Underwater power supply cabin
By designing a multi-chamber structure underwater power cabin, the generalization problem caused by the differences in the design of existing power cabins is solved, high versatility, excellent performance and stability are achieved, and the research and development and application efficiency of marine observation detection equipment is improved.
Patent Information
- Application Number
- CN202421749510.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-23
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-07-23
AI Technical Summary
There are differences in the power compartment design of existing marine observation detection equipment, which is difficult to achieve generalization, resulting in increased R&D and production complexity, increased costs, and difficult to achieve optimal performance and stability.
A high versatile, superior performance and stable underwater power cabin is designed, and a chamber structure separated by a pressure-resistant shell and multiple horizontal pallets is adopted, including a power cavity, a power control cavity, a power conversion cavity, a status monitoring cavity and a connector connection cavity, which realizes the access, cutting and charging of the battery assembly, voltage and current conversion, and real-time status monitoring.
It improves the versatility and ease of use of the power cabin, avoids repeated design and manufacturing costs, achieves excellent performance and stability, can flexibly adjust functions according to needs, and performs status monitoring and feedback during operation, improving the efficiency of equipment usage and the reliability of the research and development and application of marine observation detection equipment.
Smart Images

Figure CN222927569U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of marine observation and detection equipment, in particular to an underwater power supply cabin. Background Art
[0002] During the R & D process of marine observation and detection equipment, the power supply cabin is a key component, playing a core role in providing power support for the entire system. However, there are a variety of power supply cabins on the market currently, lacking unified technical specifications. There are significant differences in the design and manufacturing of power supply cabins of different models, making it difficult to achieve generalization. This not only increases the complexity of R & D and production but also raises the cost. Each time a new marine observation and detection equipment is developed, it is often necessary to redesign and manufacture the power supply cabin, resulting in an increase in the cost of repeated design and manufacturing.
[0003] As the core component of marine observation and detection equipment, the performance and stability of the power supply cabin directly affect the reliability and working efficiency of the entire device. Currently, many power supply cabins are difficult to reach the optimal state in terms of performance and stability, affecting the overall performance of marine observation and detection equipment. Summary of the Utility Model
[0004] Aiming at the deficiencies existing in the above-mentioned prior art, the utility model provides an underwater power supply cabin with high generality, excellent performance and stability.
[0005] The utility model provides an underwater power supply cabin, including a pressure-resistant housing. A watertight connector is arranged at the top of the pressure-resistant housing. The pressure-resistant housing forms a receiving cavity. It is characterized in that a plurality of horizontal support plates are arranged in the receiving cavity, and the support plates divide the receiving cavity into a plurality of chambers from bottom to top, including:
[0006] A power supply chamber, located at the bottom of the receiving cavity, is provided with a battery assembly;
[0007] A power supply control chamber, located above the power supply chamber, is provided with a battery control circuit board. The battery control circuit board is electrically connected to the battery assembly and is used to realize the access, disconnection and charging functions of the battery assembly:
[0008] A power conversion chamber, located above the power supply control chamber, is provided with a power conversion circuit board. The power conversion circuit board is connected to the battery control circuit board and is used to convert the voltage and current of the battery assembly into the voltage and current required externally;
[0009] A status monitoring chamber, located above the power conversion chamber, is provided with a power supply cabin status monitoring circuit board. The power supply cabin status monitoring circuit board is connected to the battery assembly, the battery control circuit board and the power conversion circuit board and is used to monitor the working status of the battery assembly, the power conversion circuit board and the battery control circuit board;
[0010] The connector connection cavity is located above the status monitoring cavity and is provided with an external connector connection circuit board. The external connector connection circuit board is connected to the power conversion circuit board and the power cabin status monitoring circuit board, and the external connector connection circuit board is connected to external devices through the watertight connector.
