Blanking punch forming mechanism for steel drum sealer

Abstract

The utility model relates to the technical field of steel drum sealer blanking and punch forming, in particular to a steel drum sealer blanking and punch forming mechanism which facilitates storage and automatic feeding of master batch of a steel drum sealer, improves practicability and convenience, facilitates pressing of the master batch of the steel drum sealer and improves blanking quality. Comprising a blanking mechanism; the device further comprises a rotary feeding mechanism, a storage mechanism, an auxiliary feeding mechanism, a feeding mechanism and a pressing mechanism, the storage mechanism is installed on the side wall of the rotary feeding mechanism, the auxiliary feeding mechanism is installed at the bottom end of the rotary feeding mechanism, the feeding mechanism is installed at the top end of the rotary feeding mechanism, and the discharging mechanism is installed at the top end of the rotary feeding mechanism. And the pressing mechanism is mounted on the blanking mechanism, and the master batch of the steel drum sealer is stored through the storage mechanism.

Description

Technical Field

[0001] The utility model relates to the technical field of blanking and stamping forming of steel drum closures, in particular to a blanking and stamping forming mechanism for steel drum closures. Background Art

[0002] The steel drum closure is a device used to close the opening of the steel drum. Its main function is to ensure that the contents of the steel drum will not leak out, and to prevent external substances from entering the steel drum. It is an indispensable component in steel drum packaging and is of great significance for ensuring the sealing, safety and transportation convenience of the steel drum. Blanking is a material stamping process, and the process is to use a press to separate the required material from the plate parent material.

[0003] In the existing blanking stamping forming technology, for example, the existing technology with application number CN201710633437.2, including a die handle, an upper template, a pad, a new punch, a guide column, a unloading plate, a locating pin, a die, a die fixing plate, a lower template and a guide sleeve, etc., after using the new punch on the stamping die, the punch can provide fixed protection for the raw material during the stamping process, thereby preventing the raw material from shifting, and preventing the raw material from being wasted due to inaccurate hole position during stamping.

[0004] However, when blanking the steel drum closure, the prior art is not convenient for automatically loading the masterbatch, which reduces convenience and efficiency. In addition, the prior art is not convenient for auxiliary fixing of the masterbatch during blanking, and the quality of blanking cannot be guaranteed. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a steel drum closure blanking stamping and forming mechanism which is convenient for storing and automatically loading the masterbatch of the steel drum closure, thereby improving practicality and convenience, and is also convenient for pressing the masterbatch of the steel drum closure, thereby improving the quality of blanking.

[0006] The utility model discloses a blanking and stamping forming mechanism for a steel drum closure, comprising a blanking mechanism; further comprising a rotating feeding mechanism, a storage mechanism, an auxiliary feeding mechanism, a feeding mechanism and a pressing mechanism, wherein the storage mechanism is mounted on the side wall of the rotating feeding mechanism, the auxiliary feeding mechanism is mounted on the bottom end of the rotating feeding mechanism, the feeding mechanism is mounted on the top end of the rotating feeding mechanism, the blanking mechanism is mounted on the top end of the rotating feeding mechanism, and the pressing mechanism is mounted on the blanking mechanism, the mother material of the steel drum closure is stored by the storage mechanism, the rotating feeding mechanism feeds the mother material of the steel drum closure, and the auxiliary feeding mechanism is mounted on the bottom end of the rotating feeding mechanism. The auxiliary feeding mechanism loads the masterbatch of the steel drum closure, the blanking mechanism blanks and stores the masterbatch of the steel drum closure, and the pressing mechanism facilitates pressing the masterbatch of the steel drum closure; the masterbatch of the steel drum closure is stored through the storage mechanism, the loading mechanism is rotated to load the masterbatch of the steel drum closure, the auxiliary feeding mechanism assists the feeding mechanism to load the masterbatch of the steel drum closure, the blanking mechanism blanks and stores the masterbatch of the steel drum closure, and the pressing mechanism facilitates pressing the masterbatch of the steel drum closure, which is convenient for fixing the masterbatch of the steel drum closure and improving the quality of blanking.

