A molding device for precast concrete inspection wells

Abstract

This invention discloses a molding device for precast concrete manholes, relating to the field of manhole production technology. The device includes a main body, a driving mechanism located within a hole-forming mechanism, a hole diameter adjustment mechanism located to one side of the driving mechanism, and a transmission mechanism located above the main body. The main body includes an inner mold, an outer mold surrounding the inner mold, and a moving wheel positioned below the outer mold and below a connecting frame. The outer mold consists of two parts. During manhole casting, this molding device eliminates the need for an additional connecting hole mold. After casting, when the outer mold is opened, the hole-forming mechanism moves with it, shrinking in size and automatically removing itself from the manhole. This eliminates the need for subsequent manual removal of the connecting hole mold. Furthermore, the diameter of the hole-forming mechanism can be manually adjusted as needed, facilitating the production of manholes with connecting holes of different diameters.

Description

Technical Field

[0001] This invention relates to the field of inspection well manufacturing technology, and in particular to a molding device for precast concrete inspection wells. Background Technology

[0002] Inspection wells are installed to facilitate the maintenance and installation of underground infrastructure such as power supply, water supply, drainage, communications, heating pipes, gas pipes, and street light lines in cities. They are generally located at pipe junctions, bends, changes in pipe diameter or slope, and at regular intervals along straight pipe sections to facilitate periodic inspections of ancillary structures. They are commonly used in residential areas, public building areas, factory areas, urban and rural municipal projects, industrial parks, and urban renewal projects. Inspection wells are mainly constructed using methods such as manual masonry, plastic molds, and precast concrete.

[0003] Chinese invention patent CN112123548A discloses a molding device for precast concrete manholes, including a hanger assembly, a molding seat, a cover plate, a tilting assembly, and an electric heater. The hanger assembly includes a horizontal hanging plate and a support plate. The molding seat is rotatably connected to the support plate and has a molding cavity inside. The cover plate is hinged to the top of the molding seat and has a pouring port on the top of the cover plate. The beneficial effects achieved by the above invention are: by using an electric heater to heat the molding seat, the molding efficiency of the precast concrete manhole after molding is improved, thereby facilitating the demolding operation of the precast concrete manhole; the tilting assembly drives the cover plate to tilt, opening the opening of the molding cavity of the molding seat, thereby further facilitating demolding by workers; and the inclusion of an air storage cavity and vent holes allows gas in the molding cavity to enter the air storage cavity through the vent holes during molding, reducing gas retention in the molding cavity and facilitating the molding process.

[0004] However, the existing device still has some problems in use. In order to facilitate the connection between the manhole and the pipeline, a connection hole is often made. The above-mentioned device is cast in place, which means that a hole-forming mold for the connection hole needs to be placed in the forming device when making the connection hole. After the manhole is cast, the hole-forming mold is located in the manhole. It needs to be removed manually later so that the connection hole can be used normally. However, the hole-forming mold is often scrapped when it is disassembled and cannot be recycled, thus increasing the cost of use. Summary of the Invention

[0005] The present invention addresses the problem that existing technical solutions are too simplistic and provides a solution that is significantly different from existing technologies. The present invention provides a molding device for precast concrete inspection wells to solve the technical problem that existing hole-forming molds cannot be reused, which increases the production cost of inspection wells.

[0006] The present invention adopts the following technical solution: a molding device for precast concrete inspection wells, including a body, a hole-forming mechanism for forming connecting holes, a driving mechanism for adjusting the hole-forming mechanism, a hole diameter adjustment mechanism for controlling the movement of the driving mechanism, and a transmission mechanism for driving the movement of the hole diameter adjustment mechanism. The hole-forming mechanism is located inside the body, the driving mechanism is located inside the hole-forming mechanism, the hole diameter adjustment mechanism is located on one side of the driving mechanism, and the transmission mechanism is located above the body. The body includes an inner mold, an outer mold is provided outside the inner mold, and a gap is provided between the inner mold and the outer mold. A moving wheel is provided below the outer mold, and the moving wheel is located below the connecting frame. The outer mold consists of two parts.

