New energy automobile transmission gear green compact forming table

Abstract

The utility model provides a green compact forming table for a new energy automobile transmission gear. The green compact forming table comprises a mounting plate, a lower die assembly is installed on the top face of the installation plate, an upper die assembly is installed on the top face of the installation plate and located above the lower die assembly, a material receiving assembly is installed on the top face of the installation plate and located on one side of the lower die assembly, and a material storage assembly is installed on the top face of the installation plate and located above the material receiving assembly. The lower mold assembly comprises a lower mold table, the top face of the mounting plate is fixedly connected with the lower mold table, a mold groove is formed in the middle of the top face of the lower mold table, a gear ring is installed in the mold groove, the bottom face of the lower mold table is fixedly connected with a U-shaped frame, and the middle of the top face of the U-shaped frame is fixedly connected with a column body. Through mutual cooperation of the lower die assembly, the material receiving assembly, the material storage assembly, the dust receiving assembly, the filter plate, the guide rod and the dust collection assembly, punch forming of the gear is achieved, and redundant powder is recycled.

Description

Technical Field

[0001] The utility model relates to the technical field of gear blank forming, in particular to a new energy vehicle gearbox gear blank forming platform. Background Art

[0002] At present, when the gears in the gearbox of new energy vehicles are produced, first, the material dust is transported to the lower mold through the material taking device, and then, the upper mold is pressed down. At this time, the material dust can be squeezed into the shape of a gear by the cooperation of the lower mold. After extrusion molding, the upper mold is separated, and the lower mold lifts the molded gear from the inner cavity through the hydraulic rod. After lifting, the material taking device pushes the molded gear onto the conveyor belt when feeding, and then transports the taken material to the lower mold. The pushed gear will enter the next process under the action of the conveyor belt, which can facilitate the calcination molding of the gear in the later stage.

[0003] Because, in order to avoid the missing of gears during stamping, the inner cavity of the lower mold is generally filled when filling the material. When the upper mold is pressed down again, part of the material dust inside the lower mold will overflow from the gap between the upper mold and the lower mold, and the overflowed material dust will fall around the lower mold. At this time, the material taking component can push the formed gear and the material dust onto the conveyor belt when loading the material, which will cause the surface of the formed gear to be adhered to the material dust. At this time, the staff needs to use an air gun to clean the surface of the formed gear to avoid the uneven surface of the gear during the later calcination. When the staff is cleaning, it is not only easy to make the material dust difficult to recover, resulting in material waste, but also increases the labor of the staff and reduces the overall production efficiency. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a new energy vehicle gearbox gear blank pressing and forming station, which solves the problems mentioned in the background technology.

[0005] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] A new energy vehicle gearbox gear blank forming station comprises a mounting plate; a lower mold assembly is mounted on the top surface of the mounting plate, an upper mold assembly is mounted on the top surface of the mounting plate and located above the lower mold assembly, a material receiving assembly is mounted on the top surface of the mounting plate and located on one side of the lower mold assembly, a material storage assembly is mounted on the top surface of the mounting plate and located above the material receiving assembly, an ash receiving assembly is mounted on the top surface of the mounting plate and located above the other side of the lower mold assembly, a filter plate is fixedly connected to the other side of the lower mold assembly and located above the ash receiving assembly, a guide rod is fixedly connected to the other side of the lower mold assembly and located above the filter plate, and the mounting plate A dust suction assembly is installed on the top surface; the lower mold assembly includes a lower mold table, the top surface of the mounting plate is fixedly connected to the lower mold table, a mold groove is provided in the middle of the top surface of the lower mold table, a gear ring is installed in the mold groove, the bottom surface of the lower mold table is fixedly connected to a U-shaped frame, the middle of the top surface of the U-shaped frame is fixedly connected to a column, the top surface of the column is fixedly connected to a tooth key column, the outer surface of the column is slidably connected to a lifting frame, one end of the lifting frame is fixedly connected to a tooth ring, the bottom surface of the lower mold table is fixedly connected to a column rod, one side of the column rod is fixedly connected to a lifting hydraulic rod, and one end of the lifting hydraulic rod is fixedly connected to the lifting frame.

