Profiling equipment for graphite electrode manufacturing

Abstract

The utility model belongs to the technical field of graphite electrode manufacturing, and particularly relates to profiling equipment for graphite electrode manufacturing. A hydraulic cylinder is fixedly connected to the side wall of the workbench. The output end of the hydraulic cylinder is fixedly connected with an extrusion plate; a template is arranged on the upper surface of the workbench through a replacement part; a plurality of groups of extrusion blocks are fixedly connected to the side wall of the template; a placing groove is formed in the upper surface of the workbench; a mold is placed on the upper surface of the workbench; raw materials are placed in the mold; the bottom of the workbench is fixedly connected with a pair of symmetrically-distributed L-shaped bearing strips. An L-shaped plate is placed between the pair of L-shaped bearing strips; a plurality of groups of grooves are formed in the L-shaped plate; an electrode shell is placed in the groove; and under the action of the replacement piece, the template can be replaced, so that the extrusion blocks on the template correspond to the extrusion shapes of different molds, and the flexibility of the equipment is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to graphite electrode manufacturing technical field, concretely is a kind of profile equipment for graphite electrode manufacturing. BACKGROUND

[0002] Graphite electrode is a kind of high-temperature-resistant graphite conductive material, mainly petroleum coke, needle coke is raw material, coal pitch does binder, is made after multiple processes, and graphite electrode has multiple advantages, such as easy processing, discharge processing removal rate is high, and graphite loss is small.

[0003] The existing graphite electrode extrusion forming equipment often needs to replace the die set in the extrusion forming equipment when extruding different models of graphite electrodes, but most of the existing equipment is more troublesome to replace the die set in the equipment, which directly leads to the increase of the downtime of the production line, and affects the continuity and stability of the production line, thereby reducing the overall production efficiency;Therefore, in view of the above problems, a kind of profile equipment for graphite electrode manufacturing is proposed. UTILITY MODEL CONTENTS

[0004] In order to make up for the deficiency of the prior art, the existing graphite electrode extrusion forming equipment often needs to replace the die set in the extrusion forming equipment when extruding different models of graphite electrodes, but most of the existing equipment is more troublesome to replace the die set in the equipment, which directly leads to the increase of the downtime of the production line, and affects the continuity and stability of the production line, thereby reducing the overall production efficiency problem, the utility model provides a kind of profile equipment for graphite electrode manufacturing.

[0005] The utility model solves the technical scheme that the utility model discloses a kind of profile equipment for graphite electrode manufacturing, including workbench;The side wall of the workbench is fixedly connected with hydraulic cylinder;The output end of the hydraulic cylinder is fixedly connected with extrusion plate;The upper surface of the workbench is provided with die plate by replacement piece;The side wall of the die plate is fixedly connected with multiple extrusion blocks;The upper surface of the workbench is provided with placing groove;The upper surface of the workbench is placed with mould;The mould is placed with raw material;The bottom of the workbench is fixedly connected with a pair of symmetrically distributed L-shaped support strips;A pair of L-shaped support strips are placed with L-shaped plate;The L-shaped plate is provided with multiple grooves;The electrode shell is placed in the groove, under the action of replacement piece, the die plate can be replaced, the extrusion block on the die plate corresponds the extrusion shape of different moulds, improve the flexibility of equipment.

[0006] Preferably, the displacement piece comprises support columns; the upper surface of the workbench is fixed with a plurality of groups of support columns; the side wall of the template is provided with a plurality of groups of first circular through grooves; the first circular through grooves are matched with the support columns; the outer circular wall of the support column is slidably connected with a gasket; the gasket and the workbench are fixed with springs, and the workers can lift the template upwards to separate the template from the support columns, so that the workers can quickly replace different templates, simplify the operation of the workers, and improve the overall working efficiency.

[0007] Preferably, the outer circular wall of the support column is provided with a pair of sliding grooves; the groove wall of the sliding groove is slidably connected with a sliding block; the sliding block is fixed on the gasket, so that the workers can conveniently replace the template or wait for the next time to extrude the mold, thereby bringing accuracy control and reliability to the movement of the template on the workbench.

[0008] Preferably, the side wall of the L-shaped plate is provided with a horizontal plate; the side wall of the horizontal plate is provided with a plurality of groups of second circular through grooves; the side wall of the horizontal plate is fixed with a plurality of groups of positioning tubes; the positioning tubes are matched with the second circular through grooves; the positioning tubes are matched with the electrode shell, and the positioning tubes can play a guiding role and can ensure the stability and accuracy of the raw materials in the extrusion process.

