Hoisting and transferring equipment for precast concrete component production
By designing a lifting and transfer equipment for the production of prefabricated concrete components, and using transverse movement and lifting mechanisms to achieve automated lifting and transfer, the problems of low lifting efficiency and component damage during the production process are solved, and efficient and safe component transfer is achieved.
Patent Information
- Application Number
- CN202411902551.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2025-03-25
AI Technical Summary
In the production process of concrete prefabricated components, the lifting transfer efficiency is low and it is easy to cause damage to the components, making it difficult to avoid damage and improve efficiency at the same time.
A lifting and transfer equipment including a base, a carrier frame, a transverse movement mechanism and a lifting mechanism is designed. The lateral movement of the carrier frame is realized through the transverse movement mechanism, and the lifting mechanism realizes vertical lifting of concrete components, automating the entire process, improving efficiency and reducing the risk of damage.
It effectively avoids damage to concrete components during the transfer process, improves lifting and transfer efficiency, and can transfer the next one immediately after one piece is produced, significantly improving production efficiency.
Smart Images

Figure CN119683517A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of prefabricated component production equipment, and in particular to a hoisting and transferring equipment for the production of prefabricated concrete components. Background Art
[0002] At present, precast concrete components refer to concrete components that are prefabricated and cured in accordance with design requirements in factories or construction sites. After being manufactured, these components are transported to the construction site and installed in place to construct buildings or other structures. Therefore, precast concrete components are used in a variety of scenarios, such as structural components of high-rise buildings, such as beams, columns and floor slabs; precast bridge panels and piers in bridge engineering; municipal engineering, such as pipe galleries and underground passages; in prefabricated buildings, wall panels and stairs are commonly used precast components. It can be seen that precast concrete components have become an important part of the construction of buildings and structures.
[0003] Precast concrete components have the advantages of factory production, high efficiency, green environmental protection, diversity, and reusability. At the same time, they also inevitably have the disadvantages of high transportation and hoisting costs and difficulty in quality control of joints. In related technologies, the solutions to the shortcomings of precast concrete components usually include reasonable planning of transportation routes, use of professional equipment, modular design, customized production, use of flexible molds, regular maintenance and inspection, etc.
[0004] There are still some problems in the hoisting of precast concrete components during the production process, such as component damage, component balance, safety hazards, and low hoisting efficiency. The above problems in the hoisting of precast concrete components during the production process have been solved to a certain extent. However, in the production process of precast concrete components, the problem of how to avoid component damage and improve the hoisting and transfer efficiency at the same time has not been well solved. Summary of the invention
[0005] In order to effectively avoid damage to precast concrete components during production while also improving the efficiency of hoisting and transfer, the present application provides a hoisting and transfer device for the production of precast concrete components.
[0006] The present application provides a hoisting and transfer equipment for the production of prefabricated concrete components, which adopts the following technical solution: A hoisting and transferring device for the production of prefabricated concrete components, comprising: A machine base is arranged on the ground, and a control panel is arranged on the machine base; A carrier frame, slidably connected to the base; A transverse movement mechanism, disposed on the machine base, capable of causing the hanging assembly to move transversely, and electrically connected to the control panel; and A lifting mechanism is arranged on the supporting frame, the lifting mechanism can be lifted vertically on the supporting frame, and the lifting mechanism is electrically connected to the control panel.
[0007] By adopting the above technical scheme, the hoisting and transferring equipment of the present application is configured as a combination of a machine base, a bearing frame, a transverse movement mechanism, and a lifting mechanism. When the precast concrete components are to be hoisted and transferred, the bearing frame can be moved laterally under the action of the transverse movement mechanism, and the equipment can lift the concrete components in the vertical direction under the action of the lifting mechanism. The whole process is smooth and can effectively avoid damage to the concrete components during the transfer process. Moreover, one piece can be transferred after it is produced. The whole process is efficient. The present application can effectively avoid damage to the precast concrete components during the production process to a certain extent while also improving the hoisting and transfer efficiency.
[0008] Optionally, the support frame includes a base and a vertical plate, the base is fixedly connected to the vertical plate, the base is located between the machine base and the vertical plate, and the base can slide on the machine base.