[0007] Preferably, the rotating feeding mechanism includes a base plate, a feeding gear, a driving gear and a driving motor. The feeding gear is rotatably installed on the top of the base plate, a feeding trough is provided on the feeding gear, the driving gear is rotatably installed on the top of the base plate, the driving gear is meshed with the feeding gear, the driving motor is installed at the bottom end of the base plate, and the output end of the driving motor is connected with the driving gear; when the mother material of the steel barrel closure is to be fed, the driving gear is driven to rotate by turning on the driving motor, and then the feeding gear is driven to rotate through the meshing relationship, so that the mother material of the steel barrel closure in the storage mechanism falls into the feeding trough, and then the mother material of the steel barrel closure in the feeding trough is transported to the auxiliary feeding mechanism through the rotation of the feeding gear, and the auxiliary feeding mechanism pushes the mother material of the steel barrel closure to be fed.

[0008] Preferably, the material storage mechanism includes a mounting bracket and a material storage box, the material storage box is mounted on the side wall of the base plate through the mounting bracket, and the material storage box is located at the top of the loading gear disc; first, the masterbatch of the steel drum closure is added into the material storage box, and the masterbatch of the steel drum closure is stored through the material storage box.

[0009] Preferably, the auxiliary feeding mechanism includes a sliding sleeve, a sliding block, a sliding drive block and a cylinder, a feeding port is provided on the bottom plate, the sliding sleeve is installed on the bottom end of the bottom plate, the sliding sleeve is located at the feeding port of the bottom plate, the sliding block is slidably installed in the sliding sleeve, the bottom surface of the sliding block is an inclined surface, a sliding groove is provided on the bottom surface of the sliding block, the sliding drive block is slidably installed on the bottom surface of the sliding sleeve, the top surface of the sliding drive block is an inclined surface, the top surface of the sliding drive block is slidably installed in the bottom surface sliding groove of the sliding block, and the cylinder is installed on the sliding On the side wall of the sleeve, the movable end of the cylinder is connected to the sliding drive block; when the master material of the steel drum closure is conveyed to the loading port of the bottom plate through the rotation of the loading gear disc, the master material of the steel drum closure falls to the top of the sliding block, and the sliding drive block is driven to slide on the bottom surface of the sliding sleeve by turning on the cylinder, and then the sliding block and the inclined surface of the sliding drive block slide relative to each other, so that the sliding block slides in the sliding sleeve, and then the master material of the steel drum closure is lifted up, and then the master material of the steel drum closure is fed through the feeding mechanism.

[0010] Preferably, the feeding mechanism includes a cylinder seat and a feeding cylinder. The cylinder seat passes through the loading gear plate and is installed on the top of the base plate. The loading gear plate rotates relative to the cylinder seat. The feeding cylinder is installed on the cylinder seat. A push plate is provided at the movable end of the feeding cylinder. By opening the feeding cylinder and pushing the push plate to move, the mother material of the steel barrel closure at the top of the sliding block is pushed to the blanking mechanism for blanking processing.

[0011] Preferably, the blanking mechanism includes a mounting frame, a blanking cylinder, a blanking head and a blanking base. The mounting frame is mounted on the top of the base plate, the blanking cylinder is mounted on the mounting frame, the blanking head is mounted on the movable end of the blanking cylinder, the blanking base is mounted on the top of the base plate, and a discharge box is provided at the bottom end of the base plate; the blanking cylinder is opened to drive the blanking head to cooperate with the blanking base to blank the mother material of the steel barrel closure, so that the steel barrel closure falls into the discharge box for storage.

[0012] Preferably, the pressing mechanism includes a mounting plate, a sliding rod, a pressing plate, a limit plate and a spring, the mounting plate is mounted on the movable end of the blanking cylinder, the sliding rod is slidably mounted on the mounting plate, the pressing plate is mounted on the bottom end of the sliding rod, the limit plate is mounted on the top end of the sliding rod, one end of the spring is mounted on the top end of the mounting plate, and the other end of the spring is mounted on the bottom end of the limit plate; when the blanking cylinder drives the blanking head to descend to blank the mother material of the steel barrel closure, the mother material of the steel barrel closure is pressed by the pressing plate, and then the sliding rod slides on the mounting plate, thereby driving the pressing plate to press the mother material of the steel barrel closure through the elasticity of the spring, thereby improving the quality of blanking.