[0007] Furthermore, the hole-forming mechanism includes a hole-forming mold cavity located inside the outer mold. A connecting plate is provided inside the hole-forming mold cavity, and several support blocks are provided inside the hole-forming mold cavity, with the support blocks being staggered. A third connecting rack is provided inside the support block, and a connecting gear is provided inside the third connecting rack. A connecting rod is connected to the connecting gear, and the connecting rod is connected to the connecting plate. A toothed ring is provided inside the connecting gear.

[0008] Furthermore, the third connecting rack is meshed with the connecting gear, the connecting gear is meshed with the toothed ring, and both the inner and outer rings of the toothed ring are provided with convex teeth, and the third connecting rack and the toothed ring are staggered.

[0009] Furthermore, the forming mold cavity is made of high-temperature resistant rubber, the connection between the connecting plate and the connecting rod is made of hard plastic, and the outer ring of the connecting plate is made of high-temperature resistant rubber.

[0010] Furthermore, the driving mechanism includes a third driving gear, which is disposed on the inner ring of the gear ring and meshes with the gear ring. A connecting post is connected to the end of the connecting gear, and the connecting post passes through the outer mold. A first driving gear is disposed at the end of the connecting post, and a second driving gear is disposed inside the first driving gear. At least one ratchet groove is opened in the second driving gear, and a pawl is disposed in the ratchet groove. A return spring is disposed between the pawl and the connecting post. Both the first driving gear and the second driving gear are located outside the outer mold.

[0011] Furthermore, the aperture adjustment mechanism includes a first connecting rack located on one side of the second drive gear. A connecting strip is provided on one side of the first connecting rack. A plurality of mounting grooves are provided in the connecting strip. Mounting blocks are provided in the mounting grooves. A connecting tooth block is provided at the end of the mounting block. The connecting tooth block is located outside the connecting strip.

[0012] Furthermore, the mounting block and the mounting groove have a T-shaped cross-section, the first connecting rack is meshed with the second drive gear, the connecting tooth block is meshed with the first drive gear, and the spacing between the connecting tooth blocks is the same as the spacing between the tooth blocks on the first connecting rack.

[0013] Furthermore, the transmission mechanism includes a mounting frame, which is disposed on the outside of the outer mold. A transmission gear is rotatably connected to the end of the mounting frame. A mating rack is disposed below the transmission gear and is disposed on the connecting frame. A second connecting rack is disposed on the outside of the transmission gear and is located below the connecting strip.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] Firstly, through the coordinated action of the drilling mechanism and the driving mechanism, the connection holes of the inspection well are formed, while the drilling mold cavity in the drilling mechanism is easily removed from the connection holes. During use, because the drilling mechanism is connected to the outer mold, the drilling mold cavity in the drilling mechanism ensures the formation of the connection holes of the inspection well during casting. When the outer mold is opened, the drilling mold cavity moves synchronously with the outer mold, thus removing the drilling mold cavity from the inspection well. This eliminates the need for manual mold removal later, effectively preventing problems caused during mold removal. When the mold is damaged, the diameter of the forming mold cavity will shrink when it is removed from the inspection well. The shrunken forming mold cavity can be removed from the inspection well more easily. At the same time, the removal is carried out by the moving force of the outer mold, without the need for an additional power source, thus reducing kinetic energy loss. In addition, the forming mold cavity works synchronously with the outer mold. When the outer mold tends to open, the forming mold cavity will shrink, avoiding friction between the mold cavity and the inspection well, which would cause wear to the forming mold cavity and effectively extend the service life of the forming mold cavity.

