Automatic ardealite concrete sound barrier mold
By designing an automated phosphogypsum concrete sound barrier mold, and using a drive component to switch the side plates between the pouring and demolding states, the problem of the existing molds being difficult to demold quickly was solved, and the rapid molding and demolding of phosphogypsum concrete strips was realized.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DAWU HAIJU ENVIRONMENTAL TECH CO LTD
- Filing Date
- 2025-06-13
- Publication Date
- 2026-05-22
AI Technical Summary
Existing molds are difficult to demold quickly and are not suitable for the production of phosphogypsum concrete strips.
An automated phosphogypsum concrete sound barrier mold was designed, including a base frame, a base plate, and movable side plates. The side plates are driven by a drive assembly to switch between a pouring state and a demolding state. The side plates and the base plate enclose each other to form a pouring groove and then quickly separate after molding.
It enables rapid molding and demolding of phosphogypsum concrete strips, and is suitable for phosphogypsum concrete with a fast setting speed, solving the problem of difficult demolding of existing molds.
Smart Images

Figure CN224266079U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of sound barrier board molding technology, and in particular to an automated phosphogypsum concrete sound barrier mold. Background Technology
[0002] In related technologies, cement casting is commonly used to produce the panels required for sound barriers. Existing technologies also include processes using phosphogypsum concrete to produce these panels, which has a shorter setting time compared to cement. However, because existing molds are primarily designed for cement, they are unsuitable for the production of phosphogypsum concrete panels due to their difficulty in achieving rapid demolding. Utility Model Content
[0003] This invention provides an automated mold for phosphogypsum concrete sound barriers, which solves the problem that existing molds are difficult to demold quickly and are not suitable for the production of phosphogypsum concrete strips.
[0004] This utility model provides an automated phosphogypsum concrete sound barrier mold, comprising:
[0005] Base frame;
[0006] A base plate is installed on the first side of the base frame;
[0007] Multiple side plates are movably mounted on the first side of the base frame;
[0008] The drive assembly is connected to the multiple side plates respectively to drive each side plate to move relative to the base plate, so as to switch the automated phosphogypsum concrete sound barrier mold between the pouring state and the demolding state.
[0009] When the automated phosphogypsum concrete sound barrier mold is in the pouring state, multiple side plates are connected end to end and together with the base plate to form a pouring groove; when the automated phosphogypsum concrete sound barrier mold is in the demolding state, each side plate separates from each other and moves away from the base plate.
[0010] According to the automated phosphogypsum concrete sound barrier mold of this utility model, the side plate includes:
[0011] Two first side plates are arranged opposite each other at intervals along the length of the base plate;
[0012] Two second side plates are arranged opposite each other at intervals along the width direction of the base plate;
[0013] The drive assembly is used to drive the two first side plates to move closer or further apart from each other, and to drive the two second side plates to move closer or further apart from each other.
[0014] According to the present invention, an automated phosphogypsum concrete sound barrier mold has a protrusion on one side of the second side plate facing the pouring groove, and a groove on the other side of the second side plate facing the pouring groove.
[0015] According to the automated phosphogypsum concrete sound barrier mold of this utility model, the driving component includes:
[0016] Multiple driving components are provided, and each side plate is connected to at least one driving component in a corresponding transmission manner. The driving component is used to drive the corresponding side plate to slide relative to the base plate.
[0017] According to the automated phosphogypsum concrete sound barrier mold of this utility model, each of the side plates is connected to a plurality of driving components, and the plurality of driving components are arranged at intervals along the length direction of the corresponding side plate.
[0018] According to the automated phosphogypsum concrete sound barrier mold of this utility model, the driving component further includes:
[0019] Multiple guide seats, each of the side plates is disposed corresponding to at least one of the guide seats, and the side plates are slidably disposed on the guide seats.
[0020] According to the automated phosphogypsum concrete sound barrier mold of this utility model, each side plate is correspondingly provided with multiple guide seats, and the multiple guide seats are arranged at intervals along the length direction of the corresponding side plate.