[0013] Compared with the prior art, the utility model has the following beneficial effects: the mother material of the steel drum closure is stored by the storage mechanism, the mother material of the steel drum closure is loaded by the rotating loading mechanism, the mother material of the steel drum closure is loaded by the auxiliary feeding mechanism, the mother material of the steel drum closure is dropped and stored by the blanking mechanism, the pressing mechanism is convenient for pressing the mother material of the steel drum closure, it is convenient for fixing the mother material of the steel drum closure, and the quality of the blanking is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a first axonometric structural schematic diagram of the utility model;

[0015] Figure 2 It is a second axonometric structural schematic diagram of the utility model;

[0016] Figure 3 It is a third axonometric structural schematic diagram of the utility model;

[0017] Figure 4 It is a front cross-sectional structural schematic diagram of the utility model;

[0018] Figure 5 It is a front structural schematic diagram of the utility model;

[0019] Markings in the attached drawings: 01, rotating feeding mechanism; 11, bottom plate; 12, feeding gear disc; 13, feeding trough; 14, driving gear; 15, driving motor; 02, storage mechanism; 21, mounting bracket; 22, storage box; 03, auxiliary feeding mechanism; 31, sliding sleeve; 32, sliding block; 33, sliding drive block; 34, cylinder; 04, feeding mechanism; 41, cylinder seat; 42, feeding cylinder; 05, blanking mechanism; 51, mounting bracket; 52, blanking cylinder; 53, blanking head; 54, blanking base; 06, pressing mechanism; 61, mounting plate; 62, sliding rod; 63, pressing plate; 64, limit plate; 65, spring. DETAILED DESCRIPTION

[0020] In order to facilitate the understanding of the utility model, the utility model will be described more comprehensively below with reference to the relevant drawings. The utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0021] Example 1

[0022] like Figures 1 to 5As shown, it includes a blanking mechanism 05, a rotating feeding mechanism 01, a storage mechanism 02, an auxiliary feeding mechanism 03, a feeding mechanism 04 and a pressing mechanism 06, wherein the storage mechanism 02 is mounted on the side wall of the rotating feeding mechanism 01, the auxiliary feeding mechanism 03 is mounted on the bottom end of the rotating feeding mechanism 01, the feeding mechanism 04 is mounted on the top end of the rotating feeding mechanism 01, the blanking mechanism 05 is mounted on the top end of the rotating feeding mechanism 01, and the pressing mechanism 06 is mounted on the blanking mechanism 05;

[0023] The masterbatch of the steel drum closure is stored by the storage mechanism 02, the masterbatch of the steel drum closure is loaded by the rotating loading mechanism 01, the masterbatch of the steel drum closure is loaded by the auxiliary feeding mechanism 03 and the auxiliary feeding mechanism 04, the masterbatch of the steel drum closure is dropped and stored by the blanking mechanism 05, and the pressing mechanism 06 is convenient for pressing the masterbatch of the steel drum closure;

[0024] The rotating feeding mechanism 01 includes a bottom plate 11, a feeding toothed disc 12, a driving gear 14 and a driving motor 15. The feeding toothed disc 12 is rotatably mounted on the top of the bottom plate 11. A feeding trough 13 is provided on the feeding toothed disc 12. The driving gear 14 is rotatably mounted on the top of the bottom plate 11. The driving gear 14 is meshed with the feeding toothed disc 12. The driving motor 15 is mounted on the bottom end of the bottom plate 11. The output end of the driving motor 15 is connected to the driving gear 14.

[0025] The material storage mechanism 02 includes a mounting bracket 21 and a material storage box 22. The material storage box 22 is mounted on the side wall of the bottom plate 11 through the mounting bracket 21. The material storage box 22 is located at the top of the feeding gear disc 12.