[0016] Secondly, the outer diameter of the forming mold cavity can be adjusted through the aperture adjustment mechanism, which facilitates the formation of connecting holes of different diameters in the inspection well. When in use, the appropriate number of connecting tooth blocks can be installed according to the required aperture size of the connecting hole. When the outer mold is closed, the aperture adjustment mechanism moves upward through the transmission mechanism. At this time, the connecting tooth blocks mesh with the first drive gear, which drives the third drive gear to rotate, thereby driving the support block to move outward, thus achieving the function of adjusting the outer diameter of the forming mold cavity. In use, the movement trajectory of the outer mold may be greater than the movement trajectory of the support block. However, since the connecting tooth blocks are selectively installed, when the support block moves to the appropriate position, the connecting tooth blocks and the second drive gear have disengaged. At the same time, the first drive gear and the connecting column are used with a pawl and ratchet groove. At this time, the upward movement of the first connecting rack will not drive the first drive gear to continue to move, thereby achieving the function of controlling the movement position of the support block. In addition, the forming mold cavity is equipped with support blocks. When cement is poured, the forming mold cavity will not deform under the gravity of the cement, ensuring the forming effect of the connecting hole.

[0017] Thirdly, in summary, when the forming device is used for casting manholes, there is no need to place additional connecting hole molds through the hole forming mechanism. After the manhole is cast, when the outer mold is opened, the hole forming mechanism will move with the outer mold and shrink, so that the hole forming mechanism will automatically move out of the manhole. There is no need to manually remove the connecting hole mold later. Moreover, the diameter of the hole forming mechanism can be manually adjusted according to the needs, which facilitates the production of manholes with connecting holes of different diameters. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the main cross-section of the present invention;

[0021] Figure 3 This is a cross-sectional view of the hole-forming mechanism of the present invention;

[0022] Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the middle;

[0023] Figure 5For the present invention Figure 3 Enlarged structural diagram at point B;

[0024] Figure 6 This is an exploded view of the drive mechanism of the present invention;

[0025] Figure 7 This is a schematic diagram of the hole-forming mechanism of the present invention.

[0026] Figure label:

[0027] 1. Body; 11. Inner mold; 12. Outer mold; 13. Moving wheel; 14. Connecting frame; 2. Hole diameter adjustment mechanism; 21. First connecting rack; 22. Connecting tooth block; 23. Mounting block; 24. Mounting groove; 25. Connecting strip; 3. Transmission mechanism; 31. Mounting frame; 32. Transmission gear; 33. Mating rack; 34. Second connecting rack; 4. Hole forming mechanism; 41. Connecting plate; 42. Hole forming mold cavity; 43. Support block; 44. Third connecting rack; 45. Connecting gear; 46. Connecting rod; 47. Gear ring; 5. Drive mechanism; 51. First drive gear; 52. Connecting column; 53. Second drive gear; 54. Return spring; 55. Third drive gear; 56. Ratchet groove; 57. Pawl. Detailed Implementation

[0028] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0029] The components of the embodiments of the invention described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0030] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] The following is combined with Figures 1 to 7 As shown, this embodiment of the invention provides a molding device for precast concrete inspection wells, including a body 1, a hole-forming mechanism 4 for forming connecting holes, a drive mechanism 5 for adjusting the hole-forming mechanism 4, a hole diameter adjustment mechanism 2 for controlling the movement of the drive mechanism 5, and a transmission mechanism 3 for driving the movement of the hole diameter adjustment mechanism 2. The hole-forming mechanism 4 is located inside the body 1, the drive mechanism 5 is located inside the hole-forming mechanism 4, the hole diameter adjustment mechanism 2 is located on one side of the drive mechanism 5, and the transmission mechanism 3 is located above the body 1. The body 1 includes an inner mold 11, an outer mold 12 is provided outside the inner mold 11, and a gap is provided between the inner mold 11 and the outer mold 12. A moving wheel 13 is provided below the outer mold 12, and the moving wheel 13 is located below the connecting frame 14. The outer mold 12 is composed of two parts.

[0034] During operation, when the forming device is casting the inspection well, there is no need to place an additional connecting hole mold through the hole forming mechanism 4. After the inspection well is cast, when the outer mold 12 is opened, the hole forming mechanism 4 will move with the outer mold 12 and shrink, so that the hole forming mechanism 4 will automatically move out of the inspection well. There is no need to manually remove the connecting hole mold later. Moreover, the diameter of the hole forming mechanism 4 can be manually adjusted according to the needs, so as to facilitate the production of inspection wells with connecting holes of different diameters.