[0009] By adopting the above technical solution, the base is used to achieve relative lateral sliding with the machine base, and the vertical plate is used to ensure that the lifting mechanism can slide in the vertical direction, that is, the horizontal and vertical transfer of the concrete component is achieved.
[0010] Optionally, the support frame further includes an inclined support plate, one end of which is fixedly connected to the base, and the other end of which is fixedly connected to the vertical plate, and the cross-section formed by the inclined support plate, the base and the vertical plate is triangular.
[0011] By adopting the above technical solution and setting the diagonal support plate, the cross section formed by the diagonal support plate and the base vertical plate is triangular, which improves the stability of the vertical plate, that is, improves the stability during the transfer process.
[0012] Optionally, a plurality of the diagonal bracing plates are provided, and the plurality of the diagonal bracing plates are arranged in parallel.
[0013] By adopting the above technical solution, the stability of the vertical board is further enhanced.
[0014] Optionally, the transverse movement mechanism includes a transverse movement motor, a transverse movement rod and a limit rod. The rotating shaft of the transverse movement motor passes through the machine base and is fixedly connected to the transverse movement rod. A through hole is opened on the base. The transverse movement rod passes through the through hole and is rotatably connected to the base. Both ends of the limit rod are fixed on the base, and the limit rod is arranged parallel to the transverse movement rod.
[0015] By adopting the above technical solution, the transverse movement mechanism is configured as a combination of a transverse movement motor, a transverse movement rod and a limit rod. When the transverse movement motor rotates, it can drive the transverse movement rod to rotate. The rotation of the transverse movement rod will drive the base rotatably connected to it to move, and under the action of the limit rod, the base can only move horizontally without flipping, which means that effective transverse movement is achieved.
[0016] Optionally, the lifting mechanism includes a lifting motor, a lifting rod, and a lifting seat. A accommodating groove is opened on the vertical plate. The lifting motor is located at the top of the vertical plate. The rotating shaft of the lifting motor passes through the side wall of the accommodating groove and is fixedly connected to the lifting rod. The lifting rod is rotatably connected to the side wall of the accommodating groove, and the lifting seat is rotatably connected to the lifting rod.
[0017] By adopting the above technical solution, the lifting mechanism of the present application is configured as a combination of a lifting motor, a lifting rod, and a lifting seat. The rotation of the lifting motor can drive the lifting seat to lift, and due to the setting of the accommodating groove, the lifting seat will not rotate, thereby achieving stable lifting.
[0018] Optionally, a lifting platform is fixedly connected to the lifting seat to support the prefabricated concrete components.
[0019] By adopting the above technical solution and setting up the lifting platform, various types of prefabricated concrete components can be effectively lifted and transferred.
[0020] Optionally, it also includes an auxiliary lifting assembly, which includes an auxiliary base, an auxiliary plate, an auxiliary rod, an auxiliary block and an auxiliary limiting rod. The auxiliary base is arranged on the ground, the auxiliary plate is arranged parallel to the vertical plate and is slidably connected to the auxiliary base, the auxiliary plate is provided with a clearance groove, the auxiliary rod is fixedly connected to the side wall of the clearance groove, the auxiliary block is slidably connected to one end of the auxiliary rod and the other end is fixedly connected to the lifting platform, both ends of the auxiliary limiting rod are fixedly connected to the auxiliary base, and the auxiliary limiting rod passes through the auxiliary plate.
[0021] By adopting the above technical solution, the auxiliary lifting assembly can further ensure the stability of the equipment in the present application during the process of transferring precast concrete components.
[0022] Optionally, a buffer plate is movably connected to the base.
[0023] By adopting the above technical solution and setting the buffer plate, the lateral movement mechanism can effectively avoid direct collision between the base and the side wall of the base during lateral movement, further enhancing the stability of the equipment during operation.
[0024] Optionally, a height sensor is also provided, and a plurality of the height sensors are provided. The plurality of height sensors are located on the bottom surface of the lifting platform, and the height sensor is electrically connected to the control panel.