[0026] The auxiliary feeding mechanism 03 includes a sliding sleeve 31, a sliding block 32, a sliding drive block 33 and a cylinder 34. A loading port is provided on the bottom plate 11. The sliding sleeve 31 is installed at the bottom end of the bottom plate 11. The sliding sleeve 31 is located at the loading port of the bottom plate 11. The sliding block 32 is slidably installed in the sliding sleeve 31. The bottom surface of the sliding block 32 is an inclined surface. A sliding groove is provided on the bottom surface of the sliding block 32. The sliding drive block 33 is slidably installed on the bottom surface of the sliding sleeve 31. The top surface of the sliding drive block 33 is an inclined surface. The top surface of the sliding drive block 33 is slidably installed in the bottom surface sliding groove of the sliding block 32. The cylinder 34 is installed on the side wall of the sliding sleeve 31. The movable end of the cylinder 34 is connected to the sliding drive block 33.

[0027] The feeding mechanism 04 includes a cylinder seat 41 and a feeding cylinder 42. The cylinder seat 41 penetrates the feeding toothed disc 12 and is installed on the top of the bottom plate 11. The feeding toothed disc 12 rotates relative to the cylinder seat 41. The feeding cylinder 42 is installed on the cylinder seat 41. A push plate is provided at the movable end of the feeding cylinder 42.

[0028] First, add the masterbatch of the steel drum closure into the storage box 22, and store the masterbatch of the steel drum closure through the storage box 22. When the masterbatch of the steel drum closure is to be loaded, the driving motor 15 is turned on to drive the driving gear 14 to rotate, and then the loading gear disc 12 is driven to rotate through the meshing relationship, so that the masterbatch of the steel drum closure in the storage box 22 falls into the loading trough 13. When the masterbatch of the steel drum closure is conveyed to the loading port of the bottom plate 11 through the rotation of the loading gear disc 12, the masterbatch of the steel drum closure falls to the top of the sliding block 32, and the sliding block 32 is driven by turning on the cylinder 34. The driving block 33 slides on the bottom surface of the sliding sleeve 31, and then the sliding block 32 and the inclined surface of the sliding driving block 33 slide relative to each other, so that the sliding block 32 slides in the sliding sleeve 31, and then the master material of the steel barrel closure is lifted, and the feeding cylinder 42 is opened to push the push plate to move the master material of the steel barrel closure at the top of the sliding block 32 to the blanking mechanism 05 for blanking processing. The blanking mechanism 05 blanks and stores the master material of the steel barrel closure, and the pressing mechanism 06 is convenient for pressing the master material of the steel barrel closure, which is convenient for fixing the master material of the steel barrel closure and improving the quality of blanking;

[0029] Example 2

[0030] like Figure 2 and Figure 4 As shown, it includes a blanking mechanism 05, a rotating feeding mechanism 01, a storage mechanism 02, an auxiliary feeding mechanism 03, a feeding mechanism 04 and a pressing mechanism 06, wherein the storage mechanism 02 is mounted on the side wall of the rotating feeding mechanism 01, the auxiliary feeding mechanism 03 is mounted on the bottom end of the rotating feeding mechanism 01, the feeding mechanism 04 is mounted on the top end of the rotating feeding mechanism 01, the blanking mechanism 05 is mounted on the top end of the rotating feeding mechanism 01, and the pressing mechanism 06 is mounted on the blanking mechanism 05;

[0031] The masterbatch of the steel drum closure is stored by the storage mechanism 02, the masterbatch of the steel drum closure is loaded by the rotating loading mechanism 01, the masterbatch of the steel drum closure is loaded by the auxiliary feeding mechanism 03 and the auxiliary feeding mechanism 04, the masterbatch of the steel drum closure is dropped and stored by the blanking mechanism 05, and the pressing mechanism 06 is convenient for pressing the masterbatch of the steel drum closure;

[0032] The blanking mechanism 05 includes a mounting frame 51, a blanking cylinder 52, a blanking head 53 and a blanking base 54. The mounting frame 51 is mounted on the top of the bottom plate 11, the blanking cylinder 52 is mounted on the mounting frame 51, the blanking head 53 is mounted on the movable end of the blanking cylinder 52, the blanking base 54 is mounted on the top of the bottom plate 11, and a discharge box is provided at the bottom end of the bottom plate 11;

[0033] The pressing mechanism 06 includes a mounting plate 61, a sliding rod 62, a pressing plate 63, a limiting plate 64 and a spring 65. The mounting plate 61 is mounted on the movable end of the blanking cylinder 52, the sliding rod 62 is slidably mounted on the mounting plate 61, the pressing plate 63 is mounted on the bottom end of the sliding rod 62, the limiting plate 64 is mounted on the top end of the sliding rod 62, one end of the spring 65 is mounted on the top end of the mounting plate 61, and the other end of the spring 65 is mounted on the bottom end of the limiting plate 64;

