A test bench for fuel injector production

Abstract

This utility model discloses a test bench for fuel injector production, relating to the technical field of fuel injector production test benches. It includes a machine body, a measuring cylinder assembly, and a connecting and positioning component. The measuring cylinder assembly is fixedly connected to the upper front end of the machine body, and the connecting and positioning component is fixedly connected to the upper end of the measuring cylinder assembly. This utility model, through the coordinated use of the machine body, measuring cylinder assembly, connecting and positioning component, protective device, protective cover, observation window, explosion-proof glass, rotating parts, fixing device, housing, locking component, pressing component, linkage control component, and clamp, solves the problems of existing fuel injector test benches where, during idle or transport, the components on the machine body are usually exposed and easily damaged by dust and impacts, affecting the equipment's accuracy and service life. Furthermore, traditional protective methods are difficult to fix, resulting in inconvenient opening and closing, and unstable protection during transport, failing to meet protection requirements during idle or transport periods.

Description

Technical Field

[0001] This utility model relates to the technical field of fuel injector production test benches, specifically a test bench for fuel injector production. Background Technology

[0002] The fuel injector production test bench is a key piece of equipment for ensuring quality in the fuel injector manufacturing process. It integrates technologies from multiple fields such as mechanics, hydraulics, electrical engineering, and measurement and control. Relying on three-phase 380V power supply, it uses precise pressure control and flow monitoring to simulate different engine operating conditions and detect fuel injection pressure, spray conditions, etc. It adopts a multi-station parallel design and is equipped with pneumatic hydraulic pumps, electronic sensors, and intelligent digital display systems. It can simultaneously test the sealing performance of multiple fuel injector components, which helps to facilitate efficient mass production. By simulating real working conditions and accurately collecting data, it lays a solid foundation for fuel injector performance calibration, defect investigation, and factory quality inspection. It is the core testing equipment for all stages of fuel injector development and mass production.

[0003] When existing fuel injector test benches are idle or being transported, the components on the machine body are usually exposed to the outside, making them susceptible to damage from dust and impacts, which affects the accuracy and service life of the equipment. In addition, traditional protection methods are not easy to fix, resulting in inconvenient opening and closing, and unstable protection during transportation. Therefore, they cannot meet the protection requirements when idle or being transported. Utility Model Content

[0004] To address the problems mentioned in the background art, the purpose of this utility model is to provide a test bench for fuel injector production. This bench provides reliable protection for the components, preventing dust corrosion and collisions, while also offering the advantages of convenient opening and closing and stable fixation. It solves the problems of existing fuel injector test benches where, when idle or during transport, the components are usually exposed and susceptible to damage from dust and impacts, affecting equipment accuracy and service life. Furthermore, traditional protection methods are difficult to fix, resulting in inconvenient opening and closing, and unstable protection during transport, failing to meet protection requirements during idleness and transport.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A test bench for producing fuel injectors includes a body, a measuring cylinder assembly, and a connecting and positioning component. The measuring cylinder assembly is fixedly connected to the upper front end of the body, and the connecting and positioning component is fixedly connected to the upper end of the measuring cylinder assembly. A protective device is provided on the front side of the upper end of the body, and a fixing device is provided on the lower front end of the protective device.

[0006] The fixing device includes a box body, locking components, pressing components, and linkage control components. The box body is fixedly connected to the lower side of the front surface of the machine body. There are two locking components, which are respectively arranged on the left and right sides of the upper part of the box body. There are two pressing components, which are respectively arranged at the lower ends of the two locking components. The linkage control components are arranged at the rear side of the lower ends of the two pressing components.

[0007] As a preferred embodiment of this utility model, the protective device includes a protective cover, an observation window, an explosion-proof glass, and rotating parts. The protective cover is fitted onto the upper front side of the machine body and is movably connected to the machine body. The observation window is opened on the upper front side of the protective cover. The explosion-proof glass is fixedly connected inside the observation window. There are two rotating parts, which are respectively arranged on the left and right sides of the rear end of the protective cover.

[0008] In a preferred embodiment of this utility model, the rotating component includes a rotating seat, a rotating shaft, and a rotating block. The rotating seat is fixedly connected to the upper end of the rear surface of the machine body. The rotating shaft is disposed inside the rotating seat, and its left and right ends are respectively fixedly connected to the left and right sides inside the rotating seat. The lower end of the rotating block is sleeved on the surface of the rotating shaft and is rotatably connected to the rotating shaft. The upper end of the rotating block is fixedly connected to the protective cover.