[0009] Preferably, the side wall of the workbench is fixed with a pair of symmetrically distributed L-shaped blocks, so that the mold can correspond to the extrusion block and the electrode sleeve, and play a positioning assisting role.

[0010] Preferably, the bottom of the horizontal plate is fixed with a pair of long strips; the two side groove walls of the placing groove are provided with sliding grooves; the long strips are placed in the sliding grooves; the groove wall of the sliding groove is provided with a clamping groove; the groove wall of the clamping groove is slidably connected with a trapezoidal block; the trapezoidal block and the clamping groove are fixed with springs; the side wall of the long strip is provided with a limiting groove; and the limiting groove is matched with the trapezoidal block.

[0011] Preferably, the groove wall of the sliding groove is provided with a round corner, so that the long strip can enter the sliding groove.

[0012] Preferably, the side wall of the L-shaped plate is fixed with a handle, so that the workers can more stably pull out the L-shaped plate on the workbench.

[0013] The utility model discloses the beneficial effect lies in:

[0014] 1. The raw materials on the mold are extruded downwards, the L-shaped plate is placed below the workbench, the motor shell on the L-shaped plate is in the recess, so that the extrusion block can extrude the raw materials into the electrode shell, the extrusion forming operation of the graphite electrode is completed, the template can be replaced under the action of the displacement piece, the extrusion block on the template corresponds to the extrusion shape of different molds, and the flexibility of the equipment is improved.

[0015] 2. The staff can lift the template upwards, so that the template is separated from the supporting column, so that the staff can quickly replace different templates, which simplifies the operation of the staff, thereby improving the overall work efficiency, facilitating the staff to replace the template or wait for the next time to extrude the mold, so that the movement of the template on the workbench brings accurate control and reliability.

[0016] The above-mentioned content related to the description of the utility model is only a summary of the technical scheme of the present application. In order to enable those skilled in the art to more clearly understand the technical scheme of the present application, and then can be implemented according to the content of the description and the drawings, and in order to let the above-mentioned purpose and other purposes, characteristics and advantages of the present application can be more easily understood, the following is described in combination with the specific embodiments of the present application and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings are only used to show the principles, implementation modes, applications, characteristics and effects of the specific embodiments of the present application and other related contents, and cannot be considered as a limitation of the present application.

[0018] In the drawings of the specification:

[0019] Figure 1 It is a perspective view of the utility model;

[0020] Figure 2 It is a partial sectional view of the utility model;

[0021] Figure 3 It is a partial sectional view of the supporting column;

[0022] Figure 4 It is an explosion view of the utility model;

[0023] Figure 5 It is a partial sectional view of the workbench.

[0024] The reference signs involved in the above-mentioned drawings are explained as follows:

[0025] 1, workbench; 2, hydraulic cylinder; 3, extrusion plate; 4, template; 5, extrusion block; 6, mold; 7, raw material; 8, L-shaped supporting strip; 9, L-shaped plate; 10, electrode shell; 11, supporting column; 12, gasket; 13, sliding groove; 14, sliding block; 15, cross plate; 16, positioning pipe; 17, L-shaped block; 18, long strip; 19, sliding groove; 20, clamping groove; 21, trapezoidal block; 22, limiting groove. DETAILED DESCRIPTION

[0026] To explain possible application scenarios, technical principles, specific embodiments, and the purposes and effects of the present application in detail, the following will be described in detail in combination with specific embodiments and with reference to the drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0027] In this paper, the term "embodiment" means that the specific features, structures or properties described in combination with the embodiment can be included in at least one embodiment of the present application. The term "embodiment" appearing at various places in the specification does not necessarily refer to the same embodiment, and does not particularly limit its independence or association with other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, each technical feature mentioned in each embodiment can be combined in any way to form a corresponding implementable technical solution.

[0028] Unless otherwise defined, the meanings of the technical terms used herein are the same as those commonly understood by those skilled in the art to which the present application belongs; the use of related terms herein is only for the purpose of describing specific embodiments, and is not intended to limit the present application.

[0029] In the description of the present application, the phrase "and / or" is a description of the logical relationship between the objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this paper generally represents that the associated objects before and after are a "or" logical relationship.

[0030] In the present application, terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantity, primary and secondary or order relationship between the entities or operations.

[0031] Without more limitations, in the present application, the "includes", "contains", "has" or other similar open expressions used in the sentence are intended to cover non-exclusive inclusion, and these expressions do not exclude the presence of other elements in the process, method or product including the described elements, so that the process, method or product including a series of elements can not only include those limited elements, but also include other elements not explicitly listed, or also include elements inherent to such process, method or product.