[0035] Specifically, the hole-forming mechanism 4 includes a hole-forming mold cavity 42 located inside the outer mold 12. A connecting plate 41 is provided inside the hole-forming mold cavity 42. Several support blocks 43 are provided inside the hole-forming mold cavity 42, and the support blocks 43 are staggered. A third connecting rack 44 is provided inside the support block 43. A connecting gear 45 is provided inside the third connecting rack 44. A connecting rod 46 is connected to the connecting gear 45. The connecting rod 46 is connected to the connecting plate 41. A toothed ring 47 is provided inside the connecting gear 45.

[0036] During operation, the drilling mechanism 4 can be used to drill holes in the inspection well, thus eliminating the need for additional drilling molds.

[0037] Specifically, the third connecting rack 44 is meshed with the connecting gear 45, the connecting gear 45 is meshed with the toothed ring 47, and both the inner and outer rings of the toothed ring 47 are provided with protruding teeth. The third connecting rack 44 and the toothed ring 47 are staggered.

[0038] Specifically, the forming mold cavity 42 is made of high-temperature resistant rubber, the connection between the connecting plate 41 and the connecting rod 46 is made of hard plastic, and the outer ring of the connecting plate 41 is made of high-temperature resistant rubber.

[0039] During operation, the diameter of the forming mold cavity 42 can be adjusted by the movement of the support block 43, thereby adjusting the diameter of the connecting hole. Furthermore, since the inner ring of the connecting plate 41 is made of hard plastic, it facilitates the connection of the connecting rod 46.

[0040] Specifically, the driving mechanism 5 includes a third driving gear 55, which is disposed on the inner ring of the gear ring 47 and meshes with the gear ring 47. The end of the connecting gear 45 is connected to a connecting post 52, which passes through the outer mold 12. The end of the connecting post 52 is provided with a first driving gear 51, and the inner side of the first driving gear 51 is provided with a second driving gear 53. At least one ratchet groove 56 is opened in the second driving gear 53, and a pawl 57 is provided in the ratchet groove 56. A return spring 54 is provided between the pawl 57 and the connecting post 52. The first driving gear 51 and the second driving gear 53 are both located outside the outer mold 12.

[0041] During operation, the working mechanism 4 and the driving mechanism 5 work together to ensure the forming of the connection hole for the inspection well, while facilitating the removal of the forming mold cavity 42 from the connection hole. In use, because the forming mechanism 4 is connected to the outer mold 12, the forming mold cavity 42 ensures the forming of the connection hole for the inspection well during casting. When the outer mold 12 is opened, the forming mold cavity 42 moves synchronously with it, allowing it to be removed from the inspection well. This eliminates the need for manual mold removal later, effectively preventing problems during mold removal. When the mold is damaged, the diameter of the forming mold cavity 42 will shrink when it is removed from the inspection well. The shrunken forming mold cavity 42 can be removed from the inspection well more easily. At the same time, the removal is carried out by the moving force of the outer mold 12, without the need for an additional power source, thus reducing energy loss. In addition, the forming mold cavity 42 works synchronously with the outer mold 12. When the outer mold 12 tends to open, the forming mold cavity 42 will shrink, avoiding friction between the mold cavity and the inspection well, which would cause wear to the forming mold cavity 42 and effectively extend the service life of the forming mold cavity 42.

[0042] Specifically, the aperture adjustment mechanism 2 includes a first connecting rack 21, which is located on one side of the second drive gear 53. A connecting strip 25 is provided on one side of the first connecting rack 21. A plurality of mounting grooves 24 are provided in the connecting strip 25. Mounting blocks 23 are provided in the mounting grooves 24. A connecting tooth block 22 is provided at the end of the mounting block 23. The connecting tooth block 22 is located outside the connecting strip 25.

[0043] Specifically, the mounting block 23 and the mounting groove 24 have a T-shaped cross-section. The first connecting rack 21 is meshed with the second drive gear 53. The connecting tooth block 22 is meshed with the first drive gear 51. The spacing of the connecting tooth block 22 is the same as the spacing of the tooth blocks on the first connecting rack 21.

