Detection device for durability test of automobile hanging hook

Abstract

The invention relates to the technical field of automobile equipment, and particularly discloses an automobile hanging hook durability test detection device which comprises a base frame, a fixing tool, a first tool, a second tool and a third tool. The fixing tool is mounted on the base frame, and the fixing tool is used for fixing the hanging hook assembly; the first tool is mounted on the base frame and comprises a first actuator for closing the hanging hook assembly; the first tool is installed on the base frame, the second tool is installed on the base frame, the second tool comprises a second actuator used for opening the hanging hook assembly to the position with the maximum opening degree, the third tool is installed on the base frame, the third tool comprises a third actuator and a fourth actuator, the third actuator is used for closing the hanging hook assembly to the position with the minimum opening degree, and the fourth actuator is used for closing the hanging hook assembly to the position with the minimum opening degree. And the fourth actuator is used for opening the hanging hook assembly. According to the invention, the labor intensity can be reduced, the detection efficiency can be improved, stable operation frequency and operation force can be provided, and the accuracy of test data is further ensured.

Description

Technical Field

[0001] The invention relates to the technical field of automobile equipment, and in particular to a durability performance testing device for an automobile hanging hook. Background Art

[0002] The durability test of automobile cargo hooks needs to be tested tens of thousands of times in different high and low temperature test environments according to the test standards to detect whether the parts meet the design requirements and to discover design defects at an early stage so as to optimize and improve them in time to ensure product quality.

[0003] Currently, there is no relevant equipment on the market for durability performance testing of automobile hooks. All testing is done manually, which is labor-intensive and has low test efficiency. In addition, the manual operating force and frequency are unstable, and the hooks cannot be operated in high and low temperature environments for a long time. Therefore, the test standards cannot be met and the accuracy of the test data cannot be ensured. Summary of the invention

[0004] The technical problem to be solved by the present invention is: how to reduce labor intensity and improve detection efficiency and accuracy.

[0005] In order to solve the above technical problems, the present invention provides a vehicle hanging hook durability test detection device, which has a first direction, a second direction and a third direction intersecting in pairs, including:

[0006] Scaffolding;

[0007] A fixing tool, the fixing tool is installed on the base frame, and the fixing tool is used to fix the hanging hook assembly;

[0008] a first tool, the first tool being mounted on the base frame, the first tool comprising a first actuator for closing the object hanging hook assembly in the third direction;

[0009] a second tooling, the second tooling being mounted on the base frame, the second tooling comprising a second actuator for opening the hanging hook assembly to a maximum opening position, and the second actuator and the first actuator being arranged opposite to each other in the third direction; and

[0010] The third tooling is installed on the base frame, and the third tooling includes a third actuator and a fourth actuator. The third actuator is used to close the hanging hook assembly to the minimum opening position in the first direction, and the fourth actuator is used to open the hanging hook assembly in the first direction.

[0011] Further preferably, the fixing tool comprises a second stand extending along the third direction, the second stand is provided with a mounting plate, and the hanging hook assembly is mounted on the mounting plate;

[0012] Wherein, the hanging hook assembly includes a hanging hook, and the hanging hook is arranged at a first loading point and a second loading point.

[0013] Further preferably, the first tooling further comprises:

[0014] a first frame extending along the third direction, the first frame being connected to the base frame, and the first frame being provided with a truss extending along the first direction;

[0015] a first slide rail, the first slide rail being disposed on the truss along the first direction; and

[0016] The first hinge is slidably mounted on the first slide rail, and the first actuator is hinged to the first slide rail.

[0017] Further preferably, a first force sensor is provided at the output end of the first actuator, and a first rope is connected between the first force sensor and the first loading point.

[0018] Further preferably, the second tooling further comprises:

[0019] A second slide rail provided on the base frame and extending along the first direction; and

[0020] The second hinge is slidably disposed on the second slide rail, and the second actuator is hinged to the second hinge.

[0021] Further preferably, a second force sensor is provided at the output end of the second actuator, and a second rope is connected between the second force sensor and the first loading point.

[0022] Further preferably, the third tooling further includes:

[0023] A third stand, the third stand extending along the third direction and disposed on the base frame; and

[0024] The third slide rail is arranged on the third stand along the third direction, and the third actuator and the fourth actuator are respectively slidably connected to the third slide rail.

[0025] Further preferably, the third tooling further includes:

[0026] a third hinge, the third hinge being slidably mounted on the third slide rail, the third actuator being connected to the third hinge;

[0027] a third force sensor, the third force sensor being disposed at an output end of the third actuator; and

[0028] A first buffer block, wherein the first buffer block is connected to the third force sensor, and the first buffer block corresponds to the first loading point in the first direction.