[0025] By adopting the above technical solution and setting the height sensor, it is possible to effectively ensure that the precast concrete components are located at a safe height during the transfer process, and will not be too low or too high.
[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. The hoisting and transfer equipment of the present application is configured as a combination of a machine base, a bearing frame, a transverse movement mechanism, and a lifting mechanism. When the precast concrete components are to be hoisted and transferred, the bearing frame can be moved transversely under the action of the transverse movement mechanism, and the equipment can lift the concrete components in the vertical direction under the action of the lifting mechanism. The whole process is smooth and can effectively avoid the damage of the concrete components during the transfer process. Moreover, one piece can be transferred after one piece is produced. The whole process is highly efficient. The present application can effectively avoid the damage of the precast concrete components during the production process and improve the hoisting and transfer efficiency to a certain extent. 2. The transverse movement mechanism is configured as a combination of a transverse movement motor, a transverse movement rod and a limit rod. When the transverse movement motor rotates, it can drive the transverse movement rod to rotate. The rotation of the transverse movement rod will drive the base connected to it to move. Under the action of the limit rod, the base can only move horizontally without turning over, that is, effective transverse movement is achieved; 3. The setting of the buffer plate effectively prevents the base from directly colliding with the side wall of the base during the lateral movement of the lateral movement mechanism, further enhancing the stability of the equipment during operation. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 It is a schematic diagram of the overall structure of a hoisting and transferring device for producing precast concrete components according to an embodiment of the present application.
[0028] Figure 2 yes Figure 1 Schematic diagram of the structure from another perspective.
[0029] Figure 3 yes Figure 1 Magnified view of area A.
[0030] Figure 4 yes Figure 1 Magnified view of area B.
[0031] Figure 5 yes Figure 2 Magnified view of area C.
[0032] Figure 6 yes Figure 2 Magnified view of area D in the middle.
[0033] Description of reference numerals: 1. Machine base; 2. Control panel; 3. Carrying frame; 31. Base; 32. Vertical plate; 33. Diagonal support plate; 4. Transverse movement mechanism; 41. Transverse movement motor; 42. Transverse movement rod; 43. Limit rod; 5. Lifting mechanism; 51. Lifting motor; 52. Lifting rod; 53. Lifting seat; 6. Through hole; 7. Accommodating groove; 8. Lifting platform; 9. Auxiliary lifting assembly; 91. Auxiliary base; 92. Auxiliary plate; 93. Auxiliary rod; 94. Auxiliary block; 95. Auxiliary limit rod; 10. Make way groove; 11. Buffer plate; 12. Height sensor. DETAILED DESCRIPTION
[0034] The following is combined with Figure 1-6 This application is described in further detail.
[0035] The embodiment of the present application discloses a hoisting and transferring device for the production of precast concrete components.
[0036] It should be noted that, in the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0037] It should also be noted that the hoisting and transfer equipment of the present application mainly solves the problem of how to hoist and transfer various types of precast concrete components. Regarding the hoisting method in the production process, a more conventional hoisting method is used, which is easier for those skilled in the art to understand. In other words, the invention of the present application mainly focuses on how to transfer precast concrete components in the production process.
[0038] Finally, in order to further understand the present application, it is also necessary to explain that the improvement of the present application is based on the fact that in the process of producing precast concrete components, prefabricated beams, slabs, and columns need to be placed on transport vehicles, and many of them need to be stacked later. If only lifting is carried out, manual operation of the crane for transportation not only has high requirements on the operator, but also has low efficiency. However, the setting of the equipment of the present application can reduce the operating requirements for the operator and effectively improve the efficiency of lifting and transfer.
[0039] Reference Figure 1 A hoisting and transferring equipment for the production of precast concrete components includes a machine base 1, a load frame 3, a transverse movement mechanism 4, and a lifting mechanism 5. When the precast concrete components are to be hoisted and transferred, it is only necessary to hoist the precast concrete components to the load frame 3 first, and then use the lifting mechanism 5 to lift the load frame 3 to a certain height according to the needs of subsequent transportation. After the precast concrete components are placed, the transverse movement mechanism 4 is used to perform transverse transfer. When the precast concrete components are transversely transferred to the designated position, the precast concrete components can be hoisted away. The entire process can be controlled by the control panel 2 on the machine base 1, which is safe and efficient. The present application can effectively avoid component damage during the production process of precast concrete components to a certain extent while also improving the hoisting and transfer efficiency.