[0044] During operation, the mounting block 23 and the mounting slot 24 are plug-in connected, which facilitates the installation of the mounting block 23 and the mounting slot 24. At the same time, by changing the number of mounting blocks 23, the rotation speed of the third drive gear 55 can be controlled.

[0045] Specifically, the transmission mechanism 3 includes a mounting frame 31, which is disposed on the outside of the outer mold 12. A transmission gear 32 is rotatably connected to the end of the mounting frame 31. A mating rack 33 is disposed below the transmission gear 32 and is disposed on the connecting frame 14. A second connecting rack 34 is disposed on the outside of the transmission gear 32 and is located below the connecting bar 25.

[0046] During operation, the movement of the outer mold 12 drives the rest of the structure to work without the need for additional power.

[0047] Working principle: During use, install an appropriate number of connecting tooth blocks 22 according to the required hole diameter of the inspection well connection hole. During installation, the connecting tooth blocks 22 are installed sequentially from top to bottom in the installation groove 24 through the end mounting blocks 23. After installation, casting can be carried out. During casting, the two outer molds 12 are first driven to move. When the outer molds 12 move, since the outer molds 12 are connected to the transmission gears 32 through the connecting plate 41, the transmission gears 32 will move synchronously with the outer molds 12. However, since the transmission gears 32 mesh with the mating racks 33, when the transmission gears 32 move, they will be gripped by the mating racks 33. At the same time, since the transmission gears 32 and the second connecting racks... The engagement of gears 34 and 32 causes the second connecting rack 34 to move upward under the influence of the transmission gear 32. As the second connecting rack 34 moves upward, the first connecting rack 21 and the first connecting rack 25 move upward synchronously due to their connection with the second connecting rack 34. Since the connecting rack 25 is equipped with connecting tooth blocks 22, its upward movement drives the first drive gear 51 to rotate via the connecting rack. The rotation of the first drive gear 51 drives the third drive gear 55 to rotate via the connecting column 52. Because the third drive gear 55 meshes with the gear ring 47, the gear ring 47 will rotate along with the third drive gear 55. Simultaneously, the connecting gear 45 meshes with the gear ring 47, and the connecting gear... 45 meshes with the third connecting rack 44, causing the gear ring 47 to rotate and drive the third connecting rack 44 to move. Since the third connecting rack 44 is connected to the support block 43, and the support block 43 is connected to the forming mold cavity 42, the forming mold cavity 42 can be adjusted. When the moving bar moves to a certain position, the connecting gear block 22 disengages from the first driving gear 51. However, at the same time, the second driving gear 53 remains engaged with the first connecting rack 21. The second driving gear 53 is connected to the connecting post 52 via the ratchet groove 56 and the pawl 57, making the second driving gear 53 a one-way gear. This prevents the upward movement of the first connecting rack 21 from driving the third driving gear 55 to rotate. To ensure that the outer mold 12 can be closed normally, casting can be carried out after the mold is closed. When the mold needs to be removed after casting, the outer mold 12 is opened. When the outer mold 12 is opened, the transmission gear 32 reverses, causing the first connecting rack 21 to move downward. After the first connecting rack 21 moves downward, it will drive the third driving gear 55 to rotate through the second driving gear 53, thereby driving the gear ring 47 to reverse. The reverse rotation of the gear ring 47 will drive the support block 43 to retract, thereby reducing the size of the forming mold cavity 42. The reduced forming mold cavity 42 is easier to remove from the formed inspection well, avoiding friction between the forming mold cavity 42 and the inspection well when the forming mold cavity 42 moves with the outer mold 12, which will cause wear and effectively extend the service life of the forming mold cavity 42.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention 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; and 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 the present invention.