[0009] As a preferred embodiment of this utility model, a locking head is fixedly connected to the lower front end of the protective cover, and the locking head corresponds to and is compatible with the locking component.

[0010] In a preferred embodiment of this invention, the locking assembly includes a moving rod, a lock head, and a push spring. There are two moving rods, both located on the right side of the upper part of the box. The right ends of both moving rods extend out of the box and are slidably connected to it. The lock head is located on the right side of the box and is fixedly connected to the left ends of the two moving rods. There are two push springs, each sleeved on the surface of one of the two moving rods. The left and right ends of the two push springs are fixedly connected to the right side of the lock head and the right surface of the box, respectively.

[0011] In a preferred embodiment of this invention, the extrusion member includes a bent member and an extrusion groove. The bent member is fixedly connected to the lower surface of the lock head, and the extrusion groove is formed on the lower left side of the bent member.

[0012] As a preferred embodiment of this utility model, the linkage control component includes a slide rod, a slider, a pressure rod, and a pull button. There are two slide rods, which are respectively fixedly connected to the left and right sides of the lower surface inside the box. The slider is sleeved on the upper surface of the two slide rods and is slidably connected to the slide rods. There are two pressure rods, which are respectively fixedly connected to the left and right sides of the front surface of the slider. The front ends of the two pressure rods extend into the two extrusion grooves and are slidably connected to the extrusion grooves.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. This utility model solves the problem that existing fuel injector test benches, when idle or transported, are prone to damage from dust and impacts due to exposed components, which affect the accuracy and service life of the equipment. This is achieved by using a combination of a machine body, measuring cylinder assembly, connecting and positioning components, protective device, protective cover, observation window, explosion-proof glass, rotating parts, rotating seat, rotating shaft, rotating block, fixing device, box, locking component, moving rod, lock head, push spring, extrusion part, bending part, extrusion groove, linkage control component, slide rod, slider, pressure rod, pull button, and clamp. Furthermore, traditional protective methods are difficult to fix, resulting in inconvenient opening and closing, and unstable protection during transport. These methods fail to meet protection requirements during idleness and transport.

[0015] 2. This utility model, through the combination of protective and fixing devices, provides reliable protection for the components on the machine body when the equipment is idle or being transported, preventing the components on the upper part of the machine body from being corroded and contaminated by dust and other debris when idle, and preventing the components on the upper part of the machine body from being bumped during transport. At the same time, it enables the protective cover to open and close quickly and be stably fixed, improving the safety and convenience of transporting the equipment when it is idle. Meanwhile, the explosion-proof glass can effectively resist external impacts, and the observation window allows for real-time monitoring of the status of the components at the front of the machine body.

[0016] 3. By setting a fixing device, this utility model realizes quick locking and unlocking between the protective cover and the machine body, which improves the convenience of equipment operation. At the same time, by utilizing the elastic reset characteristics of the push spring and the compression transmission of the linkage control component and the extrusion component, it can not only ensure the connection stability of the protective cover in the protective state, effectively enhance the protective reliability of the equipment during idle or transportation, but also facilitate subsequent opening and use. Attached Figure Description

[0017] Figure 1 This is a first-view structural schematic diagram of the test bench of this utility model;

[0018] Figure 2 A schematic diagram of the structure for the protective cover to rotate and open;

[0019] Figure 3This is a schematic diagram of the test bench from a second-view perspective.

[0020] Figure 4 This is a schematic diagram of the fixing device;

[0021] Figure 5 This is a schematic diagram of the exploded structure of the fixed device;

[0022] Figure 6 This is a schematic diagram of the rotating component.

[0023] In the diagram: 1. Machine body; 2. Measuring cylinder assembly; 3. Connecting and positioning assembly; 4. Protective device; 41. Protective cover; 42. Observation window; 43. Explosion-proof glass; 44. Rotating component; 441. Rotating seat; 442. Rotating shaft; 443. Rotating block; 5. Fixing device; 51. Box body; 52. Locking assembly; 521. Moving rod; 522. Lock head; 523. Push spring; 53. Extrusion component; 531. Bending component; 532. Extrusion groove; 54. Linkage control assembly; 541. Slide rod; 542. Slider; 543. Pressure rod; 544. Pull button; 6. Clamp head. Detailed Implementation

[0024] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0025] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0027] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include the three-dimensional spatial dimensions of length, width, and depth.