[0029] Further preferably, the third tooling further includes:

[0030] a fourth hinge, the fourth hinge being slidably mounted on the third slide rail, the fourth actuator being connected to the fourth hinge;

[0031] a fourth force sensor, the fourth force sensor being disposed at an output end of the fourth actuator; and

[0032] A second buffer block, wherein the second buffer block is connected to the fourth force sensor, and the second buffer block corresponds to the second loading point in the first direction.

[0033] Further preferably, it further comprises a PLC programmable control system, and the first actuator, the second actuator, the third actuator and the fourth actuator are all controlled by the PLC programmable control system.

[0034] Compared with the prior art, the durability performance test device for a vehicle hanging hook provided by the present invention has the following beneficial effects:

[0035] The present invention can simulate manual testing of automobile cargo hooks. On the one hand, it can reduce labor intensity and improve detection efficiency; on the other hand, it can replace manual operation in high and low temperature environments for a long time and meet the requirements of test standards. Specifically, the present invention can fix the cargo hook assembly by setting a fixed tool, and perform opening or closing detection on the cargo hook assembly through the first tool, the second tool and the third tool, and can provide a stable operating frequency and operating force by using the first actuator, the second actuator, the third actuator and the fourth actuator, thereby further ensuring the accuracy of the test data. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a structural schematic diagram of the durability performance test detection device for automobile hanging hooks of the present invention.

[0037] Figure 2 It is a front view of the durability performance test detection device for automobile hanging hooks of the present invention.

[0038] Figure 3 It is a side view of the durability performance test detection device for automobile hanging hooks of the present invention.

[0039] Figure 4 It is a top view of the durability performance test detection device for automobile hanging hooks of the present invention.

[0040] Reference numerals:

[0041] 1. Base frame;

[0042] 2. first tooling; 21. first stand; 22. truss; 23. first slide rail; 24. first actuator; 25. first hinge; 26. first force sensor; 27. first rope;

[0043] 3. Fixing tooling; 31. Second stand; 32. Mounting plate; 33. Hanging hook assembly; 34. Hanging hook; 35. First loading point; 36. Second loading point;

[0044] 4. second tooling; 41. second slide rail; 42. second actuator; 43. second hinge; 44. second force sensor; 45. second rope;

[0045] 5. The third tooling; 51. The third stand; 52. The third slide rail; 53. The third actuator; 54. The third hinge; 55. The third force sensor; 56. The first buffer block; 57. The fourth actuator; 58. The fourth hinge; 59. The fourth force sensor; 510. The second buffer block. DETAILED DESCRIPTION

[0046] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0047] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like used in the present invention to indicate the orientation or position relationship is based on the orientation or position relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0048] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0049] In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0051] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0052] like Figure 1-Figure 4 As shown, this embodiment provides a vehicle hook durability test detection device, which has a first direction X, a second direction Y and a third direction Z that intersect each other.

[0053] In other embodiments, the first direction X, the second direction Y, and the third direction Z intersect each other perpendicularly.

[0054] In a specific embodiment, the durability performance test device for automobile hooks includes a base frame 1, a fixed fixture 3, a first fixture 2, a second fixture 4 and a third fixture 5; wherein the fixed fixture 3, the first fixture 2, the second fixture 4 and the third fixture 5 are all installed on the base frame 1; the fixed fixture 3 is used to fix the hook assembly 33. This embodiment can simulate manual testing of automobile hooks through the first fixture 2, the second fixture 4 and the third fixture 5, which can reduce labor intensity and improve detection efficiency on the one hand; on the other hand, it can replace manual operation in high and low temperature environments for a long time and meet the requirements of the test standards.

[0055] In a specific embodiment, the first fixture 2 is installed on the base frame 1, and the first fixture 2 includes a first actuator 24 for closing the object hook assembly 33 in the third direction Z; the second fixture 4 includes a second actuator 42 for opening the object hook assembly 33 to the maximum opening position, and the second actuator 42 and the first actuator 24 are arranged opposite to each other in the third direction Z; the third fixture 5 includes a third actuator 53 and a fourth actuator 57, the third actuator 53 is used to close the object hook assembly 33 to the minimum opening position in the first direction X, and the fourth actuator 57 is used to open the object hook assembly 33 in the first direction X. In this embodiment, the first fixture 2, the second fixture 4 and the third fixture 5 are used to detect whether the object hook assembly 33 is opened or closed, and the first actuator 24, the second actuator 42, the third actuator 53 and the fourth actuator 57 can provide a stable operating frequency and operating force, thereby ensuring the accuracy of the test data.