[0032] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments in this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.

[0033] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0034] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral arrangement; it can be a direct connection or an indirect connection through an intermediate medium; it can be a relationship of two components combined together, an interaction relationship between two components, or a connection within two structures. Those skilled in the art to which this application pertains can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0035] Please see Figures 1-5As shown, a molding equipment for manufacturing graphite electrodes includes a worktable 1; a hydraulic cylinder 2 is fixedly connected to the side wall of the worktable 1; an extrusion plate 3 is fixedly connected to the output end of the hydraulic cylinder 2; a template 4 is provided on the upper surface of the worktable 1 via a replacement component; multiple sets of extrusion blocks 5 are fixedly connected to the side wall of the template 4; a placement groove is provided on the upper surface of the worktable 1; a mold 6 is placed on the upper surface of the worktable 1; raw material 7 is placed inside the mold 6; a pair of symmetrically distributed L-shaped support strips 8 are fixedly connected to the bottom of the worktable 1; an L-shaped plate 9 is placed between the pair of L-shaped support strips 8; multiple sets of grooves are provided inside the L-shaped plate 9; an electrode shell 1 is placed inside the groove. 0; During operation, by placing the mold 6 with raw material 7 on the surface of the workbench 1, the hydraulic cylinder 2 drives the extrusion plate 3 to move downward, thereby the extrusion plate 3 will drive the template 4 to move downward, and then the extrusion block 5 on the template 4 will enter the mold 6, extruding the raw material 7 on the mold 6 downward. Since an L-shaped plate 9 is placed below the workbench 1, and the motor housing on the L-shaped plate 9 is in the groove, the extrusion block 5 will extrude the raw material 7 into the electrode housing 10, completing the extrusion molding operation of the graphite electrode. With the action of the replacement part, the template 4 can be replaced, so that the extrusion block 5 on the template 4 corresponds to the extrusion shape of different molds 6, improving the flexibility of the equipment.

[0036] The replacement component includes a support column 11; multiple sets of support columns 11 are fixedly connected to the upper surface of the workbench 1; multiple sets of first circular through grooves are provided on the side wall of the template 4; the first circular through grooves are matched with the support columns 11; a shim 12 is slidably connected to the outer circular wall of the support column 11; a spring is fixedly connected between the shim 12 and the workbench 1; during operation, the shim 12 slides on the support column 11, and after the extrusion plate 3 extrudes the template 4, the spring force will drive the shim 12 to move upward on the support column 11, thereby causing the template 4 to move upward by the shim 12. Since the template 4 slides on the support column 11 through the first circular through groove, the operator can lift the template 4 upward to separate the template 4 from the support column 11. This allows the operator to quickly replace different templates 4, simplifying the operator's operation and improving the overall work efficiency.

[0037] The outer circular wall of the support column 11 is provided with a pair of sliding grooves 13; the groove wall of the sliding groove 13 is slidably connected to a slider 14; the slider 14 is fixed to the pad 12; during operation, the slider 14 slides in the sliding groove 13, thereby the slider 14 drives the pad 12 to slide. After the sliding groove 13 limits the rising height of the pad 12, whenever the extrusion plate 3 extrudes and resets, the spring force will cause the pad 12 to drive the template 4 to rise to the outer circular wall of the top of the support column 11, which is convenient for the staff to replace the template 4 or to prepare for the next extrusion of the mold 6. This brings precise control and reliability to the movement of the template 4 on the worktable 1.

[0038] A horizontal plate 15 is placed on the side wall of the L-shaped plate 9; the side wall of the horizontal plate 15 is provided with multiple sets of second circular through slots; multiple sets of positioning tubes 16 are fixedly connected to the side wall of the horizontal plate 15; the positioning tubes 16 match the second circular through slots; the positioning tubes 16 match the electrode shell 10; during operation, when the L-shaped plate 9 drives the positioning tubes 16 to be below the worktable 1 via the L-shaped support strip 8, the horizontal plate 15 will be in the placement slot of the worktable 1 on the L-shaped plate 9, and the horizontal plate 15 will be on the same horizontal plane as the worktable 1. Thus, the second circular through slot on the horizontal plate 15 will correspond to the raw material 7 on the mold 6. At this time, the positioning tubes 16 on the horizontal plate 15 will also be sleeved on the outer surface of the electrode shell 10. In this way, the positioning tubes 16 can play a guiding role when the raw material 7 enters the electrode shell 10, which can ensure the stability and accuracy of the raw material 7 during the extrusion process.

