Adjustable powder spreading device for 3DP sand mold printer

Abstract

The utility model discloses an adjustable powder spreading device for a 3DP sand mold printer, and relates to the field of sand spreading of sand mold printing, the adjustable powder spreading device comprises two end plates, transmission rollers are rotatably installed at the two ends between the two end plates, a conveying belt is in transmission connection between the two transmission rollers, first connecting supports are welded to the top ends of the two end plates, and second connecting supports are welded to the top ends of the two end plates. A sand hopper is fixedly connected between the two sets of first connecting supports, second connecting supports are welded to the top ends of the end plates and the outer wall of the sand hopper, a fixed scraper is fixedly installed at the ends, away from the sand hopper, of the second connecting supports, and sleeve plates are fixedly installed on the outer sides of the two end plates through connecting frames. And an adjustable scraper mechanism is mounted on the sleeve plate. Through the arrangement of the sensing mechanism and the adjustable scraper mechanism, the distance can be effectively prevented from being automatically adjusted when errors occur on the liftable printing platform, so that the problem that a laid sand layer is scratched by a linearly moving device is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the sand type printing's sand field, concretely is a kind of adjustable powder laying device for 3DP sand type printer. BACKGROUND

[0002] Sand type printing is through the sand layer mixed with curing agent is laid, and resin is sprayed on the surface of sand layer, and part section is formed, so sand core can be formed by layer by layer laying.

[0003] In prior art, sand layer laying is realized by powder laying device, powder laying device generally has two scrapers, first scraper is used to flatten sand layer on conveying belt, and second scraper is used to flatten sand layer falling on printing platform, when device runs, after every laying on moving platform, it is moved downwards by certain distance, occasionally, moving platform does not move downwards, at this time, linearly moving powder laying device can cause scratch to sand layer that has been laid, leading to sand layer damage. UTILITY MODEL CONTENT

[0004] The utility model aims at: in order to solve the problem in the background art, provide a kind of adjustable powder laying device for 3DP sand type printer.

[0005] To achieve the above object, the utility model provides the following technical scheme: a kind of adjustable powder laying device for 3DP sand type printer, including two end plates, two end plates are rotatably installed with transmission roller between both ends, transmission roller is drivingly connected with conveying belt between two, the top of two end plates is welded with a No. connection support, two groups of No. connection support are fixedly connected with sand hopper between, the top of end plate and the outer wall of sand hopper are welded with No. connection support, the end of No. connection support away from sand hopper is fixedly installed with fixed scraper, the outer side of two end plates is fixedly installed with sleeve plate by connecting frame, the sleeve plate is installed with adjustable scraper mechanism, the outer side of sleeve plate and adjustable scraper mechanism are distributed and installed with sensing mechanism.

[0006] As the further scheme of the utility model: the adjustable scraper mechanism includes adjustable scraper that is slidably connected in the inner chamber of sleeve plate, the bottom of adjustable scraper is penetrated to the lower of sleeve plate, the top of sleeve plate is installed with electric push cylinder, the output of electric push cylinder is penetrated to the inner chamber of sleeve plate, and the output of electric push cylinder is fixedly connected with the top of adjustable scraper, spring is abutted between the top of adjustable scraper and the bottom of the inner wall of sleeve plate, the spring is sleeved on the outer wall of electric push cylinder output shaft.

[0007] As a further scheme of the utility model: the sensing mechanism includes an infrared distance sensor and an infrared receiver symmetrically arranged with the infrared distance sensor, the infrared receiver is fixedly installed at the top end of the sleeve plate, an infrared emitter is fixedly installed at the top end of the adjustable scraper, the infrared emitter penetrates to the outside of the sleeve plate, the infrared receiver and the infrared emitter are aligned in the up-down direction, a sliding groove for the up-down movement of the infrared emitter is arranged in the inside of the sleeve plate.

[0008] As a further scheme of the utility model: one end of the end plate is provided with a rotary motor, a speed reducer is installed at the output end of the rotary motor, the output end of the speed reducer penetrates the end plate and is fixedly connected with one end of the transmission roller.

[0009] As a further scheme of the utility model: the rear baffle is fixedly installed above the conveying belt between the two end plates.

[0010] Compared with the prior art, the utility model has the advantages that:

[0011] 1. By setting the sensing mechanism and the adjustable scraper mechanism, the spacing can be automatically adjusted when the error occurs in the liftable printing platform, thereby avoiding the problem that the linear moving device scratches the laid sand layer. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a structural schematic view of the utility model;

[0013] Figure 2 It is a conveying belt installation schematic view of the utility model;

[0014] Figure 3 It is a sensing mechanism installation schematic view of the utility model;

[0015] Figure 4 It is a structural schematic view of the adjustable scraper mechanism of the utility model.