[0056] In some embodiments, the fixed tool 3 includes a second frame 31 extending along the third direction Z, the second frame 31 is provided with a mounting plate 32, and the hanging hook assembly 33 is installed on the mounting plate 32; wherein, the hanging hook assembly 33 includes a hanging hook 34, and the hanging hook 34 is provided with a first loading point 35 and a second loading point 36.

[0057] In some embodiments, two second stands 31 are preferably provided on the base frame 1 in parallel with each other, and the mounting plate 32 is connected between the two second stands 31 .

[0058] In some embodiments, the first tooling 2 further includes a first stand 21, a first slide rail 23, and a first hinge 25; wherein the first stand 21 extends along the third direction Z, the first stand 21 is connected to the base frame 1, and the first stand 21 is provided with a truss 22 extending along the first direction X; the first slide rail 23 is provided on the truss 22 along the first direction X; the first hinge 25 is slidably mounted on the first slide rail 23, and the first actuator 24 is hinged to the first slide rail 23. Thus, by providing the first slide rail 23 and the first hinge 25, the first actuator 24 can move along the first direction X to achieve position adjustment, so as to meet the test and detection of automobile hooks of different sizes or models, and has a wide range of applications.

[0059] In some embodiments, a first force sensor 26 is provided at the output end of the first actuator 24, and a first rope 27 is connected between the first force sensor 26 and the first loading point 35; when the output end of the first actuator 24 contracts, the hanging hook 34 can be closed through the first rope 27 and the first loading point 35, and at the same time, the first force sensor 26 detects the tension of the first rope 27 in real time to ensure that the first actuator 24 can provide a stable operating frequency and operating force, thereby ensuring the accuracy of the test data.

[0060] In some embodiments, the second tooling 4 further includes a second slide rail 41 and a second hinge 43; wherein the second slide rail 41 extends along the first direction X and is disposed on the base frame 1; the second hinge 43 is slidably disposed on the second slide rail 41, and the second actuator 42 is hinged to the second hinge 43. Similarly, by providing the second slide rail 41 and the second hinge 43, the second actuator 42 can be moved along the first direction X to achieve position adjustment, so as to meet the requirements of testing and inspecting automobile hooks of different sizes or models, and has a wide range of applications.

[0061] In some embodiments, a second force sensor 44 is provided at the output end of the second actuator 42, and a second rope 45 is connected between the second force sensor 44 and the first loading point 35. When the output end of the second actuator 42 contracts, the object hanging hook 34 is opened to the maximum opening position through the second rope 45 and the first loading point 35, and the second force sensor 44 detects the tension of the second rope 45 in real time, so as to ensure that the second actuator 42 can provide a stable operating frequency and operating force, thereby ensuring the accuracy of the test data.

[0062] In some embodiments, the third tooling 5 also includes a third stand 51 and a third slide rail 52; wherein, the third stand 51 is extended along the third direction Z and is arranged on the base frame 1; the third slide rail 52 is arranged on the third stand 51 along the third direction Z, and the third actuator 53 and the fourth actuator 57 are respectively slidably connected to the third slide rail 52, so that the third actuator 53 and the fourth actuator 57 can move along the third direction Z to achieve position adjustment, so as to meet the test and inspection of automobile hooks of different sizes or models, and has a wide range of applications.

[0063] In some embodiments, the third tooling 5 further includes a third hinge 54, a third force sensor 55 and a first buffer block 56; the third hinge 54 is slidably mounted on the third slide rail 52, and the third actuator 53 is connected to the third hinge 54; the third force sensor 55 is disposed at the output end of the third actuator 53; the first buffer block 56 is connected to the third force sensor 55, and the first buffer block 56 corresponds to the first loading point 35 in the first direction X. When the output end of the third actuator 53 extends, the first loading point 35 of the object hanging hook 34 is driven by the first buffer block 56 and the third force sensor 55 to close the object hanging hook 34 to the minimum opening position. During this process, the third force sensor 55 detects the pressure of the first buffer block 56 in real time to ensure that the third actuator 53 can provide a stable operating frequency and operating force, thereby ensuring the accuracy of the test data.