[0028] Example 1

[0029] Reference Figure 1-6This is the first embodiment of the present utility model, which provides a test bench for the production of fuel injectors, including a machine body 1, a measuring cylinder group 2 and a connecting and positioning component 3. The measuring cylinder group 2 is fixedly connected to the upper front end of the machine body 1, and the connecting and positioning component 3 is fixedly connected to the upper end of the measuring cylinder group 2. A protective device 4 is provided on the upper front side of the machine body 1, and a fixing device 5 is provided on the lower front end of the protective device 4.

[0030] The fixing device 5 includes a box body 51, locking components 52, pressing components 53 and linkage control components 54. The box body 51 is fixedly connected to the lower side of the front surface of the machine body 1. There are two locking components 52, which are respectively located on the left and right sides of the upper part of the box body 51. There are two pressing components 53, which are respectively located at the lower end of the two locking components 52. The linkage control components 54 are located at the rear side of the lower end of the two pressing components 53.

[0031] Specifically, by setting up the protective device 4 and the fixing device 5 together, reliable protection is provided for the parts on the machine body 1 when the equipment is idle or being transported, so as to prevent the parts on the upper part of the machine body 1 from being corroded and contaminated by dust and other debris when idle, and to prevent the parts on the upper part of the machine body 1 from being bumped during transport. At the same time, the protective cover 41 can be quickly opened and closed and stably fixed, improving the safety and convenience of the equipment during idle transport. Meanwhile, the explosion-proof glass 43 can effectively resist external impacts, and the observation window 42 can facilitate real-time viewing of the status of the front parts of the machine body 1.

[0032] Furthermore, when idle or being transported, the protective cover 41 can be rotated forward and closed by rotating component 44, so that the protective cover 41 is fitted onto the upper front side of the machine body 1 to protect the parts on the machine body 1. At the same time, when closed, the two locking components 52 cooperate with the clamping head 6 to quickly fix the protective cover 41 and ensure the stability of the outer shell. When opened later, the linkage control component 54 cooperates with the squeezing component 53 to link the two locking components 52 to open and close, quickly releasing the fixation of the protective cover 41, and then the protective cover 41 can be rotated open again.

[0033] Example 2

[0034] The second embodiment of this utility model provides a test bench for producing fuel injectors. The protective device 4 includes a protective cover 41, an observation window 42, an explosion-proof glass 43, and rotating parts 44. The protective cover 41 is fitted on the upper front side of the machine body 1 and is movably connected to the machine body 1. The observation window 42 is opened on the upper front side of the protective cover 41. The explosion-proof glass 43 is fixedly connected inside the observation window 42. There are two rotating parts 44, which are respectively arranged on the left and right sides of the rear end of the protective cover 41.

[0035] The rotating component 44 includes a rotating seat 441, a rotating shaft 442, and a rotating block 443. The rotating seat 441 is fixedly connected to the upper end of the rear surface of the machine body 1. The rotating shaft 442 is located inside the rotating seat 441, and its left and right ends are fixedly connected to the left and right sides inside the rotating seat 441, respectively. The lower end of the rotating block 443 is sleeved on the surface of the rotating shaft 442 and is rotatably connected to the rotating shaft 442. The upper end of the rotating block 443 is fixedly connected to the protective cover 41.

[0036] A clip 6 is fixedly connected to the lower front end of the protective cover 41. The clip 6 and the locking component 52 are in corresponding and compatible positions.

[0037] Specifically, by setting up the protective device 4, the protective cover 41 can be opened and closed flexibly with the help of the rotating part 44. With the locking head 6 and the locking component 52, a closed protective structure is formed for the front part of the machine body 1. This not only allows the operator to check the equipment status in real time through the observation window 42 and the explosion-proof glass 43, but also effectively isolates external dust, impact and other adverse factors when the equipment is idle or being transported.

[0038] Furthermore, when the protective cover 41 is rotated downwards to close it, the rotating cover 41 rotates and drives the rotating block 443 to rotate on the surface of the rotating shaft 442 inside the rotating seat 441. At the same time, it drives the clip 6 at the lower front end of the protective cover 41 to insert into the inside of the box 51 to press against the lock head 522 and engage with the two locking components 52 to fix the protective cover 41.

[0039] Example 3

[0040] The third embodiment of this utility model provides a test bench for fuel injector production. The locking assembly 52 includes a moving rod 521, a lock head 522, and a push spring 523. There are two moving rods 521, both of which are located on the right side of the upper part of the box 51. The right ends of the two moving rods 521 extend out of the box 51 and are slidably connected to the box 51. The lock head 522 is located on the right side of the box 51 and is fixedly connected to the left end of the two moving rods 521. There are two push springs 523, which are respectively sleeved on the surface of the two moving rods 521. The left and right ends of the two push springs 523 are fixedly connected to the right side of the lock head 522 and the right surface of the box 51, respectively.