[0039] A pair of symmetrically distributed L-shaped blocks 17 are fixed to the side wall of the workbench 1. During operation, the pair of L-shaped blocks 17 on the workbench 1 allow the mold 6 to be placed on both sides of the mold 6 corresponding to the L-shaped blocks 17 when the mold 6 is on the workbench 1. This facilitates the alignment of the mold 6 with the extrusion block 5 and the electrode sleeve, thus playing a role in positioning assistance.

[0040] A pair of long strips 18 are fixedly connected to the bottom of the horizontal plate 15; both sides of the placement groove are provided with sliding grooves 19; the long strips 18 are placed in the sliding grooves 19; the groove wall of the sliding groove 19 is provided with a locking groove 20; a trapezoidal block 21 is slidably connected to the groove wall of the locking groove 20; a spring is fixedly connected between the trapezoidal block 21 and the locking groove 20; the side wall of the long strips 18 is provided with a limiting groove 22; the limiting groove 22 matches the trapezoidal block 21; during operation, when the horizontal plate 15 enters the placement groove of the workbench 1 along with the L-shaped plate 9, the long strips 18 on the horizontal plate 15 will enter the sliding groove 19, and under electric... After the L-shaped plate 9 is extruded and molded, the trapezoidal block 21 in the slot 20 will enter the limiting groove 22 of the strip 18 under the elastic force of the spring. At this time, the worker moves the L-shaped plate 9 downward to separate the electrode shell 10 on the L-shaped plate 9 from the positioning tube 16 on the horizontal plate 15. When it is necessary to replace the electrode shell 10 of a different model, the horizontal plate 15 is pulled outward, and the trapezoidal block 21 will be squeezed against the limiting groove 22. The trapezoidal block 21 will enter the slot 20 under the pressure, so that the horizontal plate 15 is separated from the worktable 1, which makes it convenient for the worker to take out the electrode shell and replace the horizontal plate 15.

[0041] The wall of the sliding groove 19 is rounded, which makes it easier for the long strip 18 to enter the sliding groove 19.

[0042] A handle is fixed to the side wall of the L-shaped plate 9; during operation, the handle on the L-shaped plate 9 allows the operator to more stably pull out and release the L-shaped plate 9 on the workbench 1.

[0043] The working principle is as follows: A mold 6 containing raw material 7 is placed on the surface of the worktable 1. A hydraulic cylinder 2 drives an extrusion plate 3 downwards, which in turn moves a template 4 downwards. The extrusion block 5 on the template 4 then enters the mold 6, extruding the raw material 7 downwards. Since an L-shaped plate 9 is placed below the worktable 1, and the motor housing on the L-shaped plate 9 is in a groove, the extrusion block 5 extrudes the raw material 7 into the electrode housing 10, completing the extrusion molding of the graphite electrode. With the help of a replacement component, the template 4 can be changed, allowing the extrusion block 5 on the template 4 to correspond to different extrusion shapes of the mold 6, improving efficiency. The equipment is flexible because the pad 12 slides on the support column 11. After the extrusion plate 3 presses the template 4, the spring force will drive the pad 12 to move upward on the support column 11, thus moving the template 4 upward. Since the template 4 slides on the support column 11 through the first circular groove, the operator can lift the template 4 upward to separate it from the support column 11. This allows the operator to quickly change different templates 4, simplifying the operation and improving overall work efficiency. The slider 14 slides in the slide groove 13, thereby driving the pad 12 to slide in the slide groove 13. After the limit shim 12 rises to its designated height, each time the extrusion plate 3 is extruded and reset, the spring force will cause the shim 12 to lift the template 4 to the outer circular wall at the top of the support column 11. This facilitates the replacement of the template 4 by the operator or prepares it for the next extrusion of the mold 6. This provides precise control and reliability for the movement of the template 4 on the worktable 1. When the L-shaped plate 9, through the horizontal plate 15 on the L-shaped plate 9, drives the positioning tube 16 to be positioned below the worktable 1 via the L-shaped support strip 8, the horizontal plate 15 will be placed in the slot on the worktable 1. The horizontal plate 15 will be on the same horizontal plane as the worktable 1, thus the second circular groove on the horizontal plate 15 will... Corresponding to the raw material 7 on the mold 6, the positioning tube 16 on the horizontal plate 15 will also be fitted onto the outer surface of the electrode shell 10. In this way, the positioning tube 16 can guide the raw material 7 as it enters the electrode shell 10, ensuring the stability and accuracy of the raw material 7 during the extrusion process. With a pair of L-shaped blocks 17 on the worktable 1, when the mold 6 is on the worktable 1, the two sides of the mold 6 are placed in accordance with the L-shaped blocks 17, which makes it convenient for the mold 6 to correspond with the extrusion block 5 and the electrode shell, thus playing a positioning assistance role. With the handle on the L-shaped plate 9, the operator can more stably pull out and put in the L-shaped plate 9 on the worktable 1.When the horizontal plate 15, along with the L-shaped plate 9, enters the placement slot of the worktable 1, the long strip 18 on the horizontal plate 15 will enter the sliding groove 19. After the electrode is extruded and formed, when the operator removes the L-shaped plate 9, the trapezoidal block 21 in the slot 20 will enter the limiting groove 22 of the long strip 18 due to the spring force. At this time, the operator moves the L-shaped plate 9 downward, separating the electrode shell 10 on the L-shaped plate 9 from the positioning tube 16 on the horizontal plate 15. When it is necessary to replace a different model of electrode shell 10, the horizontal plate 15 is pulled outward, and the trapezoidal block 21 will be squeezed against the limiting groove 22. The trapezoidal block 21, under pressure, will enter the slot 20, allowing the horizontal plate 15 to detach from the worktable 1, making it convenient for the operator to remove the electrode shell and replace the horizontal plate 15. The outer rounded corner of the sliding groove 19 wall facilitates the entry of the long strip 18 into the sliding groove 19.