[0007] Furthermore, the upper mold assembly includes a bent rod, the top surface of the mounting plate is fixedly connected to the bent rod, one end of the bent rod is fixedly connected to a downward pressure hydraulic rod, and one end of the downward pressure hydraulic rod is fixedly connected to the gear upper model.

[0008] Furthermore, the material receiving assembly includes a material receiving platform, the top surface of the mounting plate is fixedly connected to the material receiving platform, the top surface of the material receiving platform is provided with a T-slot, a T-block is slidably connected in the T-slot, the top surface of the T-block is fixedly connected to a baffle, one end of the material receiving platform is fixedly connected to an auxiliary rod, one side of the auxiliary rod is fixedly connected to a forward hydraulic rod, the output end of the forward hydraulic rod is fixedly connected to a material receiving plate, the top surface of the material receiving plate is provided with a material receiving hole, the two ends of one side of the baffle are respectively fixedly connected to long rods, one end of the long rod passes through the material receiving plate and is slidably connected to the material receiving plate, and a reset damping rod is fixedly connected to one side of the baffle and located between the material receiving plates.

[0009] Furthermore, the material storage assembly includes a material storage hopper, the material storage hopper is fixed on the top surface of the mounting plate, a sealing groove is provided at the discharge end of the material storage hopper, an L-shaped sealing plate is slidably connected in the sealing groove, a tension damping rod is fixedly connected to the outer surface of the material storage hopper and at both ends of the L-shaped sealing plate, one end of the tension damping rod is connected to the L-shaped sealing plate, a dustproof plate is installed on the top surface of the material storage hopper, and a dustproof net is installed on the top surface of the dustproof plate.

[0010] Furthermore, the dust suction assembly includes a dust suction pump, the top surface of the mounting plate is fixedly connected to the dust suction pump, the input end of the dust suction pump is connected to an annular cover through a dust inlet pipe, the outer surface of the gear upper model is fixedly connected to an annular cover, and the output end of the dust suction pump is connected to the inner cavity of the dust proof plate through a dust exhaust pipe.

[0011] Furthermore, the ash receiving assembly includes an ash receiving platform and an ash receiving box. The top surface of the mounting plate is fixedly connected to the ash receiving platform, and the top surface of the ash receiving platform is provided with a dovetail groove. An ash receiving box is installed below the filter plate, and the bottom surface of the ash receiving box is symmetrically fixedly connected with a dovetail block. The ash receiving box slides in the dovetail groove through the dovetail block.

[0012] The utility model provides a new energy vehicle gearbox gear blank forming platform. Compared with the prior art, it has the following beneficial effects:

[0013] 1. The lower die assembly cooperates with the upper die assembly to extrude the powder into the shape of a gear. Then, the lifting frame and the tooth ring are moved upward by lifting the salesman rod, so that the extruded gear is removed from the tooth ring, making it easier for the receiving assembly to push it away from above.

[0014] 2. The forward-pushing hydraulic rod in the receiving assembly drives the receiving plate and the baffle to move, thereby removing the L-shaped sealing plate under the storage hopper, making it easier to open the storage hopper, so that the powder material in the storage hopper falls into the receiving hole. At this time, the forward-pushing hydraulic rod is used to transport the powder material in the receiving hole to the gear ring, which is convenient for later extrusion;

[0015] 3. When the extruded gear moves on the filter plate, the excess dust will fall into the dust box below, which is convenient for the centralized recovery of material dust in the later stage;

[0016] 4. Through the cooperation of the dust suction pump, the annular cover, the dust inlet pipe and the dust exhaust pipe, the dust material splashed around during extrusion can be recovered and sucked into the storage hopper for reuse. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 The utility model overall structure schematic diagram is shown;

[0019] Figure 2Another structural diagram of the utility model is shown;