[0011] In this technical solution, the power cabin has a reasonable layout, improving the versatility and usability of the power cabin. It has excellent performance and stability, can flexibly adjust its functions according to requirements, and can monitor and feedback the status inside the power cabin during operation, facilitating maintenance and adjustment during use, improving the usage efficiency of the equipment, and at the same time improving the R & D efficiency of ocean observation and detection equipment and the reliability in practical applications.
[0012] In some embodiments of the present application, the external connector connection circuit board is connected to the host computer through the watertight connector, and the host computer can modify the functions of the power cabin online.
[0013] In some embodiments of the present application, the power conversion circuit board further includes an anti-reverse connection protection circuit, an overcurrent protection circuit, a short-circuit protection circuit, and a delay start circuit, enabling the power cabin to have functions of anti-reverse connection protection, overcurrent protection, short-circuit protection, and delay start. The working status of the power conversion circuit board is real-time fed back to the power cabin status monitoring circuit board.
[0014] In some embodiments of the present application, the external connector connection circuit board is also electrically connected to the battery control circuit board, and the external power supply charges the battery assembly through the watertight connector, the external connector connection circuit board, and the battery control circuit board.
[0015] In some embodiments of the present application, the pressure-resistant housing includes a cylindrical pressure-resistant shell, a top cover provided on the top of the pressure-resistant shell, and a bottom cover provided on the bottom of the pressure-resistant shell. The watertight connector is provided on the top cover.
[0016] In some embodiments of the present application, a water leakage detection module is provided on the bottom cover of the pressure-resistant housing for detecting the water leakage information inside the power cabin. The water leakage detection module is electrically connected to the power cabin status monitoring circuit board.
[0017] In some embodiments of the present application, the battery assembly includes a first battery group and a second battery group. The battery assembly further includes an energy management system that transmits the voltage, current, temperature, capacity, and health status of the first battery group and the second battery group to the power cabin status monitoring circuit board in real time.
[0018] In some embodiments of the present application, the power supply chamber includes a first power supply chamber and a second power supply chamber arranged vertically. The first power supply chamber includes:
[0019] A lower pressing plate located below, an upper pressing plate located above the lower pressing plate, and support rods located between the edges of the upper pressing plate and the lower pressing plate for connecting the upper pressing plate and the lower pressing plate. The first battery pack is placed on the lower pressing plate:
[0020] The second power supply chamber has the same structure as the first power supply chamber, and the second battery pack is located on the lower pressing plate of the second power supply chamber.
[0021] In some embodiments of the present application, insulating buffer pads are provided above and below both the first battery pack and the second battery pack.
[0022] In some embodiments of the present application, a support rod for the pallet is connected between each pallet. The support rod for the pallet is used to support each pallet, and the battery control circuit board, the power conversion circuit board, the power supply chamber status monitoring circuit board, and the external connector connection circuit board are all arranged on each pallet.
[0023] Based on the above technical solutions, the layout of the power supply chamber is reasonable, which improves the versatility and usability of the power supply chamber, can avoid the cost of repeated design and production, and has excellent performance and stability;
[0024] It can flexibly adjust its functions according to requirements, and can monitor and feedback the status inside the power supply chamber during operation, which is convenient for maintenance and adjustment during use and improves the use efficiency of the equipment;
[0025] According to application requirements, the functions of the power supply chamber can be modified online through the host computer, and at the same time, the R & D efficiency of the ocean observation and detection equipment and the reliability in actual application are improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:
[0027] Figure 1 is a schematic external structure diagram of the power supply chamber according to an embodiment of the present invention;
[0028] Figure 2 is a schematic diagram of the internal chamber distribution of the power supply chamber according to an embodiment of the present invention;
[0029] Figure 3 is a schematic internal structure diagram of the power supply chamber according to an embodiment of the present invention;
[0030] Figure 4 Schematic diagram of the structure of the power supply cavity according to an embodiment of the present utility model;
[0031] Figure 5 Schematic diagram of the positional relationship between the support plate and the support rod of the support plate according to an embodiment of the present utility model;
[0032] Figure 6 Functional block diagram of the power supply compartment according to an embodiment of the present utility model.