[0040] Specifically, the base 1 is set on the ground, and a control panel 2 is provided on the base 1, that is, the control panel 2 is used to control the entire device. As for how the control panel 2 controls the entire device, it is relatively easy to implement for technical personnel in this field, for example, by using Bluetooth connection.
[0041] Specifically, refer to Figure 2 and Figure 3 The support frame 3 is slidably connected to the base 1 , and the support frame 3 includes a base 31 and a vertical plate 32 , the base 31 is fixedly connected to the vertical plate 32 , the base 31 is located between the base 1 and the vertical plate 32 , and the base 31 can slide on the base 1 .
[0042] The base 31 is used to achieve relative lateral sliding with the machine base 1, and the vertical plate 32 is used to ensure that the lifting mechanism 5 can slide in the vertical direction, that is, to achieve the horizontal and vertical transfer of the concrete component.
[0043] Furthermore, the support frame 3 also includes an inclined support plate 33, one end of the inclined support plate 33 is fixedly connected to the base 31, and the other end is fixedly connected to the vertical plate 32. The cross section formed by the inclined support plate 33, the base 31, and the vertical plate 32 is triangular.
[0044] The arrangement of the diagonal support plate 33 makes the cross section formed by the diagonal support plate 33, the base 31 and the vertical plate 32 to be triangular, thereby improving the stability of the vertical plate 32, that is, improving the stability during the transfer process.
[0045] Furthermore, a plurality of diagonal bracing plates 33 are provided, and the plurality of diagonal bracing plates 33 are arranged in parallel. In the embodiment of the present application, three diagonal bracing plates 33 are provided. In other embodiments, the diagonal bracing plates 33 may also be provided in two, four or other numbers, which are all preferred embodiments of the present application. The plurality of diagonal bracing plates 33 is provided, which effectively improves the stability of the carrier 3.
[0046] At the same time, the base 31 is also movably connected to a buffer plate 11. As for the connection method of the buffer plate 11, it can be understood that a groove is provided on the base 31, an elastic member is connected to the bottom wall of the groove, and the other end of the elastic member is connected to the buffer plate 11. This is relatively easy to understand for those skilled in the art, so it is not specifically shown in the drawings of the present application specification.
[0047] The setting of the buffer plate 11 effectively prevents the base 31 from directly colliding with the side wall of the machine base 1 during the lateral movement of the transverse movement mechanism 4, or even if a collision occurs, it is the buffer plate 11 that collides with the machine base 1, which can effectively prevent the possibility of the support frame 3 overturning during the lateral movement, and further enhance the stability and service life of the equipment during operation.
[0048] For details, refer to 3 and Figure 4 The transverse mechanism 4 is arranged on the machine base 1. The transverse mechanism 4 can make the hoisting assembly move horizontally. The transverse mechanism 4 is electrically connected to the control panel 2. The transverse mechanism 4 includes a transverse motor 41, a transverse rod 42 and a limit rod 43. The rotation axis of the transverse motor 41 passes through the machine base 1 and is fixedly connected to the transverse rod 42. A through hole 6 is provided on the base 31. The transverse rod 42 passes through the through hole 6 and is rotatably connected to the base 31. Both ends of the limit rod 43 are fixed on the base 31, and the limit rod 43 is arranged parallel to the transverse rod 42. In the present application, two limit rods 43 are arranged, which are respectively located on both sides of the transverse rod 42.
[0049] The transverse movement mechanism 4 is configured as a combination of a transverse movement motor 41, a transverse movement rod 42 and a limit rod 43. When the transverse movement motor 41 rotates, it can drive the transverse movement rod 42 to rotate. The rotation of the transverse movement rod 42 will drive the base 31 rotatably connected thereto to move, and under the action of the limit rod 43, the base 31 can only move horizontally without flipping, that is, effective transverse movement is achieved.