[0016] In the drawing: 1, end plate; 2, rotary motor; 3, speed reducer; 4, No. 1 connecting support; 5, sand hopper; 6, conveying belt; 7, No. 2 connecting support; 8, fixed scraper; 9, sleeve plate; 10, adjustable scraper; 11, sliding groove; 12, electric push cylinder; 13, infrared distance sensor; 14, infrared receiver; 15, infrared emitter; 16, transmission roller; 17, rear baffle; 18, spring. DETAILED DESCRIPTION

[0017] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0018] Please refer to Figures 1-4 In the embodiments of the present application, the adjustable powder laying device for 3DP sand mold printer comprises two end plates 1, a transmission roller 16 rotatably installed at each end between the two end plates 1, a conveying belt 6 transmissionally connected between the two transmission rollers 16, a No. 1 connecting bracket 4 welded at the top end of each of the two end plates 1, a sand hopper 5 fixedly connected between the two groups of No. 1 connecting brackets 4, a No. 2 connecting bracket 7 welded at the top end of the end plate 1 and the outer wall of the sand hopper 5, a fixed scraper 8 fixedly installed at the end of the No. 2 connecting bracket 7 away from the sand hopper 5, a sleeve plate 9 fixedly installed at the outer side of each of the two end plates 1 through a connecting frame, an adjustable scraper mechanism installed on the sleeve plate 9, a sensing mechanism distributedly installed on the outer side of the sleeve plate 9 and the adjustable scraper mechanism, a rotary motor 2 installed at one end of one of the end plates 1, a speed reducer 3 installed at the output end of the rotary motor 2, and the output end of the speed reducer 3 penetrating through the end plate 1 and fixedly connected with the center of one end of one of the transmission rollers 16.

[0019] In the present embodiment: first, when laying sand, the rotary motor 2 is started, the rotary motor 2 transmits torque to the speed reducer 3, the speed reducer transmits torque to the transmission roller 16 connected thereto, the transmission roller 16 rotates to drive the other transmission roller 16 to rotate synchronously through the conveying belt 6, at this time, the top end of the conveying belt 6 drives the direction of the fixed scraper 8, since the distance between the output port of the sand hopper 5 and the top end of the conveying belt 6 is 0.3 mm, therefore, during the transmission of the conveying belt 6, the sand will be carried outward, when the sand passes through the bottom end of the fixed scraper 8, since the distance between the fixed scraper 8 and the top end of the conveying belt 6 is 0.3 mm, at this time, the fixed scraper 8 will flatten the moving sand layer once;

[0020] After the sand separates from the conveying belt 6, it falls onto the printing platform, at this time, the whole device moves linearly under the driving of the driving device, the linear movement direction is toward the direction of the sand hopper 5, at this time, the adjustable scraper 10 moves again to flatten the sand layer falling on the printing platform, avoiding the phenomenon that the sand layer falls unevenly on the printing platform.

[0021] Please refer to Figure 1 , Figure 3 and Figure 4The adjusting type scraper mechanism comprises an adjusting scraper 10 slidably connected to the inner cavity of the sleeve plate 9, the bottom end of the adjusting scraper 10 penetrates to the lower side of the sleeve plate 9, the top end of the sleeve plate 9 is provided with an electric push cylinder 12, the output end of the electric push cylinder 12 penetrates to the inner cavity of the sleeve plate 9, and the output end of the electric push cylinder 12 is fixedly connected to the top end of the adjusting scraper 10, the top end of the adjusting scraper 10 abuts against the bottom end of the inner wall of the sleeve plate 9, the spring 18 is sleeved on the outer wall of the output shaft of the electric push cylinder 12, the sensing mechanism comprises an infrared distance sensor 13 and an infrared receiver 14 symmetrically arranged with the infrared distance sensor 13, the infrared receiver 14 is fixedly installed on the top end of the sleeve plate 9, the top end of the adjusting scraper 10 is fixedly provided with an infrared emitter 15, the infrared emitter 15 penetrates to the outside of the sleeve plate 9, the infrared receiver 14 and the infrared emitter 15 are aligned in the up-down direction, and the inner part of the sleeve plate 9 is provided with a sliding groove 11 for the up-down movement of the infrared emitter 15.