[0033] In the figure:
[0034] 10, pressure-resistant housing; 11, accommodation cavity; 111, power supply cavity; 1111, first power supply cavity; 1112, second power supply cavity; 112, power supply control cavity; 113, power conversion cavity; 114, status monitoring cavity; 115, connector connection cavity; 12, support plate; 121, support rod of the support plate; 13, battery control circuit board; 14, power conversion circuit board; 15, power supply compartment status monitoring circuit board; 16, external connector connection circuit board; 17, pressure-resistant shell; 18, top cover; 19, bottom cover; 20, watertight connector; 30, battery assembly; 31, first battery pack; 32, second battery pack; 40, water leakage detection module; 50, lower pressure plate; 60, upper pressure plate; 70, support rod; 80, gap connecting rod. Detailed implementation manners
[0035] Next, the technical solutions in the embodiments will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.
[0036] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model 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 should not be construed as a limitation of the present utility model.
[0037] The terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first", "second", and "third" may explicitly or implicitly include one or more of such features.
[0038] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "linkage" 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 direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.
[0039] This embodiment provides an underwater power supply cabin, as shown in the attached Figure 1 figure. It includes a pressure-resistant housing 10. A watertight connector 20 is provided at the top of the pressure-resistant housing 10. The pressure-resistant housing 10 forms a receiving cavity 11. A plurality of horizontal support plates 12 are arranged in the receiving cavity 11. The support plates divide the receiving cavity 11 into multiple chambers from bottom to top. As Figures 2-3 shown in the figure, in this embodiment, there are four horizontally arranged support plates 12, and the support plates 12 divide the receiving cavity 11 into five chambers from bottom to top, which are respectively:
[0040] A power supply chamber 111, located at the bottom of the receiving cavity 11, is provided with a battery assembly 30;
[0041] A power supply control chamber 112, located above the power supply chamber 111, is provided with a battery control circuit board 13. The battery control circuit board 13 is placed on the support plate 12 of the power supply control chamber 112. The battery control circuit board 13 is electrically connected to the battery assembly 30 and is used to realize the access, cut-off, and charging functions of the battery assembly 30:
[0042] A power conversion chamber 113, located above the power supply control chamber 112, is provided with a power conversion circuit board 14, which is placed on the support plate 12 of the power conversion chamber 113. The power conversion circuit board 14 is connected to the battery control circuit board 13 and is used to convert the voltage and current of the battery assembly 30 into the voltage and current required externally;
[0043] A status monitoring chamber 114, located above the power conversion chamber 113, is provided with a power supply cabin status monitoring circuit board 15, which is placed on the support plate 12 of the status monitoring chamber 114. The power supply cabin status monitoring circuit board 15 is communicatively connected to the battery assembly 30 through an RS485 bus, and is communicatively connected to the battery control circuit board 13 and the power conversion circuit board 14 through an RS232. The power supply cabin status monitoring circuit board 15 is used to monitor the working status of the battery assembly 30, the power conversion circuit board 14, and the battery control circuit board 13;
[0044] The connector connection cavity 115, located above the status monitoring cavity 114, is provided with an external connector connection circuit board 16 placed on the pallet 12 in the connector connection cavity 115. The external connector connection circuit board 16 is electrically connected to the power conversion circuit board 14 and communicates with the power supply compartment status monitoring circuit board 15 through the RS485 bus. Moreover, the external connector connection circuit board 16 is connected to the watertight connector 20 through a power line or a communication line, and the external connector connection circuit board 16 is connected to external devices through the watertight connector 20.
[0045] In this embodiment, the external connector connection circuit board 16 is connected to the host computer through the watertight connector 20. The host computer is configured to modify the functions of the power supply compartment online, control the opening and closing of the external output, and can be flexibly configured according to actual applications.