[0064] In some embodiments, the third tooling 5 further includes a fourth hinge 58, a fourth force sensor 59, and a second buffer block 510; the fourth hinge 58 is slidably mounted on the third slide rail 52, and the fourth actuator 57 is connected to the fourth hinge 58; the fourth force sensor 59 is disposed at the output end of the fourth actuator 57; the second buffer block 510 is connected to the fourth force sensor 59, and the second buffer block 510 corresponds to the second loading point 36 in the first direction X. When the output end of the fourth actuator 57 extends, the second loading point 36 of the object hanging hook 34 is driven by the fourth force sensor 59 and the second buffer block 510 to open the object hanging hook 34. During this process, the fourth actuator 57 detects the pressure of the second buffer block 510 in real time to ensure that the fourth actuator 57 can provide a stable operating frequency and operating force, thereby ensuring the accuracy of the test data.

[0065] In some embodiments, a PLC programmable control system is also included, and the first actuator 24, the second actuator 42, the third actuator 53 and the fourth actuator 57 are all controlled by the PLC programmable control system. Specifically, the PLC programmable control system is set with a control instruction, which can send the control instruction to the first actuator 24, the second actuator 42, the third actuator 53 or the fourth actuator 57, so that the first actuator 24, the second actuator 42, the third actuator 53 or the fourth actuator 57 can complete the corresponding action. In this way, it can replace manual labor to reduce labor intensity and improve detection efficiency, and can also operate in high and low temperature environments for a long time to meet the requirements of test standards.

[0066] In some embodiments, the base frame 1, the first upright frame 21, the second upright frame 31 and the third upright frame 51 are all made of aluminum profiles to facilitate the assembly of the entire device. At the same time, the position of the first actuator 24, the second actuator 42, the third actuator 53 or the fourth actuator 57 can be adjusted to meet the performance test of the cargo hooks of various vehicle models.

[0067] In some embodiments, the first actuator 24 , the second actuator 42 , the third actuator 53 , and the fourth actuator 57 may be air cylinders or oil cylinders.

[0068] The working process of the present invention is: please combine Figure 1-Figure 4After the object hanging hook assembly 33 is fixed to the mounting plate 32, the actions of the first actuator 24, the second actuator 42, the third actuator 53 and the fourth actuator 57 are respectively controlled by the PLC programmable control system; specifically, the object hanging hook assembly 33 is fixed to the mounting plate 32, firstly, the output end of the fourth actuator 57 is controlled to extend through the PLC programmable control system, and the second loading point 36 of the object hanging hook 34 is driven through the fourth force sensor 59 and the second buffer block 510 to open the object hanging hook 34, and the output end of the fourth actuator 57 is retracted and reset; secondly, the output end of the second actuator 42 is controlled to retract through the PLC programmable control system, and the object hanging hook 34 is opened to the maximum opening position through the second rope 45 and the first loading point 35, and the output end of the second actuator 42 is extended and reset. In this process, the second force sensor 59 and the second buffer block 510 are driven to the second loading point 36 of the object hanging hook 34 to open the object hanging hook 34, and the output end of the fourth actuator 57 is retracted and reset. The sensor 44 detects the tension of the second rope 45 in real time; then, the output end of the first actuator 24 is controlled to contract through the PLC programmable control system, and the hanging hook 34 is closed through the first rope 27 and the first loading point 35. At the same time, the output end of the first actuator 24 is extended and reset. During this process, the first force sensor 26 detects the tension of the first rope 27 in real time; finally, the output end of the third actuator 53 is controlled to extend through the PLC programmable control system, and the first loading point 35 of the hanging hook 34 is driven to close the hanging hook 34 to the minimum opening position through the first buffer block 56 and the third force sensor 55. After the end, the output end of the third actuator 53 is contracted and reset; according to this cyclic operation control, the durability performance test of the automobile hanging hook is realized. In each step of the action operation of each actuator, the corresponding force sensor detects the loading force value in real time.

[0069] In summary, the present invention provides a vehicle cargo hook durability performance test and detection device, which can simulate manual testing of the vehicle cargo hook. On the one hand, it can reduce labor intensity and improve detection efficiency; on the other hand, it can replace manual operation in high and low temperature environments for a long time to meet the test standard requirements; specifically, the present invention can fix the cargo hook assembly 33 by setting a fixing tool 3, and perform opening or closing detection on the cargo hook assembly 33 through the first tool 2, the second tool 4 and the third tool 5, and use the first actuator 24, the second actuator 42, the third actuator 53 and the fourth actuator 57 to provide a stable operating frequency and operating force, thereby further ensuring the accuracy of the test data.