[0021] According to the automated phosphogypsum concrete sound barrier mold of this utility model, the guide seat is provided with a guide hole, and the side plate is provided with a guide rod, which is slidably inserted into the corresponding guide hole.
[0022] According to the present invention, the automated phosphogypsum concrete sound barrier mold has multiple base plates, each base plate having a corrugated surface on the side opposite to the base frame. The corrugated surfaces of the multiple base plates have different specifications, and the base frame and one of the multiple base plates are detachably connected.
[0023] The automated phosphogypsum concrete sound barrier mold according to this utility model also includes:
[0024] A tilting drive is connected to the base frame in a transmission manner, and the tilting drive is used to drive the base frame to rotate between a first position and a second position;
[0025] When the base frame is in the first position, the first side of the base frame faces upward; when the base frame is in the second position, the first side of the base frame faces downward.
[0026] This invention relates to an automated phosphogypsum concrete sound barrier mold. A base plate and multiple movable side plates are mounted on a frame. These side plates can move closer to or further away from the base plate under the drive of a driving component, allowing the mold to switch between a pouring state and a demolding state. In the pouring state, the side plates and base plate close together to form a pouring groove, which receives the phosphogypsum concrete for subsequent processing and shaping into strips. After the strips are processed, the mold can switch to a demolding state under the drive of the driving component, separating the side plates from the formed strips for removal from the mold. Therefore, this automated phosphogypsum concrete sound barrier mold can quickly separate the formed strips from the mold, making it suitable for molding materials with fast setting speeds, such as phosphogypsum concrete. This effectively solves the problem in existing technologies where molds are difficult to demold quickly and are unsuitable for producing phosphogypsum concrete strips. Attached Figure Description
[0027] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0028] Figure 1 This is a schematic diagram of the automated phosphogypsum concrete sound barrier mold provided in this embodiment of the utility model.
[0029] Figure 2 This is a schematic diagram of the automated phosphogypsum concrete sound barrier mold in the pouring state provided in this embodiment of the utility model.
[0030] Figure 3 This is a schematic diagram of the automated phosphogypsum concrete sound barrier mold in the demolding state provided in this embodiment of the utility model.
[0031] Figure 4 This is an exploded view of the automated phosphogypsum concrete sound barrier mold provided in this embodiment of the utility model.
[0032] Figure 5 This is a schematic diagram of the connection between the side plate and the drive assembly provided in an embodiment of the present invention.
[0033] Figure 6 This is a schematic diagram of the automated phosphogypsum concrete sound barrier mold (including a flipping drive component) provided in this embodiment of the utility model.
[0034] Figure label:
[0035] 1. Automated phosphogypsum concrete sound barrier mold; 2. Strip panels;
[0036] 11. Base frame; 12. Base plate;
[0037] 13. Side plate; 131. First side plate; 132. Second side plate; 1321. Protrusion; 1322. Groove; 133. Guide rod;
[0038] 14. Drive assembly; 141. Drive component; 142. Guide seat;
[0039] 15. Flip drive. Detailed Implementation
[0040] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0041] The following is combined Figures 1-6 This invention describes an automated phosphogypsum concrete sound barrier mold.
[0042] like Figures 1 to 3 as well as Figure 6 As shown, this embodiment provides an automated phosphogypsum concrete sound barrier mold 1, including: a base frame 11, a base plate 12, side plates 13, and a drive assembly 14. The base plate 12 is mounted on the first side of the base frame 11, and multiple side plates 13 are movably disposed on the first side of the base frame 11. The drive assembly 14 is connected to the multiple side plates 13 respectively to drive each side plate 13 to move relative to the base plate 12, so as to switch the automated phosphogypsum concrete sound barrier mold 1 between a pouring state and a demolding state. When the automated phosphogypsum concrete sound barrier mold 1 is in the pouring state, the multiple side plates 13 are connected end to end and surround the base plate 12 to form a pouring groove; when the automated phosphogypsum concrete sound barrier mold 1 is in the demolding state, the side plates 13 are separated from each other and away from the base plate 12.