[0044] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application 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 or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A molding apparatus for manufacturing graphite electrodes, characterized in that: The system includes a workbench (1); a hydraulic cylinder (2) is fixedly connected to the side wall of the workbench (1); an extrusion plate (3) is fixedly connected to the output end of the hydraulic cylinder (2); a template (4) is provided on the upper surface of the workbench (1) through a replacement component; multiple sets of extrusion blocks (5) are fixedly connected to the side wall of the template (4); a placement groove is provided on the upper surface of the workbench (1); a mold (6) is placed on the upper surface of the workbench (1); raw material (7) is placed in the mold (6); a pair of symmetrically distributed L-shaped support strips (8) are fixedly connected to the bottom of the workbench (1); an L-shaped plate (9) is placed between the pair of L-shaped support strips (8); multiple sets of grooves are provided in the L-shaped plate (9); an electrode shell (10) is placed in the groove.

2. The molding equipment for manufacturing graphite electrodes according to claim 1, characterized in that: The replacement component includes a support column (11); multiple sets of support columns (11) are fixedly connected to the upper surface of the workbench (1); multiple sets of first circular through grooves are provided on the side wall of the template (4); the first circular through grooves are matched with the support column (11); a gasket (12) is slidably connected to the outer circular wall of the support column (11); a spring is fixedly connected between the gasket (12) and the workbench (1).

3. The molding equipment for manufacturing graphite electrodes according to claim 2, characterized in that: The outer circular wall of the support column (11) is provided with a pair of sliding grooves (13); the groove wall of the sliding groove (13) is slidably connected to a slider (14); the slider (14) is fixedly connected to the gasket (12).

4. The molding equipment for manufacturing graphite electrodes according to claim 3, characterized in that: A horizontal plate (15) is placed on the side wall of the L-shaped plate (9); the side wall of the horizontal plate (15) is provided with multiple sets of second circular through grooves; multiple sets of positioning tubes (16) are fixed to the side wall of the horizontal plate (15); the positioning tubes (16) are matched with the second circular through grooves; the positioning tubes (16) are matched with the electrode shell (10).

5. The molding equipment for manufacturing graphite electrodes according to claim 4, characterized in that: The side wall of the workbench (1) is fixed with a pair of symmetrically distributed L-shaped blocks (17).

6. The molding equipment for manufacturing graphite electrodes according to claim 5, characterized in that: A pair of long strips (18) are fixedly connected to the bottom of the horizontal plate (15); both sides of the placement groove are provided with sliding grooves (19); the long strips (18) are placed in the sliding grooves (19); the groove wall of the sliding groove (19) is provided with a slot (20); the groove wall of the slot (20) is slidably connected with a trapezoidal block (21); a spring is fixedly connected between the trapezoidal block (21) and the slot (20); the side wall of the long strip (18) is provided with a limiting groove (22); the limiting groove (22) matches the trapezoidal block (21).

7. The molding equipment for manufacturing graphite electrodes according to claim 6, characterized in that: The walls of the sliding groove (19) are rounded.

8. A molding apparatus for manufacturing graphite electrodes according to claim 5, characterized in that: The L-shaped plate (9) has a handle fixed to its side wall.

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