[0070] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be regarded as the protection scope of the present invention. The basic principles, main features and advantages of the present invention are shown and described above. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above preferred embodiments. The embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, so it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention.

[0071] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A vehicle hook durability test device, having a first direction (X), a second direction (Y) and a third direction (Z) intersecting each other, characterized in that: include: Base frame (1); A fixing tool (3), the fixing tool (3) being installed on the base frame (1), and the fixing tool (3) being used to fix the hanging hook assembly (33); A first tool (2), the first tool (2) being mounted on the base frame (1), the first tool (2) comprising a first actuator (24) for closing the object hanging hook assembly (33) in the third direction (Z); a second tool (4), the second tool (4) being mounted on the base frame (1), the second tool (4) comprising a second actuator (42) for opening the hanging hook assembly (33) to a maximum opening position, and the second actuator (42) and the first actuator (24) being arranged relative to each other in the third direction (Z); as well as A third tooling (5), the third tooling (5) being mounted on the base frame (1), the third tooling (5) comprising a third actuator (53) and a fourth actuator (57), the third actuator (53) being used to close the object hanging hook assembly (33) to a minimum opening position in the first direction (X), and the fourth actuator (57) being used to open the object hanging hook assembly (33) in the first direction (X).

2. The durability performance test device for automobile hanging hook according to claim 1, characterized in that: The fixing tool (3) comprises a second stand (31) extending along the third direction (Z), a mounting plate (32) is provided on the second stand (31), and the hanging hook assembly (33) is mounted on the mounting plate (32); The object hanging hook assembly (33) comprises an object hanging hook (34), and the object hanging hook (34) is provided at a first loading point (35) and a second loading point (36).

3. The durability test device for automobile hanging hook according to claim 1, characterized in that: The first tool (2) also includes: a first stand (21) extending along the third direction (Z), the first stand (21) being connected to the base frame (1), and the first stand (21) being provided with a truss (22) extending along the first direction (X); a first slide rail (23), the first slide rail (23) being arranged on the truss (22) along the first direction (X); and A first hinge (25), wherein the first hinge (25) is slidably mounted on the first slide rail (23), and the first actuator (24) is hingedly connected to the first slide rail (23).

4. The durability test device for a vehicle hanging hook according to claim 2, characterized in that: A first force sensor (26) is provided at the output end of the first actuator (24), and a first rope (27) is connected between the first force sensor (26) and the first loading point (35).

5. The durability test device for automobile hanging hook according to claim 1, characterized in that: The second tool (4) also includes: a second slide rail (41) extending along the first direction (X) and arranged on the base frame (1); and The second hinge (43) is slidably disposed on the second slide rail (41), and the second actuator (42) is hingedly connected to the second hinge (43).

6. The durability test device for automobile hanging hook according to claim 2, characterized in that: A second force sensor (44) is provided at the output end of the second actuator (42), and a second rope (45) is connected between the second force sensor (44) and the first loading point (35).

7. The durability test device for automobile hanging hook according to claim 2, characterized in that: The third tool (5) further comprises: a third stand (51), the third stand (51) extending along the third direction (Z) and arranged on the base frame (1); and A third slide rail (52), wherein the third slide rail (52) is arranged on the third stand (51) along the third direction (Z), and the third actuator (53) and the fourth actuator (57) are respectively slidably connected to the third slide rail (52).

8. The durability test device for automobile hanging hook according to claim 7, characterized in that: The third tool (5) further comprises: a third hinge (54), the third hinge (54) being slidably mounted on the third slide rail (52), and the third actuator (53) being connected to the third hinge (54); a third force sensor (55), the third force sensor (55) being arranged at an output end of the third actuator (53); and A first buffer block (56), the first buffer block (56) is connected to the third force sensor (55), and the first buffer block (56) corresponds to the first loading point (35) in the first direction (X).

9. The durability test device for automobile hanging hook according to claim 7, characterized in that: The third tool (5) further comprises: a fourth hinge (58), the fourth hinge (58) being slidably mounted on the third slide rail (52), the fourth actuator (57) being connected to the fourth hinge (58); a fourth force sensor (59), the fourth force sensor (59) being disposed at an output end of the fourth actuator (57); and A second buffer block (510), the second buffer block (510) is connected to the fourth force sensor (59), and the second buffer block (510) corresponds to the second loading point (36) in the first direction (X).

10. The durability test device for automobile hanging hook according to claim 1, characterized in that: It also includes a PLC programmable control system, and the first actuator (24), the second actuator (42), the third actuator (53) and the fourth actuator (57) are all controlled by the PLC programmable control system.

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