[0020] Figure 3 A schematic diagram of the disassembly structure of the ash receiving assembly of the utility model is shown;

[0021] Figure 4 A partial structural schematic diagram of the material storage assembly of the utility model is shown;

[0022] Figure 5 The schematic diagram of the structure of the upper mold assembly of the utility model is shown;

[0023] Figure 6 The schematic diagram of the structure of the material receiving assembly of the utility model is shown;

[0024] Figure 7 A partial structural schematic diagram of the material receiving assembly of the utility model is shown;

[0025] Figure 8 The schematic diagram of the structure of the lower mold assembly of the utility model is shown;

[0026] Fig. 9 A schematic diagram of the partial cross-sectional structure of the lower mold assembly of the utility model is shown;

[0027] As shown in the figure: 1. Mounting plate; 2. Lower mold assembly; 21. Lower mold table; 22. Mold slot; 23. Gear ring; 24. U-shaped frame; 25. Column; 26. Gear key column; 27. Lifting frame; 28. Gear ring; 29. ​​Column rod; 210. Lifting hydraulic rod; 3. Upper mold assembly; 31. Bending rod; 32. Pressing hydraulic rod; 33. Gear upper model; 4. Material receiving assembly; 41. Material receiving table; 42. T-slot; 43. T-block; 44. Baffle; 45. Auxiliary rod; 46. Push forward Hydraulic rod; 47, material receiving plate; 48, material receiving hole; 49, long rod; 410, reset damping rod; 5, material storage assembly; 51, material storage hopper; 52, sealing groove; 53, L-shaped sealing plate; 54, stretching damping rod; 55, dustproof plate; 56, dustproof net; 6, ash receiving assembly; 61, ash receiving platform; 62, ash receiving box; 63, dovetail groove; 64, dovetail block; 7, filter plate; 8, guide rod; 9, dust suction assembly; 91, dust suction pump; 92, dust inlet pipe; 93, ring cover; 94, dust exhaust pipe. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model is described clearly and completely. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Embodiment 1

[0029] In order to solve the technical problems in the background technology, a new energy vehicle gearbox gear blank forming station is provided as follows:

[0030] Combination Figure 1-Figure 9 As shown, the utility model provides a new energy vehicle gearbox gear blank forming station, including a mounting plate 1; a lower mold assembly 2 is mounted on the top surface of the mounting plate 1, an upper mold assembly 3 is mounted on the top surface of the mounting plate 1 and located above the lower mold assembly 2, a material receiving assembly 4 is mounted on the top surface of the mounting plate 1 and located on one side of the lower mold assembly 2, a material storage assembly 5 is mounted on the top surface of the mounting plate 1 and located above the material receiving assembly 4, an ash receiving assembly 6 is mounted on the top surface of the mounting plate 1 and located on the other side of the lower mold assembly 2, a filter plate 7 is fixedly connected to the other side of the lower mold assembly 2 and located above the ash receiving assembly 6, a guide rod 8 is fixedly connected to the other side of the lower mold assembly 2 and located above the filter plate 7, and a A dust suction component 9 is installed; the lower mold component 2 includes a lower mold table 21, the top surface of the mounting plate 1 is fixedly connected to the lower mold table 21, a mold groove 22 is provided in the middle of the top surface of the lower mold table 21, a gear ring 23 is installed in the mold groove 22, a U-shaped frame 24 is fixedly connected to the bottom surface of the lower mold table 21, a column 25 is fixedly connected to the middle of the top surface of the U-shaped frame 24, a tooth key column 26 is fixedly connected to the top surface of the column 25, a lifting frame 27 is slidably connected to the outer surface of the column 25, one end of the lifting frame 27 is fixedly connected to the tooth ring 28, a column rod 29 is fixedly connected to the bottom surface of the lower mold table 21, a lifting hydraulic rod 210 is fixedly connected to one side of the column rod 29, and one end of the lifting hydraulic rod 210 is fixedly connected to the lifting frame 27.