[0050] Specifically, refer to Figure 4 and Figure 5 The lifting mechanism 5 is arranged on the carrier 3, and the lifting mechanism 5 can be lifted vertically on the carrier 3, and the lifting mechanism 5 is electrically connected to the control panel 2. The lifting mechanism 5 includes a lifting motor 51, a lifting rod 52, and a lifting seat 53. The vertical plate 32 is provided with a receiving groove 7, and the lifting motor 51 is located at the top of the vertical plate 32. The rotating shaft of the lifting motor 51 passes through the side wall of the receiving groove 7 and is fixedly connected to the lifting rod 52. The lifting rod 52 is rotatably connected to the side wall of the receiving groove 7, and the lifting seat 53 is rotatably connected to the lifting rod 52.
[0051] The lifting mechanism 5 of the present application is configured as a combination of a lifting motor 51, a lifting rod 52, and a lifting seat 53. The rotation of the lifting motor 51 can drive the lifting seat 53 to lift, and due to the setting of the accommodating groove 7, the lifting seat 53 will not rotate, thereby achieving stable lifting.
[0052] Furthermore, a height sensor 12 is provided. A plurality of height sensors 12 are provided. The plurality of height sensors 12 are located on the bottom surface of the lifting platform 8 . The height sensors 12 are electrically connected to the control panel 2 .
[0053] The arrangement of the height sensor 12 can effectively ensure that the precast concrete components are located at a safe height during the transfer process, and will not be too low or too high.
[0054] At the same time, a lifting platform 8 is fixedly connected to the lifting seat 53 to support the precast concrete components. It should be noted here that the lifting platform 8 is mainly used to support different precast concrete components. If the lifting platform 8 is not provided, a platform adapted to the corresponding precast concrete components needs to be provided for lifting, but the scope of application is not as wide as the lifting platform 8 of this application.
[0055] The provision of the lifting platform 8 can effectively lift and transfer various types of prefabricated concrete components.
[0056] At the same time, refer to Figure 2 , Figure 5 and Figure 6 It also includes an auxiliary lifting component 9, which includes an auxiliary base 91, an auxiliary plate 92, an auxiliary rod 93, an auxiliary block 94 and an auxiliary limiting rod 95. The auxiliary base 91 is set on the ground, the auxiliary plate 92 is set parallel to the vertical plate 32, and is slidably connected to the auxiliary base 91. A clearance groove 10 is opened on the auxiliary plate 92, the auxiliary rod 93 is fixedly connected to the side wall of the clearance groove 10, the auxiliary block 94 is slidably connected to the auxiliary rod 93 at one end, and the other end is fixedly connected to the lifting platform 8, both ends of the auxiliary limiting rod 95 are fixedly connected to the auxiliary base 91, and the auxiliary limiting rod 95 passes through the auxiliary plate 92.
[0057] The above-mentioned setting of the auxiliary lifting component 9 can further enable the auxiliary lifting component 9 to lift the lifting platform 8 together with the lifting component, thereby enhancing the stability during the lifting process. The auxiliary lifting component 9 can further ensure the stability of the equipment in the present application during the process of transferring precast concrete components.
[0058] The implementation principle of a hoisting and transferring device for the production of precast concrete components in an embodiment of the present application is as follows: the hoisting and transferring device of the present application is arranged as a combination of a machine base 1, a bearing frame 3, a transverse movement mechanism 4, and a lifting mechanism 5. When the precast concrete components are to be hoisted and transferred, the bearing frame 3 can be moved laterally under the action of the transverse movement mechanism 4, and the equipment can lift the concrete components in the vertical direction under the action of the lifting mechanism 5. The whole process is smooth and can effectively avoid damage to the concrete components during the transfer process, and one piece can be transferred after it is produced. The whole process is efficient. The present application can effectively avoid damage to the precast concrete components during the production process to a certain extent while also improving the hoisting and transfer efficiency.