[0041] The extrusion part 53 includes a bent part 531 and an extrusion groove 532. The bent part 531 is fixedly connected to the lower surface of the lock head 522, and the extrusion groove 532 is opened on the lower left side of the bent part 531.

[0042] The linkage control component 54 includes a slide bar 541, a slider 542, a pressure bar 543, and a pull button 544. There are two slide bars 541, which are fixedly connected to the left and right sides of the lower surface inside the box 51, respectively. The slider 542 is sleeved on the upper surface of the two slide bars 541 and is slidably connected to the slide bars 541. There are two pressure bars 543, which are fixedly connected to the left and right sides of the front surface of the slider 542, respectively. The front ends of the two pressure bars 543 extend into the two extrusion grooves 532 and are slidably connected to the extrusion grooves 532.

[0043] Specifically, by setting the fixing device 5, the quick locking and unlocking between the protective cover 41 and the machine body 1 is realized, which improves the convenience of equipment operation. At the same time, by utilizing the elastic reset characteristics of the push spring 523 and the compression transmission between the linkage control component 54 and the pressing component 53, the connection stability of the protective cover 41 in the protective state can be ensured, effectively enhancing the protective reliability of the equipment during idle or transportation, and facilitating subsequent opening and use.

[0044] Furthermore, when the protective cover 41 is rotated and closed for protection, the locking head 6 is inserted into the box 51 as the protective cover 41 is closed downwards, squeezing the two locking heads 522 inside the box 51. This causes the locking heads 522 to move to the left and right sides under pressure. At the same time, the two moving rods 521 move outwards from the box 51, which supports and stabilizes the locking heads 522. Simultaneously, the movement of the locking heads 522 counteracts the elastic force of the push spring 523, squeezing the push spring 523. After the protective cover 41 is completely rotated and closed, the position of the locking head 6 no longer squeezes the locking heads 522. At this time, the push spring 523 will rebound and push the two locking heads 522 together to engage the locking head 6 and fix the protective cover 41.

[0045] When opening the protective cover 41, pull the button 544 forward and slide it. The slider 542 moves upward on the surface of the slider 541, which drives the two pressure rods 543 to move upward inside the two extrusion grooves 532 and extrude the inner wall of the extrusion grooves 532. This causes the two bent parts 531 to be extruded, which in turn causes the two locking heads 522 to move to the left and right sides to open, thereby releasing the jamming and releasing the fixation of the protective cover 41. Then, rotate it upward to open the protective cover 41.

[0046] Working principle:

[0047] When idle or being transported, the protective cover 41 is rotated downwards to close it. As the protective cover 41 rotates, the rotating block 443 rotates on the surface of the rotating shaft 442 inside the rotating seat 441. At the same time, the locking head 6 at the lower front end of the protective cover 41 is inserted into the box 51. As the protective cover 41 closes downwards and is inserted into the box 51, the locking head 6 presses against the two locking heads 522 inside the box 51, causing the locking heads 522 to move to the left and right sides. At the same time, the two moving rods 521 move outwards from the box 51, which supports and stabilizes the locking heads 522. Meanwhile, the movement of the locking heads 522 counteracts the spring force of the push spring 523 and presses against the push spring 523. After the protective cover 41 is fully rotated and closed, the locking head 6 no longer presses against the locking heads 522. At this time, the push spring 523 will rebound and push the two locking heads 522 together to engage the locking head 6 and fix the protective cover 41, thus completing the closing and fixing work for protection.

[0048] When opening the protective cover 41, pull the button 544 forward and slide it. The slider 542 moves upward on the surface of the slider 541, which drives the two pressure rods 543 to move upward inside the two extrusion grooves 532 and extrude the inner wall of the extrusion grooves 532. This causes the two bent parts 531 to be extruded, which in turn causes the two locking heads 522 to move to the left and right sides to open, thereby releasing the jamming and releasing the fixation of the protective cover 41. Then, rotate it upward to open the protective cover 41.

[0049] In summary, by using the combined components of the machine body 1, measuring cylinder group 2, connecting and positioning assembly 3, protective device 4, protective cover 41, observation window 42, explosion-proof glass 43, rotating part 44, rotating seat 441, rotating shaft 442, rotating block 443, fixing device 5, box body 51, locking assembly 52, moving rod 521, lock head 522, push spring 523, pressing part 53, bending part 531, pressing groove 532, linkage control assembly 54, slide rod 541, slider 542, pressure rod 543, pull button 544, and clamp 6, reliable protection of the components on the test bench is achieved, preventing dust corrosion and collisions, while also providing convenient opening and closing and stable fixation.