[0031] By lifting the hydraulic rod 210 to drive the gear pressure ring 28 to move upward, the formed gear can be removed from the gear ring 23, making it convenient for the receiving plate 47 in the later receiving component 4 to push it from above the gear ring 23 to above the filter plate 7, facilitating the later collection and subsequent processing.

[0032] In this embodiment, the upper mold assembly 3 includes a bending rod 31, the top surface of the mounting plate 1 is fixedly connected to the bending rod 31, one end of the bending rod 31 is fixedly connected to a downward pressing hydraulic rod 32, and one end of the downward pressing hydraulic rod 32 is fixedly connected to the gear upper model 33.

[0033] The upper mold assembly 3 cooperates with the lower mold assembly 2 to realize the extrusion of the dust material to form a gear, which is convenient for the subsequent calcination and molding. Embodiment 2

[0034] like Figure 1-Figure 9 As shown, based on the above embodiment, this embodiment further provides the following contents:

[0035] The material receiving assembly 4 includes a material receiving platform 41, the top surface of the mounting plate 1 is fixedly connected to the material receiving platform 41, the top surface of the material receiving platform 41 is provided with a T-slot 42, a T-block 43 is slidably connected in the T-slot 42, a baffle 44 is fixedly connected to the top surface of the T-block 43, one end of the material receiving platform 41 is fixedly connected to an auxiliary rod 45, one side of the auxiliary rod 45 is fixedly connected to a forward push hydraulic rod 46, the output end of the forward push hydraulic rod 46 is fixedly connected to a material receiving plate 47, the top surface of the material receiving plate 47 is provided with a material receiving hole 48, one end of one side of the baffle 44 is respectively fixedly connected to a long rod 49, one end of the long rod 49 passes through the material receiving plate 47 and is slidably connected to the material receiving plate 47, and a reset damping rod 410 is fixedly connected to one side of the baffle 44 and located between the material receiving plates 47.

[0036] When the receiving platform 41 and the baffle plate 44 in the receiving assembly 4 move to below the material storage hole 51, the material is taken out. When the receiving platform 41 and the baffle plate 44 move to above the lower mold assembly 2, the dust material taken out can be put into the lower mold assembly 2, and the last extruded gear can be pushed to the filter plate 7.

[0037] In this embodiment, the material storage component 5 includes a material storage hopper 51, and the material storage hopper 51 is fixed on the top surface of the mounting plate 1. A sealing groove 52 is provided at the discharge end of the material storage hopper 51, and an L-shaped sealing plate 53 is slidably connected in the sealing groove 52. The outer surface of the material storage hopper 51 and the two ends of the L-shaped sealing plate 53 are respectively fixedly connected with a tension damping rod 54, and one end of the tension damping rod 54 is connected to the L-shaped sealing plate 53. A dustproof plate 55 is installed on the top surface of the material storage hopper 51, and a dustproof net 56 is installed on the top surface of the dustproof plate 55.

[0038] When taking materials, the material receiving assembly 4 drives the L-shaped sealing plate 53 to move, thereby opening the material discharge port of the storage hopper 51. After opening, the dust material will fall into the material receiving hole 48, thereby achieving material taking. Embodiment 3

[0039] like Figure 1-Figure 9 As shown, based on the above embodiment, this embodiment further provides the following contents:

[0040] The dust suction assembly 9 includes a dust suction pump 91, and the top surface of the mounting plate 1 is fixedly connected to the dust suction pump 91. The input end of the dust suction pump 91 is connected to an annular cover 93 through a dust inlet pipe 92. The outer surface of the gear upper model 33 is fixedly connected to the annular cover 93. The output end of the dust suction pump 91 is connected to the inner cavity of the dust proof plate 55 through a dust exhaust pipe 94.

[0041] By means of the cooperation of the dust suction pump 91, the annular cover 93, the dust inlet pipe 92 and the dust exhaust pipe 94 in the dust suction assembly 9, the dust material splashed out from the gear ring 23 during extrusion can be recovered and reused.