[0046] Furthermore, the battery assembly 30 of this embodiment includes a first battery pack 31 and a second battery pack 32. Among them, the first battery pack 31 is a 24V battery pack, and the second battery pack 32 is a 48V battery pack. Both the first battery pack 31 and the second battery pack 32 include an energy management system, which transmits the voltage, current, temperature, capacity, and health status of the first battery pack 31 and the second battery pack 32 to the power supply compartment status monitoring circuit board 15 in real time.
[0047] The power conversion circuit board 14 also includes an anti-reverse connection protection circuit, an overcurrent protection circuit, a short-circuit protection circuit, and a delay start circuit, enabling the power supply compartment to have functions of anti-reverse connection protection, overcurrent protection, short-circuit protection, and delay start. The working status of the power conversion circuit board 14 is real-time fed back to the power supply compartment status monitoring circuit board 15 through RS232.
[0048] The first battery pack 31 and the second battery pack 32 of this embodiment are rechargeable battery packs. The external connector connection circuit board 16 is electrically connected to the battery control circuit board 13, and the external power supply charges the battery assembly through the watertight connector 20, the external connector connection circuit board 16, and the battery control circuit board.
[0049] As Figure 6 shown, for the underwater power supply compartment of this embodiment, the 24V battery pack of the first battery pack 31 and the 48V battery pack of the second battery pack 32 are controlled to turn on by the battery control circuit board 13. After being converted by the power conversion circuit board 14, different power supplies of 12V, 24V, and 48V can be output externally. The power conversion circuit board 14 converts the battery pack voltage into the voltage required externally, and at the same time adds functions such as anti-reverse connection protection, overcurrent protection, short-circuit protection, and delay start. Its working status is real-time fed back to the 15 power supply compartment status monitoring circuit board.
[0050] The internal state of the power supply compartment includes the state of the battery pack and the working state of the power conversion circuit board 14, which is output through the RS485 bus. At the same time, the opening and closing of the external output can be configured through the host computer software, and it can be flexibly configured according to actual applications. The first battery pack 31 and the second battery pack 32 have built-in BMS functions, that is, they include an energy management system, and the internal states of the first battery pack 31 and the second battery pack 32, including voltage, current, temperature, capacity, and health status, etc., are sent to the power supply compartment status monitoring circuit board 15 in real time;
[0051] The access, disconnection, and charging functions of the first battery pack 31 and the second battery pack 32 are realized through the battery control circuit board 13, and the working conditions are fed back to the power supply compartment status monitoring circuit board 15 at the same time; the externally output power supply and signal lines are all connected to the external connector connection circuit board 16, and then the harnesses of the watertight connector 20 are classified and correspondingly connected to the external connector connection circuit board 16.
[0052] In this embodiment, the layout and setting of the physical structure of the power supply compartment are stable and reliable. The pressure-resistant housing 10 includes a cylindrical pressure-resistant shell 17, a top cover 18 provided at the top of the pressure-resistant shell 17 for sealing the upper part of the pressure-resistant shell 17, and a bottom cover 19 provided at the bottom of the pressure-resistant shell 17 for sealing the bottom of the pressure-resistant shell 17. A watertight connector 20 is provided on the top cover 18; at the same time, a water leakage detection module 40 is provided on the bottom cover 19 of the pressure-resistant housing for detecting the water leakage information inside the power supply compartment. The water leakage detection module 40 is connected to the power supply compartment status monitoring circuit board 15, and the water leakage information is fed back to the power supply compartment status monitoring circuit board 15 in real time to obtain the water leakage information and improve the use safety of the power supply compartment.