[0034] The mother material of the steel barrel closure is stored through the storage mechanism 02, the feeding mechanism 01 is rotated to feed the mother material of the steel barrel closure, the auxiliary feeding mechanism 03 and the auxiliary feeding mechanism 04 are used to feed the mother material of the steel barrel closure, and the mother material of the steel barrel closure is dropped by opening the dropping cylinder 52 to drive the dropping head 53 to cooperate with the dropping base 54, so that the steel barrel closure falls into the discharge box for storage. When the dropping cylinder 52 drives the dropping head 53 to descend to drop the mother material of the steel barrel closure, the mother material of the steel barrel closure is pressed by the pressing plate 63, so that the sliding rod 62 slides on the mounting plate 61, thereby driving the pressing plate 63 to press the mother material of the steel barrel closure through the elasticity of the spring 65, thereby improving the quality of the dropping.

[0035] like Figures 1 to 5 As shown, the utility model is a blanking and stamping forming mechanism for a steel barrel closure. When it is working, the masterbatch of the steel barrel closure is first added into the storage box 22, and the masterbatch of the steel barrel closure is stored through the storage box 22. When the masterbatch of the steel barrel closure is to be loaded, the driving motor 15 is turned on to drive the driving gear 14 to rotate, and then the loading gear plate 12 is driven to rotate through the meshing relationship, so that the masterbatch of the steel barrel closure in the storage box 22 falls into the loading trough 13. When the masterbatch of the steel barrel closure is conveyed to the loading port of the bottom plate 11 by the rotation of the loading gear plate 12, the masterbatch of the steel barrel closure falls to the top of the sliding block 32, and the sliding drive block 33 is driven to slide on the bottom surface of the sliding sleeve 31 by turning on the cylinder 34, and then the sliding block 32 and the sliding drive block 33 are driven to rotate. The inclined surfaces slide relative to each other, so that the sliding block 32 slides in the sliding sleeve 31, and then the mother material of the steel barrel closure is lifted up, and by opening the feeding cylinder 42, the push plate is pushed to move to push the mother material of the steel barrel closure at the top of the sliding block 32 to the blanking mechanism 05 for blanking processing, and by opening the blanking cylinder 52, the blanking head 53 is driven to cooperate with the blanking base 54 to blank the mother material of the steel barrel closure, so that the steel barrel closure falls into the discharge box for storage. When the blanking cylinder 52 drives the blanking head 53 to descend to blank the mother material of the steel barrel closure, the pressing plate 63 is used to press the mother material of the steel barrel closure, so that the sliding rod 62 slides on the mounting plate 61, thereby driving the pressing plate 63 to press the mother material of the steel barrel closure through the elasticity of the spring 65, thereby improving the quality of blanking.

[0036] The drive motor 15, cylinder 34, feed cylinder 42 and blanking cylinder 52 of the utility model are purchased on the market, and technicians in the industry only need to install and operate them according to the accompanying instruction manuals without the need for creative work by technicians in this field.

[0037] The main functions realized by the utility model are: in the process of blanking and stamping of the steel drum closure, it is convenient to store and automatically load the masterbatch of the steel drum closure, thereby improving practicality and convenience, and it is also convenient to press the masterbatch of the steel drum closure, thereby improving the quality of blanking.

[0038] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A blanking and stamping mechanism for a steel drum closure, comprising a blanking mechanism (05); characterized in that: It also includes a rotating loading mechanism (01), a storage mechanism (02), an auxiliary feeding mechanism (03), a feeding mechanism (04) and a pressing mechanism (06), wherein the storage mechanism (02) is mounted on the side wall of the rotating loading mechanism (01), the auxiliary feeding mechanism (03) is mounted on the bottom end of the rotating loading mechanism (01), the feeding mechanism (04) is mounted on the top end of the rotating loading mechanism (01), the blanking mechanism (05) is mounted on the top end of the rotating loading mechanism (01), and the pressing mechanism (06) is mounted on the blanking mechanism (05); The material storage mechanism (02) stores the masterbatch of the steel drum closure, the rotating feeding mechanism (01) feeds the masterbatch of the steel drum closure, the auxiliary feeding mechanism (03) and the auxiliary feeding mechanism (04) feed the masterbatch of the steel drum closure, the blanking mechanism (05) blanks and stores the masterbatch of the steel drum closure, and the pressing mechanism (06) facilitates pressing the masterbatch of the steel drum closure.