[0043] In this embodiment, the base frame 11 is used to install and support other components of the automated phosphogypsum concrete sound barrier mold 1. The base frame 11 is equipped with a base plate 12 and multiple movable side plates 13. The base plate 12 is used to form the bottom wall of the pouring trough. The multiple side plates 13 are arranged around the base plate 12 and can move closer to or further away from the base plate 12 under the drive of the drive assembly 14, so that the automated phosphogypsum concrete sound barrier mold 1 can switch between the pouring state and the demolding state.
[0044] like Figure 2 As shown, in the pouring state, each side plate 13 is close to and in contact with the bottom plate 12. Multiple side plates 13 are connected end to end to form a hollow frame structure. The bottom plate 12 is sealed on one side of the frame structure to form the bottom wall of the pouring trough. Multiple side plates 13 form the side walls of the pouring trough. Multiple side plates 13 and the bottom plate 12 together form an open pouring trough. It can be understood that by reasonably designing the size and shape of the bottom plate 12 and the side plates 13, the shape of the pouring trough can be adapted to the strip 2 to be produced, so that the raw materials of the strip 2 (phosphogypsum concrete, cement, etc.) can be poured into the pouring trough for processing and shaping.
[0045] After the raw materials in the pouring tank are vibrated and compacted to form the strip 2, the drive component 14 can be controlled to switch the automated phosphogypsum concrete sound barrier mold 1 to the demolding state (e.g., Figure 3 As shown), during the switching process, each side plate 13 separates from each other and moves away from the bottom plate 12, thereby separating from the formed strip 2 so that the formed strip 2 can be removed from the mold and demolding is completed.
[0046] The automated phosphogypsum concrete sound barrier mold 1 of this invention features a base plate 12 and multiple movable side plates 13 mounted on a base frame 11. These side plates 13 can move closer to or further away from the base plate 12 under the drive of a drive assembly 14, allowing the automated phosphogypsum concrete sound barrier mold 1 to switch between a pouring state and a demolding state. In the pouring state, the multiple side plates 13 and the base plate 12 can close together to form a pouring trough, which receives the phosphogypsum concrete for subsequent processing and shaping. After the phosphogypsum concrete is processed into strips 2, the automated phosphogypsum concrete sound barrier mold 1 can switch to a demolding state under the drive of the drive assembly 14, separating the side plates 13 from the formed strips 2, allowing the formed strips 2 to be removed from the mold. As can be seen from the above, the automated phosphogypsum concrete sound barrier mold 1 of this utility model can quickly separate from the strip 2 after the strip 2 on the mold is formed. It is suitable for the molding of raw materials with a fast solidification speed, such as phosphogypsum concrete, and effectively solves the problem that existing molds are difficult to demold quickly and are not suitable for the production of phosphogypsum concrete strips.
[0047] Understandably, the drive assembly 14 can be connected to the upper-level control system and automatically control the side plate 13 to move under the control of the control system, so as to switch the automated phosphogypsum concrete sound barrier mold 1 between the pouring state and the demolding state; or, the drive assembly 14 can also be equipped with a control switch, and the production personnel can manually control the automated phosphogypsum concrete sound barrier mold 1 to switch between the pouring state and the demolding state through the control switch.
[0048] Specifically, in some embodiments, such as Figures 2 to 5As shown, the side plate 13 includes two first side plates 131 and two second side plates 132. The two first side plates 131 are arranged opposite each other at a distance along the length direction of the base plate 12, and the two second side plates 132 are arranged opposite each other at a distance along the width direction of the base plate 12. The base plate 12 is located between the two first side plates 131 and the two second side plates 132. The driving assembly 14 is used to drive the two first side plates 131 to move closer or further away from each other, and to drive the two second side plates 132 to move closer or further away from each other.