[0053] As Figure 2 shown, the power supply cavity 111 includes a first power supply cavity 1111 and a second power supply cavity 1112 arranged up and down, where the first power supply cavity 1111 includes:
[0054] As Figure 4As shown in the figure, there is a lower pressing plate 50 located below, an upper pressing plate 60 located above the lower pressing plate 50. The upper pressing plate 60 is parallel to the lower pressing plate 50. The support rods 70 are located at the edge positions of the upper pressing plate 60 and the lower pressing plate 50. A number of mounting holes are evenly arranged at the edges of the lower pressing plate 50 and the upper pressing plate 60. Both ends of the support rods 70 pass through the mounting holes of the upper pressing plate 60 and the lower pressing plate 50 and are tightened to fix the upper pressing plate 60 and the lower pressing plate 50. The first battery pack 31 is placed on the lower pressing plate 50; the second power supply cavity 1112 and the first power supply cavity 1111 have the same structure, and also include a lower pressing plate 50, an upper pressing plate 60 and support rods 70. The second battery pack 32 is located on the lower pressing plate 50 of the second power supply cavity 1112; in this embodiment, a gap connecting rod 80 is arranged between the upper pressing plate 60 of the first power supply cavity 1111 and the lower pressing plate 50 of the second power supply cavity. The gap connecting rod 80 aligns and fixes the first battery pack 31 and the second battery pack 32 coaxially.
[0055] In order to prevent the battery packs from colliding during the underwater movement, insulating buffer pads (not shown in the figure) are arranged above and below the first battery pack 31 and the second battery pack 32.
[0056] Similarly, as Figure 5 shown, a pallet support rod 121 is connected between the respective pallets 12 for supporting the respective pallets 12. The battery control circuit board 13, the power conversion circuit board 14, the power supply chamber status monitoring circuit board 15, and the external connector connection circuit board 16 are all arranged on the respective pallets 12. Then, through the pallet support rod 121, the above-mentioned respective pallets 12 are horizontally stacked together. In this embodiment, a gap connecting rod 80 is also arranged between the pallet 12 on which the battery control circuit board 13 is placed and the upper pressing plate 60 of the second power supply cavity 1112 to align the power supply cavity 1111 and the upper power control cavity 112, power conversion cavity 113, status monitoring cavity 114, and connector connection cavity 115 coaxially.
[0057] During assembly, first assemble the first battery pack 31 and the second battery pack 32. Wrap the first battery pack 31 and the second battery pack 32 with insulating buffer pads respectively up and down. Tighten and fix the upper pressing plate 60, the support rods 70 and the lower pressing plate 50. Through the gap connecting rod 80, align and fix the two battery packs coaxially up and down; then fix the water leakage detection module 40 on the bottom cover 19. Finally, install the fixed first battery pack 31 and the second battery pack 32 on the bottom cover 19 and fix them in alignment with screws; then assemble and fix the circuit boards. First, fix the battery control circuit board 13 on the pallet 12 in sequence, fix the power conversion circuit board 14 on the pallet 12, fix the power supply chamber status monitoring circuit board 15 on the pallet 12, fix the external connector connection circuit board 16 on the pallet 12. Then, the pallet support rod 121 passes through the edges of the above four pallets 12 for horizontal stacking, and then is fixed on the upper pressing plate 60 of the second battery pack 32 through the gap connecting rod 80.
[0058] The power supply cabin layout of this embodiment is reasonable, improving the versatility and usability of the power supply cabin, capable of avoiding repeated design, optimizing the manufacturing cost, and having excellent performance and stability;
[0059] It can flexibly adjust its functions according to requirements, and can monitor and feedback the internal state of the power supply cabin during operation, facilitating maintenance and adjustment during use and improving the equipment utilization efficiency;
[0060] According to application requirements, the functions of the power supply cabin can be modified online through the host computer, while improving the R & D efficiency of ocean observation and detection equipment and the reliability in practical applications.
[0061] Finally, it should be noted that: the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other.
[0062] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: still modifications can be made to the specific implementation manners of the present invention or equivalent replacements can be made to some technical features; without departing from the spirit of the technical solutions of the present invention, they should all be covered within the scope of the technical solutions claimed by the present invention.