Claims

1. A molding device for precast concrete inspection wells, comprising a body (1), characterized in that; It also includes a hole-forming mechanism (4) for forming connecting holes, a drive mechanism (5) for adjusting the hole-forming mechanism (4), a hole diameter adjustment mechanism (2) for controlling the movement of the drive mechanism (5), and a transmission mechanism (3) for driving the movement of the hole diameter adjustment mechanism (2). The hole-forming mechanism (4) is located inside the body (1), the drive mechanism (5) is located inside the hole-forming mechanism (4), the hole diameter adjustment mechanism (2) is located on one side of the drive mechanism (5), and the transmission mechanism (3) is located above the body (1). The body (1) includes an inner mold (11), an outer mold (12) is provided outside the inner mold (11), and a gap is provided between the inner mold (11) and the outer mold (12). A moving wheel (13) is provided below the outer mold (12), and the moving wheel (13) is provided below the connecting frame (14). The outer mold (12) consists of two parts.

2. The molding device for precast concrete inspection wells according to claim 1, characterized in that; The hole forming mechanism (4) includes a hole forming mold cavity (42), which is located inside the outer mold (12). A connecting plate (41) is provided inside the hole forming mold cavity (42). Several support blocks (43) are provided inside the hole forming mold cavity (42), and the support blocks (43) are staggered. A third connecting rack (44) is provided inside the support block (43). A connecting gear (45) is provided inside the third connecting rack (44). A connecting rod (46) is connected in the connecting gear (45). The connecting rod (46) is connected to the connecting plate (41). A toothed ring (47) is provided inside the connecting gear (45).

3. A molding device for precast concrete inspection wells according to claim 2, characterized in that; The third connecting rack (44) is meshed with the connecting gear (45), the connecting gear (45) is meshed with the toothed ring (47), and both the inner and outer rings of the toothed ring (47) are provided with protruding teeth. The third connecting rack (44) and the toothed ring (47) are misaligned.

4. A molding device for precast concrete inspection wells according to claim 2, characterized in that; The forming mold cavity (42) is made of high temperature resistant rubber, the connection between the connecting plate (41) and the connecting rod (46) is made of hard plastic, and the outer ring of the connecting plate (41) is made of high temperature resistant rubber.

5. A molding device for precast concrete inspection wells according to claim 2, characterized in that, The driving mechanism (5) includes a third driving gear (55), which is located on the inner ring of the gear ring (47) and meshes with the gear ring (47). The end of the connecting gear (45) is connected to a connecting post (52), which passes through the outer mold (12). The end of the connecting post (52) is provided with a first driving gear (51), and the inner side of the first driving gear (51) is provided with a second driving gear (53). At least one ratchet groove (56) is provided in the second driving gear (53), and a pawl (57) is provided in the ratchet groove (56). A return spring (54) is provided between the pawl (57) and the connecting post (52). The first driving gear (51) and the second driving gear (53) are both located outside the outer mold (12).

6. A molding device for precast concrete inspection wells according to claim 5, characterized in that; The aperture adjustment mechanism (2) includes a first connecting rack (21), which is located on one side of the second drive gear (53). A connecting strip (25) is provided on one side of the first connecting rack (21). A plurality of mounting grooves (24) are provided in the connecting strip (25). A mounting block (23) is provided in the mounting groove (24). A connecting tooth block (22) is provided at the end of the mounting block (23). The connecting tooth block (22) is located outside the connecting strip (25).

7. A molding device for precast concrete inspection wells according to claim 6, characterized in that; The mounting block (23) and the mounting groove (24) have a T-shaped cross section. The first connecting rack (21) is meshed with the second drive gear (53). The connecting tooth block (22) is meshed with the first drive gear (51). The spacing of the connecting tooth block (22) is the same as the spacing of the tooth blocks on the first connecting rack (21).

8. A molding device for precast concrete inspection wells according to claim 6, characterized in that; The transmission mechanism (3) includes a mounting frame (31), which is located on the outside of the outer mold (12). A transmission gear (32) is rotatably connected to the end of the mounting frame (31). A mating rack (33) is provided below the transmission gear (32), and the mating rack (33) is located on the connecting frame (14). A second connecting rack (34) is provided on the outside of the transmission gear (32), and the second connecting rack (34) is located below the connecting bar (25).

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