[0049] It is understood that the strip 2 is usually a rectangular plate, and correspondingly, in order to fit the shape of the strip 2, the base plate 12 is also usually designed as a rectangular plate. The length direction of the base plate 12 is the direction in which the long side of the base plate 12 extends, and the width direction of the base plate 12 is the direction in which the wide side of the base plate 12 extends. In this embodiment, two first side plates 131 and two second side plates 132 surround the outside of the base plate 12, wherein the first side plates 131 and the second side plates 132 are perpendicular to each other, the wide side plates 131 and the base plate 12 are arranged opposite each other, and the long side plates 132 and the base plate 12 are arranged opposite each other. In the pouring state, the two first side plates 131 and the two second side plates 132 approach each other under the drive of the drive assembly 14. The two ends of the first side plate 131 contact the two second side plates 132 respectively, and the four side plates 13 contact the bottom plate 12 respectively to form a pouring groove for pouring. When demolding is required, the drive assembly 14 can drive the two first side plates 131 and the two second side plates 132 away from each other to separate from the strip 2 formed in the pouring groove.
[0050] Specifically, in some embodiments, such as Figures 2 to 5 As shown, the drive assembly 14 includes a plurality of drive members 141, each side plate 13 being connected to at least one drive member 141 in a corresponding transmission manner, and the drive member 141 being used to drive the corresponding side plate 13 to slide relative to the base plate 12.
[0051] In this embodiment, each side plate 13 is provided with at least one driving member 141. These driving members 141 are used to drive the side plate 13 connected to it to slide closer to or further away from the bottom plate 12, so that the side plate 13 and the bottom plate 12 can contact and enclose to form a casting groove, or separate the side plate 13 from the strip plate 2 formed in the casting groove, thereby realizing the switching of the automated phosphogypsum concrete sound barrier mold 1 between the casting state and the demolding state.
[0052] Optionally, the drive component 141 can be a cylinder, with the cylinder body mounted on the base frame 11 and the piston rod of the cylinder connected to the corresponding side plate 13.
[0053] Optionally, in some embodiments, each side plate 13 is connected to a plurality of driving members 141, and the plurality of driving members 141 are arranged at intervals along the length direction of the corresponding side plate 13.
[0054] In this embodiment, by providing multiple driving elements 141 for each side plate 13, the multiple driving elements 141 for driving a certain side plate 13 are arranged at intervals along the length direction of the side plate 13. The multiple driving elements 141 can jointly drive the side plate 13 to move closer to or away from the bottom plate 12, thereby dispersing the force on the side plate 13 along the length direction during the movement, and making the sliding of the side plate 13 more stable and reliable.
[0055] In some embodiments, the drive assembly 14 further includes a plurality of guide seats 142, each side plate 13 being disposed corresponding to at least one guide seat 142, and the side plate 13 being slidably disposed on the guide seat 142.
[0056] In this embodiment, each side plate 13 is provided with at least one guide seat 142. These guide seats 142 are used to slide with the corresponding side plate 13 to limit the movement direction of the side plate 13 and guide the movement of the side plate 13 in conjunction with the drive member 141, so that the side plate 13 can move more smoothly and reliably.
[0057] In some embodiments, each side plate 13 is correspondingly provided with a plurality of guide seats 142, and the plurality of guide seats 142 are arranged at intervals along the length direction of the corresponding side plate 13.
[0058] In this embodiment, by providing multiple guide seats 142 for each side plate 13, and arranging the multiple guide seats 142 at intervals along the length direction of the corresponding side plate 13, the multiple guide seats 142 can jointly guide and limit the side plate 13, thereby dispersing the force on the side plate 13 along the length direction during the movement, and thus making the sliding of the side plate 13 more stable and reliable.
[0059] Specifically, in some embodiments, such as Figure 4 and Figure 5 As shown, the guide seat 142 has a guide hole, and the side plate 13 is provided with a guide rod 133, which is slidably inserted into the corresponding guide hole.
[0060] In this embodiment, by providing matching guide holes and guide rods 133 on the guide seat 142 and the side plate 13 respectively, the guide rods 133 are slidably inserted into the guide holes. The guide holes and guide rods 133 cooperate with each other, so that the guide rods 133 and the side plate 13 connected thereto can move only along the axial direction of the guide rods 133, thereby achieving the limiting and guiding function of the side plate 13.
[0061] Specifically, in some embodiments, such as Figure 5 As shown, one second side plate 132 has a protrusion 1321 on the side facing the casting groove, and the other second side plate 132 has a groove 1322 on the side facing the casting groove.