Claims
1. An underwater power supply cabin, comprising a pressure-resistant shell, a watertight connector is arranged on the top of the pressure-resistant shell, and a receiving cavity is formed in the pressure-resistant shell, characterized in that: The accommodating cavity is provided with a plurality of horizontal support plates, and the support plates divide the accommodating cavity from bottom to top into a plurality of chambers, including: A power cavity, located at the bottom of the accommodating cavity, is provided with a battery assembly; The power control cavity is located above the power cavity and is provided with a battery control circuit board, which is electrically connected to the battery assembly and is used to realize the connection, disconnection and charging functions of the battery assembly: A power conversion chamber, located above the power control chamber, is provided with a power conversion circuit board, the power conversion circuit board is connected to the battery control circuit board, and is used to convert the voltage and current of the battery assembly into the voltage and current required by the outside; A status monitoring chamber is located above the power conversion chamber and is provided with a power compartment status monitoring circuit board. The power compartment status monitoring circuit board is connected to the battery assembly, the battery control circuit board, and the power conversion circuit board, and is used to monitor the working status of the battery assembly, the power conversion circuit board, and the battery control circuit board; The connector connection cavity is located above the status monitoring cavity and is provided with an external connector connection circuit board. The external connector connection circuit board is connected to the power conversion circuit board and the power compartment status monitoring circuit board, and the external connector connection circuit board is connected to the external device through the watertight connector.
2. The underwater power supply cabin according to claim 1, characterized in that: The external connector connection circuit board is connected to the host computer through the watertight connector, and the host computer can modify the function of the power supply compartment online.
3. The underwater power supply cabin according to claim 2, characterized in that: The power conversion circuit board also includes an anti-reverse connection protection circuit, an overcurrent protection circuit, a short circuit protection circuit and a delayed start circuit, so that the power compartment has reverse connection protection, overcurrent protection, short circuit protection and delayed start functions, and the working status of the power conversion circuit board is fed back to the power compartment status monitoring circuit board in real time.
4. The underwater power supply cabin according to claim 1, characterized in that: The external connector connection circuit board is also electrically connected to the battery control circuit board, and an external power source charges the battery assembly through the watertight connector, the external connector connection circuit board, and the battery control circuit board.
5. The underwater power supply cabin according to claim 1, characterized in that: The pressure-resistant shell comprises a cylindrical pressure-resistant shell, a top cover arranged on the top of the pressure-resistant shell, and a bottom cover arranged on the bottom of the pressure-resistant shell, and the watertight connector is arranged on the top cover.
6. The underwater power supply cabin according to claim 5, characterized in that: A water leakage detection module is provided on the bottom cover of the pressure-resistant shell, which is used to detect water leakage information inside the power supply compartment. The water leakage detection module is electrically connected to the power supply compartment status monitoring circuit board.
7. The underwater power supply cabin according to claim 1, characterized in that: The battery assembly includes a first battery group and a second battery group. The battery assembly also includes an energy management system that transmits the voltage, current, temperature, capacity and health status of the first battery group and the second battery group to the power compartment status monitoring circuit board in real time.
8. The underwater power supply cabin according to claim 7, characterized in that: The power cavity comprises a first power cavity and a second power cavity arranged vertically, and the first power cavity comprises: A lower pressing plate located below, an upper pressing plate located above the lower pressing plate, a support rod located between the edges of the upper pressing plate and the lower pressing plate, used to connect the upper pressing plate and the lower pressing plate, and the first battery pack is placed on the lower pressing plate: The second power cavity has the same structure as the first power cavity, and the second battery pack is located on the lower pressure plate of the second power cavity.
9. The underwater power supply cabin according to claim 7, characterized in that: Insulating buffer pads are arranged above and below the first battery pack and the second battery pack.
10. The underwater power supply cabin according to claim 7, characterized in that: A pallet support rod is connected between each of the pallets, and the pallet support rod is used to support each of the pallets. The battery control circuit board, the power conversion circuit board, the power compartment status monitoring circuit board, and the external connector connection circuit board are all arranged on each of the pallets.