide rail 714 in the direction away from the knob 75, causing the drive rod 74 to move away from the knob 75. The drive rack 741 drives the driven gear 732 to rotate in the opposite direction. The driven gear 732 drives the transmission gear 731 at the other end of the transmission shaft 73 to rotate in the same direction. This causes the transmission gear 731 to drive the two transmission racks 723 on the upper and lower sides to move closer together, closing the open limiting clamp 72. The limiting clamp 72 is then clamped on both sides of the solvent bottle by the rubber pad 722, fixing the solvent bottle in the solvent tray 6. Subsequently, the degasser 1, quaternary pump 2, injector 3, detector 4, and column oven 5 are started in sequence. The sample is placed into the injector 3, the quaternary pump 2 extracts the solvent from the solvent bottle, the degasser 1 removes the tiny air bubbles from the solvent, and then the solvent is delivered into the chromatographic column in the column oven 5. At the same time, the injector 3 also injects the sample into the chromatographic column. After the sample and solvent pass through the chromatographic column, they enter the detector 4 for detection. When the detection is completed and the solvent bottle needs to be removed, the closed limiting clamp 72 is opened by the drive rod 74, and the solvent bottle is removed.

[0035] Through the above technical solution, 1. By setting the limiting component, during the use of the liquid chromatograph, the limiting component clamps and fixes the solvent bottle placed in the solvent tray through the limiting clamp, preventing the solvent bottle from accidentally falling out of the solvent tray during operation, causing toxic solvent to evaporate into the working environment, and avoiding harm to the health of the operator.

[0036] 2. The rubber pad acts as a buffer when the limiting clamp holds the solvent bottle, preventing the limiting clamp from scratching the solvent bottle. At the same time, the rubber pad also increases friction, making the limiting clamp hold the bottle more firmly.

[0037] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0038] The preferred embodiments of the utility model disclosed above are merely illustrative of the utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the utility model, thereby enabling those skilled in the art to better understand and utilize it. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A liquid chromatograph, characterized in that: The system includes a degasser (1), a quaternary pump (2), an injector (3), a detector (4), and a column oven (5) stacked in sequence. The degasser (1) is provided with a solvent tray (6). A limiting component (7) is installed in the solvent tray (6). The limiting component (7) includes a drive box (71), a limiting clamp (72), and a drive rod (74). The drive box (71) is connected to one side of the solvent tray (6). The limiting clamp (72) and the drive rod (74) are respectively installed on both sides of the drive box (71), and the drive rod (74) is connected to the limiting clamp (72). When the drive rod (74) moves inside the drive box (71), it drives the limiting clamp (72) to open and close.

2. The liquid chromatograph according to claim 1, characterized in that, The solvent tray (6) is fixedly installed on the top of the degasser (1). The solvent tray (6) has multiple placement slots (61) and the multiple placement slots (61) are evenly arranged on the solvent tray (6).

3. A liquid chromatograph according to claim 2, characterized in that, The drive box (71) is fixedly installed on the solvent tray (6). Two sliding grooves (711) are sequentially opened on the side of the drive box (71) near the placement groove (61). An installation plate (712) is provided between the sliding grooves (711). The installation plate (712) is fixedly connected to the drive box (71). A fixing plate (713) is fixedly installed inside the drive box (71). The fixing plate (713) is located on the side of the installation plate (712) away from the placement groove (61).

4. A liquid chromatograph according to claim 3, characterized in that, A guide rail (714) is fixedly installed on the side of the fixed plate (713) away from the sliding groove (711), and a bearing seat (715) is also fixedly installed on this side of the fixed plate (713), the bearing seat (715) being located below one end of the guide rail (714).

5. A liquid chromatograph according to claim 4, characterized in that, The bottom of the limiting clamp (72) away from the drive box (71) is fixedly connected to a sliding seat (721). Multiple rubber pads (722) are sequentially fixedly connected to the middle section of the limiting clamp (72), each rubber pad (722) corresponding to one of the placement slots (61). The other end of the limiting clamp (72) passes through two sliding slots (711) and is slidably mounted on the mounting plate (712). Each pair of limiting clamps (72) forms a group. Two sets of limiting plates (72) are installed on the drive box (71). Each limiting plate (72) has a transmission rack (723) fixedly connected to one end inside the drive box (71). The transmission rack (723) on one of the limiting plates (72) is located in the upper sliding groove (711), while the transmission rack (723) on the other limiting plate (72) is located in the lower sliding groove (711).

6. A liquid chromatograph according to claim 5, characterized in that, A drive shaft (73) is rotatably mounted on both ends of the fixed plate (713). A drive gear (731) and a driven gear (732) are coaxially fixedly connected to both ends of the drive shaft (73). The drive gear (731) is located between the mounting plate (712) and the fixed plate (713). The two drive racks (723) of each set of limiting clamps (72) are respectively meshed on the upper and lower sides of the drive gear (731). The driven gear (732) is located on the other side of the fixed plate (713).

7. A liquid chromatograph according to claim 6, characterized in that, The drive rod (74) is slidably mounted on the guide rail (714). Both ends of the drive rod (74) are fixedly connected to drive racks (741). The drive racks (741) mesh with the lower side of the driven gear (732). The bottom of the drive rod (74) is threaded onto the screw (742). One end of the screw (742) is rotatably mounted on the bearing seat (715). The other end of the screw (742) passes through the side of the drive box (71). A knob (75) is fixedly connected to this end of the screw (742).

8. A liquid chromatograph according to claim 5, characterized in that, Fixing seats (62) are fixedly installed on both sides of the solvent tray (6). The two fixing seats (62) are located on the side of the placement slot (61) away from the drive box (71). A sliding rod (63) is fixedly connected between the two fixing seats (62). The sliding seat (721) is slidably installed on the sliding rod (63).

Images