[0022] In the embodiment, first, the infrared distance sensor 13 measures the distance between the output end and the topmost sand layer before the device performs linear movement, the distance should meet the total height of the sleeve plate 9 and the adjusting scraper 10 + 0.3 mm, when the actual distance does not match, at this time, the infrared distance sensor 13 sends an electric signal to the controller, after the controller receives the electric signal, the electric push cylinder 12 is controlled to operate, the electric push cylinder 12 drives the adjusting scraper 10 to move upwards or downwards along the inner wall of the sleeve plate 9, the moving adjusting scraper 10 drives the infrared emitter 15 to move upwards or downwards, the infrared signal emitted by the infrared emitter 15 is received by the infrared receiver 14, the distance of the upward or downward movement of the infrared emitter 15 is measured through calculation, so that the accurate adjustment of the adjusting scraper 10 is realized, the distance between the bottom end of the adjusting scraper 10 and the lowest top sand layer is 0.3 mm, so that the situation that the adjusting scraper 10 contacts the uppermost sand layer during the linear movement of the adjusting scraper 10 is avoided.

[0023] When the electric push cylinder 12 operates, the spring 18 is deformed at this time, when the electric push cylinder 12 reversely operates, the spring 18 has a reset force, so as to assist the reset of the adjusting scraper 10.

[0024] Please refer to Figure 2 Two end plates 1 are fixedly installed above the conveying belt 6 and are provided with a back baffle 17.

[0025] In the embodiment, the setting of the back baffle 17 can avoid the flow of sand to the direction of the back baffle 17.

[0026] The above merely describes a preferred embodiment of the present application, and the protection scope of the present application is not limited thereto, and any skilled person in the art, according to the technical scheme and the inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. An adjustable powder spreading device for 3DP sand mould printers, comprising two end plates (1), characterised in that, Two said end plate (1) between both ends are rotatably mounted transmission roller (16), two said transmission roller (16) transmission connection between the conveyor belt (6), two said end plate (1) top welding a connecting bracket (4) is fixedly connected between two groups said No. 1 connecting bracket (4) sand hopper (5), the top of said end plate (1) and the outer wall of said sand hopper (5) is welded with No. 2 connecting bracket (7), the end of said No. 2 connecting bracket (7) away from said sand hopper (5) is fixedly installed with fixed scraper (8), the outer side of two said end plate (1) is fixedly installed with sleeve plate (9) through connecting frame, the sleeve plate (9) is installed with adjustable scraper mechanism, the outer side of said sleeve plate (9) and said adjustable scraper mechanism are distributed and installed with sensing mechanism.

2. The adjustable powder spreading device for 3DP sand mold printer according to claim 1, wherein, Said adjustable scraper mechanism includes the adjusting scraper (10) which is slidably connected to the inner cavity of the sleeve plate (9), the bottom end of the adjusting scraper (10) penetrates to the lower side of the sleeve plate (9), the top end of the sleeve plate (9) is provided with an electric push cylinder (12), the output end of the electric push cylinder (12) penetrates to the inner cavity of the sleeve plate (9), and the output end of the electric push cylinder (12) is fixedly connected with the top end of the adjusting scraper (10), the top end of the adjusting scraper (10) and the bottom end of the inner wall of the sleeve plate (9) abut against the spring (18), and the spring (18) is sleeved on the outer wall of the output shaft of the electric push cylinder (12).

3. The adjustable powder spreading device for 3DP sand mold printer according to claim 2, wherein, Said sensing mechanism includes an infrared distance sensor (13) and an infrared receiver (14) symmetrically arranged with the infrared distance sensor (13), the infrared receiver (14) is fixedly installed on the top end of the sleeve plate (9), the top end of the adjusting scraper (10) is fixedly installed with an infrared emitter (15), the infrared emitter (15) penetrates to the outside of the sleeve plate (9), the infrared receiver (14) and the infrared emitter (15) are aligned in the up-down direction, and the sleeve plate (9) is provided with a sliding groove (11) for the up-down movement of the infrared emitter (15).

4. The adjustable powder spreading device for 3DP sand mold printer according to claim 3, wherein, One said end plate (1) is provided with a rotary motor (2), the output end of the rotary motor (2) is provided with a speed reducer (3), and the output end of the speed reducer (3) penetrates the end plate (1) and is fixedly connected with one end of the transmission roller (16).

5. The adjustable powder spreading device for 3DP sand mold printer according to claim 4, wherein, Said two said end plate (1) between the top of said conveyor belt (6) is fixedly installed with backstop (17).

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