[0059] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. A hoisting and transferring device for the production of precast concrete components, characterized in that: include: A machine base (1) is arranged on the ground, and a control panel (2) is arranged on the machine base (1); A carrier frame (3) slidably connected to the machine base (1); A transverse movement mechanism (4) is arranged on the machine base (1), the transverse movement mechanism (4) is capable of causing the hanging assembly to move transversely, and the transverse movement mechanism (4) is electrically connected to the control panel (2); and A lifting mechanism (5) is arranged on the supporting frame (3); the lifting mechanism (5) can be lifted vertically on the supporting frame (3); and the lifting mechanism (5) is electrically connected to the control panel (2).
2. The hoisting and transferring equipment for the production of precast concrete components according to claim 1, characterized in that: The support frame (3) comprises a base (31) and a vertical plate (32), wherein the base (31) is fixedly connected to the vertical plate (32), the base (31) is located between the machine base (1) and the vertical plate (32), and the base (31) is capable of sliding on the machine base (1).
3. The hoisting and transferring equipment for the production of precast concrete components according to claim 2, characterized in that: The support frame (3) further comprises an inclined support plate (33), one end of the inclined support plate (33) being fixedly connected to the base (31), and the other end of the inclined support plate (33) being fixedly connected to the vertical plate (32), and the cross section formed by the inclined support plate (33), the base (31) and the vertical plate (32) is triangular.
4. The hoisting and transferring equipment for the production of precast concrete components according to claim 3, characterized in that: A plurality of the diagonal support plates (33) are provided, and the plurality of diagonal support plates (33) are arranged in parallel.
5. The hoisting and transferring equipment for the production of precast concrete components according to claim 2, characterized in that: The transverse movement mechanism (4) comprises a transverse movement motor (41), a transverse movement rod (42) and a limit rod (43); the rotation axis of the transverse movement motor (41) passes through the machine base (1) and is fixedly connected to the transverse movement rod (42); a through hole (6) is provided on the base (31); the transverse movement rod (42) passes through the through hole (6) and is rotatably connected to the base (31); both ends of the limit rod (43) are fixed to the base (31), and the limit rod (43) is arranged in parallel with the transverse movement rod (42).
6. The hoisting and transferring equipment for the production of precast concrete components according to claim 2, characterized in that: The lifting mechanism (5) comprises a lifting motor (51), a lifting rod (52), and a lifting seat (53); a receiving groove (7) is provided on the vertical plate (32); the lifting motor (51) is located at the top of the vertical plate (32); the rotating shaft of the lifting motor (51) passes through the side wall of the receiving groove (7) and is fixedly connected to the lifting rod (52); the lifting rod (52) is rotatably connected to the side wall of the receiving groove (7); and the lifting seat (53) is rotatably connected to the lifting rod (52).
7. The hoisting and transferring equipment for precast concrete component production according to claim 6, characterized in that: The lifting seat (53) is fixedly connected to a lifting platform (8) to support the prefabricated concrete components.
8. The hoisting and transferring equipment for the production of precast concrete components according to claim 7, characterized in that: The auxiliary lifting assembly (9) further comprises an auxiliary lifting assembly (9), the auxiliary lifting assembly (9) comprising an auxiliary base (91), an auxiliary plate (92), an auxiliary rod (93), an auxiliary block (94) and an auxiliary limiting rod (95); the auxiliary base (91) is arranged on the ground; the auxiliary plate (92) is arranged parallel to the vertical plate (32) and is slidably connected to the auxiliary base (91); a clearance groove (10) is provided on the auxiliary plate (92); the auxiliary rod (93) is fixedly connected to the side wall of the clearance groove (10); the auxiliary block (94) is slidably connected to the auxiliary rod (93) at one end and fixedly connected to the lifting platform (8) at the other end; both ends of the auxiliary limiting rod (95) are fixedly connected to the auxiliary base (91); and the auxiliary limiting rod (95) passes through the auxiliary plate (92).
9. The hoisting and transferring equipment for the production of precast concrete components according to claim 2, characterized in that: The base (31) is also movably connected to a buffer plate (11).
10. The hoisting and transferring equipment for the production of precast concrete components according to claim 7, characterized in that: A height sensor (12) is also provided. A plurality of the height sensors (12) are provided. The plurality of height sensors (12) are located on the bottom surface of the lifting platform (8). The height sensors (12) are electrically connected to the control panel (2).