[0062] In this embodiment, by providing protrusions 1321 and grooves 1322 on the two second side plates 132 respectively, after the strip plate 2 is formed, the two opposite sides of the strip plate 2 can respectively form a recessed structure corresponding to the protrusion 1321 and a protruding structure corresponding to the groove 1322. The protrusion 1321 is embedded in the recessed structure on the strip plate 2, and the protruding structure on the strip plate 2 is embedded in the groove 1322. On the one hand, the protruding structure and the recessed structure are the design requirements of the strip plate 2. On the other hand, the protruding structure and the recessed structure can cooperate with each other on the protrusion 1321 and the groove 1322 on the second side plate 132 so as to better fix the strip plate 2 in the casting groove before demolding.
[0063] Optionally, in some embodiments, there are multiple base plates 12, and the side of the base plate 12 opposite to the base frame 11 is constructed with a corrugated surface. The corrugated surfaces of the multiple base plates 12 have different specifications, and the base frame 11 and the multiple base plates 12 are detachably connected.
[0064] In this embodiment, by constructing a corrugated surface on the side of the base plate 12 facing the casting groove, after the strip 2 in the casting groove is formed, the side of the strip 2 opposite to the base plate 12 can also form a corrugated structure that fits the corrugated surface, thus meeting the performance requirements of the strip 2 required for the sound barrier. Simultaneously, by configuring multiple base plates 12 for the mold, each base plate 12 has a different corrugated surface specification, and each base plate 12 can be detachably connected to the base frame 11, allowing production personnel to replace the base plate 12 installed on the base frame 11 according to production needs, thereby forming the required corrugated structure on the strip 2.
[0065] It is understandable that a corrugated surface is usually composed of multiple corrugated protrusions arranged in a certain pattern, such as multiple corrugated protrusions arranged side by side with intervals. The specifications of a corrugated surface include, but are not limited to, the shape, size, arrangement, and spacing between adjacent corrugated protrusions.
[0066] In some embodiments, such as Figure 6 As shown, the automated phosphogypsum concrete sound barrier mold 1 further includes a tilting drive 15, which is connected to the base frame 11 via a transmission connection. The tilting drive 15 is used to drive the base frame 11 to rotate between a first position and a second position. When the base frame 11 is in the first position, the first side of the base frame 11 faces upward; when the base frame 11 is in the second position, the first side of the base frame 11 faces downward.
[0067] In this embodiment, a flipping drive 15 is provided to drive the base frame 11 to rotate, so as to facilitate the adjustment of the angle of the base frame 11 for casting and demolding of the strip 2. Specifically, before pouring, the tilting drive 15 can be controlled to adjust the base frame 11 to the first position, and the drive assembly 14 can be controlled to switch the automated phosphogypsum concrete sound barrier mold 1 to the pouring state. In this state, each side plate 13 and the base plate 12 surround to form a pouring trough. The bottom wall of the pouring trough is set horizontally and the trough opening faces upward, so as to facilitate the pouring of the raw materials (phosphogypsum concrete, cement, etc.) of the strip 2 into the pouring trough for processing and shaping. After the strip 2 is formed, the tilting drive 15 can be controlled to tilt the base frame 11 to the second position, and the drive assembly 14 can be controlled to switch the automated phosphogypsum concrete sound barrier mold 1 to the demolding state. In this state, each side plate 13 separates from the formed strip 2. The formed strip 2 separates from the base plate 12 under the action of gravity and falls down, thereby realizing the demolding of the strip 2.
[0068] It is understandable that when demolding strip 2, a receiving device can be set under the base frame 11. The receiving device is used to receive the falling strip 2 and play a certain buffering role to avoid damage to strip 2 after falling.
[0069] The automated phosphogypsum concrete sound barrier mold 1 based on the above embodiment has the following casting and molding process for the strip 2:
[0070] First, control the flipping drive 15 to flip the base frame 11 to the first position so that the first side of the base frame 11 faces upward, and control the drive assembly 14 to drive each side plate 13 to approach the base plate 12 and surround the base plate 12 to form a pouring groove. In this state, the opening of the pouring groove faces upward for pouring phosphogypsum concrete.