[0042] In this embodiment, the ash receiving assembly 6 includes an ash receiving platform 61 and an ash receiving box 62. The top surface of the mounting plate 1 is fixedly connected to the ash receiving platform 61, and the top surface of the ash receiving platform 61 is provided with a dovetail groove 63. The ash receiving box 62 is installed below the filter plate 7, and the bottom surface of the ash receiving box 62 is symmetrically fixedly connected with a dovetail block 64. The ash receiving box 62 slides in the dovetail groove 63 through the dovetail block 64.

[0043] The dust of the materials remaining on the gear after molding can be recovered through the dust collecting box 62 in the dust collecting assembly 6, so as to facilitate centralized processing at a later stage.

[0044] The working principle and use process of this utility model:

[0045] In use:

[0046] When in use, first, push the hydraulic rod 46 forward, and the hydraulic rod 46 will drive the receiving plate 47 to move. When the receiving plate 47 moves, it will also drive the baffle plate 44 to move toward the storage hopper 51. When one side of the receiving plate 47 contacts one end of the L-shaped sealing plate 53, the L-shaped sealing plate 53 can be driven to move to one side and the damping rod 54 can be stretched. At this time, the discharge port of the storage hopper 51 can be opened. After opening, the material in the storage hopper 51 will fall into the receiving hole 48 on the receiving platform 41. Because the baffle plate 44 is located below the receiving plate 47 at this time, the material will be located on the receiving plate 47 and in the receiving hole 48. At this time, push the hydraulic rod 46 forward. The rod 46 will drive the receiving plate 47 and the baffle 44 to move toward the lower mold table 21. When one end of the baffle 44 moves to one side of the lower mold table 21, it will be blocked by one side of the lower mold table 21. At this time, the receiving plate 47 will be located above the receiving table 41 and move. At this time, the receiving plate 47 will move with the material to the top of the gear ring 23. At this time, the material in the receiving hole 48 falls into the gear ring 23. When the material fills the inner cavity of the gear ring 23, at this time, the forward hydraulic rod 46 will drive the receiving plate 47 to move toward the storage hopper 51 for secondary material collection. When collecting materials, at this time, the downward hydraulic rod 32 will drive the gear upper model 33 to move downward. When the gear upper model 3 3 moves downward, the annular cover 93 will be driven to move downward. When the upper mold 33 of the gear moves downward, the gear key column 26 and the gear pressure ring 28 will cooperate with each other. (However, during die casting, since the material in the gear ring 23 is too full, part of the material will splash out from the gear ring 23 during die casting. Therefore, during die casting, by starting the dust suction pump 91, the dust suction pump 91 cooperates with the annular cover 93, the dust exhaust pipe 94 and the dust inlet pipe 92 to suck the splashed material into the storage hopper 51, so that the material is reused.) When the gear is die-cast, the lifting hydraulic rod 210 is started. When the lifting hydraulic rod 210 works, it will drive the lifting frame 27 and the gear ring 28 to move upward. When the gear ring 28 moves upward, it will drive the formed gear to move upward, so that the gear moves to the lower mold table 21. At this time, the receiving plate 47 in the receiving assembly 4 will push the formed gear forward. When the gear is disengaged from the top of the gear ring 23, the lifting hydraulic rod 210 will drive the gear ring 28 to move downward. When the formed gear moves to the filter plate 7, it will slide downward under the action of the guide rod 8, which is convenient for subsequent processing. When the formed gear slides on the filter plate 7, it will also remove excess powder through the filter plate 7, and the powder will fall into the ash box 62, which is convenient for removing the ash box 62 from the ash receiving table 61 later, so as to facilitate unified processing later.