2. A blanking and stamping forming mechanism for a steel drum closure as claimed in claim 1, characterized in that: The rotary feeding mechanism (01) comprises a base plate (11), a feeding toothed disc (12), a driving gear (14) and a driving motor (15); the feeding toothed disc (12) is rotatably mounted on the top of the base plate (11); a feeding trough (13) is provided on the feeding toothed disc (12); the driving gear (14) is rotatably mounted on the top of the base plate (11); the driving gear (14) is meshed with the feeding toothed disc (12); the driving motor (15) is mounted on the bottom of the base plate (11); and the output end of the driving motor (15) is connected to the driving gear (14).

3. A blanking and stamping forming mechanism for a steel drum closure as claimed in claim 2, characterized in that: The material storage mechanism (02) comprises a mounting bracket (21) and a material storage box (22). The material storage box (22) is mounted on the side wall of the bottom plate (11) through the mounting bracket (21). The material storage box (22) is located at the top end of the feeding gear disc (12).

4. A blanking and stamping forming mechanism for a steel drum closure as claimed in claim 2, characterized in that: The auxiliary feeding mechanism (03) comprises a sliding sleeve (31), a sliding block (32), a sliding driving block (33) and a cylinder (34). A loading port is provided on the bottom plate (11). The sliding sleeve (31) is mounted at the bottom end of the bottom plate (11). The sliding sleeve (31) is located at the loading port of the bottom plate (11). The sliding block (32) is slidably mounted in the sliding sleeve (31). The bottom surface of the sliding block (32) is an inclined surface. A sliding groove is provided on the bottom surface of the sliding block (32). The sliding driving block (33) is slidably mounted on the bottom surface of the sliding sleeve (31). The top surface of the sliding driving block (33) is an inclined surface. The top surface of the sliding driving block (33) is slidably mounted in the sliding groove on the bottom surface of the sliding block (32). The cylinder (34) is mounted on the side wall of the sliding sleeve (31). The movable end of the cylinder (34) is connected to the sliding driving block (33).

5. A blanking and stamping forming mechanism for a steel drum closure as claimed in claim 2, characterized in that: The feeding mechanism (04) comprises a cylinder seat (41) and a feeding cylinder (42); the cylinder seat (41) penetrates the feeding toothed disc (12) and is installed on the top of the bottom plate (11); the feeding toothed disc (12) rotates relative to the cylinder seat (41); the feeding cylinder (42) is installed on the cylinder seat (41); and a push plate is provided at the movable end of the feeding cylinder (42).

6. A blanking and stamping forming mechanism for a steel drum closure as claimed in claim 2, characterized in that: The blanking mechanism (05) comprises a mounting frame (51), a blanking cylinder (52), a blanking head (53) and a blanking base (54); the mounting frame (51) is mounted on the top of the base plate (11); the blanking cylinder (52) is mounted on the mounting frame (51); the blanking head (53) is mounted on the movable end of the blanking cylinder (52); the blanking base (54) is mounted on the top of the base plate (11); and a material discharge box is provided at the bottom of the base plate (11).

7. A blanking and stamping mechanism for a steel drum closure as claimed in claim 6, characterized in that: The pressing mechanism (06) comprises a mounting plate (61), a sliding rod (62), a pressing plate (63), a limiting plate (64) and a spring (65); the mounting plate (61) is mounted on the movable end of the blanking cylinder (52); the sliding rod (62) is slidably mounted on the mounting plate (61); the pressing plate (63) is mounted on the bottom end of the sliding rod (62); the limiting plate (64) is mounted on the top end of the sliding rod (62); one end of the spring (65) is mounted on the top end of the mounting plate (61); and the other end of the spring (65) is mounted on the bottom end of the limiting plate (64).

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