[0071] After pouring, a vibrating device can be used to vibrate, compact, and level the phosphogypsum concrete in the pouring trench, and then wait for the phosphogypsum concrete to solidify and take shape.
[0072] After the phosphogypsum concrete has solidified, the flipping drive 15 is controlled to flip the base frame 11 180° to the second position, so that the first side of the base frame 11 faces down, so that the opening of the casting trough faces down and is directly opposite the receiving platform below the base frame 11.
[0073] After the flipping is completed, the drive assembly 14 is activated to drive each side plate 13 away from the bottom plate 12 and detach it from the blank of the strip plate 2 formed in the casting groove. The blank detaches from the bottom plate under the action of gravity and falls onto the receiving platform.
[0074] After the blank of strip 2 falls off, control the flipping drive 15 to flip the base frame 11 back to the first position so that the next pouring can be carried out.
[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.
Claims
1. An automated mold for phosphogypsum concrete sound barriers, characterized in that, include: Base frame; A base plate is installed on the first side of the base frame; Multiple side plates are movably mounted on the first side of the base frame; The drive assembly is connected to the multiple side plates respectively to drive each side plate to move relative to the base plate, so as to switch the automated phosphogypsum concrete sound barrier mold between the pouring state and the demolding state. When the automated phosphogypsum concrete sound barrier mold is in the pouring state, multiple side plates are connected end to end and together with the bottom plate to form a pouring groove. When the automated phosphogypsum concrete sound barrier mold is in the demolded state, each of the side plates separates from each other and moves away from the base plate.
2. The automated phosphogypsum concrete sound barrier mold according to claim 1, characterized in that, The side plate includes: Two first side plates are arranged opposite each other at intervals along the length of the base plate; Two second side plates are arranged opposite each other at intervals along the width direction of the base plate; The drive assembly is used to drive the two first side plates to move closer or further apart from each other, and to drive the two second side plates to move closer or further apart from each other.
3. The automated phosphogypsum concrete sound barrier mold according to claim 2, characterized in that, One of the second side plates has a protrusion on the side facing the casting groove, and the other second side plate has a groove on the side facing the casting groove.
4. The automated phosphogypsum concrete sound barrier mold according to claim 1, characterized in that, The driving component includes: Multiple driving components are provided, and each side plate is connected to at least one driving component in a corresponding transmission manner. The driving component is used to drive the corresponding side plate to slide relative to the base plate.
5. The automated phosphogypsum concrete sound barrier mold according to claim 4, characterized in that, Each of the side plates is connected to a plurality of driving components, and the plurality of driving components are arranged at intervals along the length direction of the corresponding side plate.
6. The automated phosphogypsum concrete sound barrier mold according to claim 4, characterized in that, The driving component also includes: Multiple guide seats, each of the side plates is disposed corresponding to at least one of the guide seats, and the side plates are slidably disposed on the guide seats.
7. The automated phosphogypsum concrete sound barrier mold according to claim 6, characterized in that, Each of the side plates is correspondingly provided with a plurality of guide seats, and the plurality of guide seats are arranged at intervals along the length direction of the corresponding side plate.
8. The automated phosphogypsum concrete sound barrier mold according to claim 6, characterized in that, The guide seat has a guide hole, and the side plate is provided with a guide rod, which is slidably inserted into the corresponding guide hole.
9. The automated phosphogypsum concrete sound barrier mold according to claim 1, characterized in that, There are multiple base plates, and the side of each base plate opposite to the base frame is constructed with a corrugated surface. The specifications of the corrugated surfaces of the multiple base plates are different, and the base frame and one of the multiple base plates are detachably connected.
10. The automated phosphogypsum concrete sound barrier mold according to any one of claims 1 to 9, characterized in that, Also includes: A tilting drive is connected to the base frame in a transmission manner, and the tilting drive is used to drive the base frame to rotate between a first position and a second position; When the base frame is in the first position, the first side of the base frame faces upward; when the base frame is in the second position, the first side of the base frame faces downward.