[0050] It should be noted that the machine body 1, the measuring cylinder group 2 and the connecting positioning component 3 are existing devices or equipment in the prior art, or are devices or equipment that can be implemented by the prior art. The power supply, connection method, usage method, power source, fixing method, installation method, control method and other methods of the equipment, as well as the materials of each accessory and the selection of various parameters are all common knowledge in the art, and therefore will not be described in detail in this application document.

[0051] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structural equivalents but also equivalent structures. Without departing from the scope of this invention, other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0052] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to implementing the present invention) may be omitted.

[0053] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0054] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A test bench for fuel nozzle production, comprising a machine body (1), a graduated cylinder group (2) and a connecting and positioning assembly (3), the graduated cylinder group (2) being fixedly connected to the front upper end of the machine body (1), and the connecting and positioning assembly (3) being fixedly connected to the upper end of the graduated cylinder group (2), characterized in that: A protective device (4) is provided on the front side of the upper end of the body (1), and a fixing device (5) is provided on the lower side of the front end of the protective device (4). The fixing device (5) includes a box body (51), a locking component (52), a pressing component (53), and a linkage control component (54). The box body (51) is fixedly connected to the lower side of the front surface of the machine body (1). There are two locking components (52), which are respectively located on the left and right sides of the upper part of the box body (51). There are two pressing components (53), which are respectively located at the lower end of the two locking components (52). The linkage control component (54) is located at the rear side of the lower end of the two pressing components (53).

2. The test bench for producing an oil nozzle according to claim 1, characterized in that: The protective device (4) includes a protective cover (41), an observation window (42), an explosion-proof glass (43), and a rotating component (44). The protective cover (41) is fitted onto the upper front side of the body (1) and is movably connected to the body (1). The observation window (42) is opened on the upper front side of the protective cover (41). The explosion-proof glass (43) is fixedly connected inside the observation window (42). There are two rotating components (44), which are respectively located on the left and right sides of the rear end of the protective cover (41).

3. The test bench for producing an oil nozzle according to claim 2, characterized in that: The rotating component (44) includes a rotating seat (441), a rotating shaft (442), and a rotating block (443). The rotating seat (441) is fixedly connected to the upper end of the rear surface of the machine body (1). The rotating shaft (442) is disposed inside the rotating seat (441), and its left and right ends are fixedly connected to the left and right sides inside the rotating seat (441), respectively. The lower end of the rotating block (443) is sleeved on the surface of the rotating shaft (442) and rotatably connected to the rotating shaft (442). The upper end of the rotating block (443) is fixedly connected to the protective cover (41).

4. The test bench for producing an oil nozzle according to claim 2, characterized in that: The lower front end of the protective cover (41) is fixedly connected to a clip (6), and the clip (6) and the locking component (52) are in corresponding and compatible positions.

5. The test bench for producing an oil nozzle according to claim 1, characterized in that: The locking assembly (52) includes a moving rod (521), a lock head (522), and a push spring (523). There are two moving rods (521), both of which are located on the right side of the upper part of the box body (51). The right ends of the two moving rods (521) extend out of the box body (51) and are slidably connected to the box body (51). The lock head (522) is located on the right side of the box body (51) and is fixedly connected to the left end of the two moving rods (521). There are two push springs (523), which are respectively sleeved on the surface of the two moving rods (521). The left and right ends of the two push springs (523) are fixedly connected to the right side of the lock head (522) and the right surface of the box body (51) respectively.

6. The test bench for producing an oil nozzle according to claim 5, characterized in that: The extrusion member (53) includes a bending member (531) and an extrusion groove (532). The bending member (531) is fixedly connected to the lower surface of the lock head (522), and the extrusion groove (532) is formed on the lower left side of the bending member (531).

7. The test bench for producing an oil nozzle according to claim 6, characterized in that: The linkage control component (54) includes a slide bar (541), a slider (542), a pressure bar (543), and a pull button (544). There are two slide bars (541), which are fixedly connected to the left and right sides of the lower surface inside the box (51). The slider (542) is sleeved on the upper surface of the two slide bars (541) and is slidably connected to the slide bars (541). There are two pressure bars (543), which are fixedly connected to the left and right sides of the front surface of the slider (542). The front ends of the two pressure bars (543) extend into the two extrusion grooves (532) and are slidably connected to the extrusion grooves (532).

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