[0047] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0048] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A new energy vehicle gearbox gear blank forming station, characterized in that: It comprises a mounting plate; a lower mold assembly is mounted on the top surface of the mounting plate, an upper mold assembly is mounted on the top surface of the mounting plate and located above the lower mold assembly, a material receiving assembly is mounted on the top surface of the mounting plate and located on one side of the lower mold assembly, a material storing assembly is mounted on the top surface of the mounting plate and located above the material receiving assembly, an ash receiving assembly is mounted on the top surface of the mounting plate and located on the other side of the lower mold assembly, a filter plate is fixedly connected to the other side of the lower mold assembly and located above the ash receiving assembly, a guide rod is fixedly connected to the other side of the lower mold assembly and located above the filter plate, and a dust collecting assembly is mounted on the top surface of the mounting plate; The lower mold assembly includes a lower mold table, the top surface of the mounting plate is fixedly connected to the lower mold table, a mold groove is provided in the middle of the top surface of the lower mold table, a gear ring is installed in the mold groove, the bottom surface of the lower mold table is fixedly connected to a U-shaped frame, the middle of the top surface of the U-shaped frame is fixedly connected to a column, the top surface of the column is fixedly connected to a gear key column, the outer surface of the column is slidably connected to a lifting frame, one end of the lifting frame is fixedly connected to a gear ring, the bottom surface of the lower mold table is fixedly connected to a column rod, one side of the column rod is fixedly connected to a lifting hydraulic rod, and one end of the lifting hydraulic rod is fixedly connected to the lifting frame.

2. A new energy vehicle gearbox gear blank forming station according to claim 1, characterized in that: The upper mold assembly includes a bent rod, the top surface of the mounting plate is fixedly connected to the bent rod, one end of the bent rod is fixedly connected to a downward pressure hydraulic rod, and one end of the downward pressure hydraulic rod is fixedly connected to the gear upper model.

3. A new energy vehicle gearbox gear blank forming station according to claim 2, characterized in that: The material receiving assembly includes a material receiving platform, the top surface of the mounting plate is fixedly connected to the material receiving platform, the top surface of the material receiving platform is provided with a T-slot, a T-block is slidably connected in the T-slot, the top surface of the T-block is fixedly connected to a baffle, one end of the material receiving platform is fixedly connected to an auxiliary rod, one side of the auxiliary rod is fixedly connected to a forward hydraulic rod, the output end of the forward hydraulic rod is fixedly connected to a material receiving plate, the top surface of the material receiving plate is provided with a material receiving hole, the two ends of one side of the baffle are respectively fixedly connected to long rods, one end of the long rod passes through the material receiving plate and is slidably connected to the material receiving plate, and a reset damping rod is fixedly connected to one side of the baffle and located between the material receiving plates.

4. The new energy vehicle gearbox gear blank forming station according to claim 3 is characterized in that: The material storage assembly includes a material storage hopper, the material storage hopper is fixed on the top surface of the mounting plate, a sealing groove is provided at the discharge end of the material storage hopper, an L-shaped sealing plate is slidably connected in the sealing groove, a stretch damping rod is fixedly connected to the outer surface of the material storage hopper and at both ends of the L-shaped sealing plate, one end of the stretch damping rod is connected to the L-shaped sealing plate, a dustproof plate is installed on the top surface of the material storage hopper, and a dustproof net is installed on the top surface of the dustproof plate.

5. The new energy vehicle gearbox gear blank forming station according to claim 4 is characterized in that: The dust suction assembly includes a dust suction pump, the top surface of the mounting plate is fixedly connected to the dust suction pump, the input end of the dust suction pump is connected to an annular cover through a dust inlet pipe, the outer surface of the gear upper model is fixedly connected to an annular cover, and the output end of the dust suction pump is connected to the inner cavity of the dust proof plate through a dust exhaust pipe.

6. The new energy vehicle gearbox gear blank forming station according to claim 5 is characterized in that: The ash receiving assembly includes an ash receiving platform and an ash receiving box. The top surface of the mounting plate is fixedly connected to the ash receiving platform, and a dovetail groove is provided on the top surface of the ash receiving platform. An ash receiving box is installed below the filter plate, and a dovetail block is symmetrically fixedly connected to the bottom surface of the ash receiving box. The ash receiving box slides in the dovetail groove through the dovetail block.

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